M103 eha valve

M103 eha valve. What is more important than the actual values is the 0. I've taken my 300E up to 120mph ! quite the rush for a lad in Wisconsin. If you notice a drop of pressure after the car has been sitting for a few minutes, you could have a bad check valve allowing fuel to flow backwards. ). Ergo, NEVER get a wrecking yard EHA as it will not work. I was thinking of going to the junk yard and getting the rocker arms off a 16v and seeing how hard it would be to adapt them on the m103. 3 mm that gets into either one of the FD‘s EHA ports will highly likely obstruct the orifice. This video is about Electric actuator adjustmentsEvery Tuesday and Saturday, we strive to provide you the best in the business. None of my usual parts sources were much help (understandably wouldn't separate from the fuel distributor). This is off our 1992 W124 300E, during the 80's and 90's many european cars had one of these expensive parts, when they fail they start leaking fuel and can Jan 23, 2018 · Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" #17 Mar 13, 2021 · (The PO had replaced the harmonic balancer, EHA valve, performed a transmission fluid change, and replaced the drive belt all within the prior 7,000 miles. Adjusted half a turn more rich, and the car ran ok, but I could tell there was a power issue at higher speeds. Fuel pressure regulator, Control Valve EHA Valve, Fuel Injection Electro-Hydraulic Actuator) 1986 Mercedes-Benz 300 Series - 300E - 124. This isn't going to accomplish anything until you get all the rotten gas out and clean the FI system, attempt a baseline by replacing parts like plugs, wires, distributor, rotor etc. The second is with the valve open to the cold start fitting. The car was an 88, a medium blue color with java leather. Check the two electrical connections for the valve. Oct 29, 2021 · Check valve on fuel pump: Fairly easy to replace. I would advise you do NOT make any adjustments to that brand new EHA until you've installed and ran it as well checking duty cycle a few times. The little o-ring is there only for keep the setting position of EHA. Jump to Latest Follow 2K views This product was the genuine Bosch EHA valve. The EHA also has an electromagnetic ability to decrease the pressure differential between the upper and lower chambers by varying the current through its internal electromagnet. 4 bar difference. I've got a 1991 300E M103 3. Since I’ve had Jun 30, 2009 · The EHA is also expensive but super easy to replace. Only issue will be setting the chamber pressures, which is a fine balancing act of the EHA and other sensors. Brand new OEM BOSCH part with full 1 year warranty. The cold start valve can. Valve - Bosch 3. I appreciate the comments and thoughts from you very experienced owners. Nov 6, 2010 · 2. Feb 24, 2018 · I had the dreaded low idle and found multiple problems. I will go through the EHA test, but was hoping to have a clean/tested system first, I see the EHA as the last thing to work on, even after the O2 sensor, which I need to take out and clean and/or replace. I've been reading for the past 6 months and have diagnosed a leaky EHA valve, adjusted air/fuel mixture and learned how to start in first gear off the line. Jul 30, 2004 · I've been troubleshooting a hard start problem. The EHA is very sensitive to the slightest adjustment. The iac test fine with current, voltage, resistance. Even the injection system is pretty stupid simple, except the computer controls for idle and EHA. Wondering can anyone help. The ideal readings are 6. The EHA acts as a controlled leak depending on current. The E26 displaces 2. Also as already stated EHA valve! Air leaks (check with smoke test) and worn injectors. The armature and the valve piston slide lengthwise on their axis to open and close the air aperture. The engine has the lightweight cast iron cylinder block, aluminum cylinder head with two valves per cylinder, a single overhead camshaft, and hydraulic lifters/tappets. The EHa cannot leak directly into the inlet manifold. 6 liters, while the E30 displaces 3. Registered User : Join Date: Feb 2000. You will need to remove the air cleaner to see it. Thread: EHA valve M103. If you would be kind to support the channel you can do it via this linkhttps://www. I’ve had my car for about 10 years. D. This is caused by leakage over time. But: Will clockwise (tiny increments) increase or decrease the pressure differential between the upper and lower chambers? Jun 4, 2009 · EHA Adjustment M103 EHA and CO Adjustment Issues (KE Jetronic Experts Please) - PeachParts Mercedes ShopForum EHA Valve Mercedes 300E EHA Valve - 300E E. H. Oct 11, 2002 · PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help: M103 EHA/Lambda Adjustment HELP. I also read the thread that was linked about m103 issues and will be double checking that my injectors arent the original silver ones. 4 bar recommended difference Oct 28, 2015 · So i have a questions related to the M103 - recently I had the EHA valve replaced on my W107 300SL and the car is running better than ever - as long as i am not cruising around 65MPH - around that speed, if i try and accelerate there is a dead spot in the pedal where nothing happens unless i floor the pedal. Jun 13, 2021 · Easiest thing to check for high idle are the idle control valve hoses, the rubber gets hard and they don't seal. com/fix_your_mercedes/Link to my fb grouphttps://www Jul 29, 2022 · hey man, thanks for the tips ! yes, I am worried about leaning out and knocking, was planning to work on adjusting the kjet to push the proper amount, Im already using a 3L EHA valve (mine was leaking) so Im running rich right now )) but I know there is far more to do there Feb 25, 2009 · The EHA on the fuel distributor modulates the fuel pressure between the upper and lower chamber if the FD, under control of the ECU. i imagine, without looking under the hood, there's another problem. 6-liter version (the M103 E26 ). the later M104 is a much more modified unit than the earlier one. Often I see, for instance, EHA O-ring replacement recommendations posted here at BW without mentioning this precaution. Jul 11, 2013 · - All breather hoses from valve cover replaced - New Valve Cover Seal - New rubber boot of Air flow meter - Replaced rubber between FD and air flow meter - All three temp sensors replaced - Many rubber connection and vacuum lines replaced - Fuel filter in FD replaced - O rings at EHA valve replaced - All injector o-rings and clip holders replaced Mar 4, 2023 · You guys are all awesome! I will be checking for vacuum leaks as well as a leak in my EHA valve when I get home from work. Jan 14, 2006 · Make sure the idle air valve is not sticky, as well as the management system knows that the engine is at idle. Nov 23, 2017 · The EHA valve is located on the backside of the fuel distributor. Sep 7, 2015 · 2) EHA connected (diagram #2 without ground wire) 3) EHA connected and male part of the o2 sensor connected to ground (diagram #2) 4) EHA disconnected (diagram #2 without ground wire) 5) EHA disconnected and engine speed risen to ~ 2500 RPM (diagram #2 without ground wire) H. Dec 16, 2009 · The electrohydraulic actuator consist of a valve placed on a reed in between magnets. The revs on warm idle are at 500 RPM. That tool can be purchased for ~$80. I'm hoping someone can help me with a persistant hot start problem on my 1988 300E, W124 with the M103 gas engine. Mar 30, 2022 · Hi, I have a W126 300SE M103 engine (with no oxygen sensor and cat). Glue is not going to repair the leak, and the leaking gas could start an under-hood fire. View Single Post #5 M103 - SOHC "Fräulein" Nov 20, 2008 · The kit was well engineered and solved the enrichment problem not by modifying the signal to the EHA like Mosselman did, but by adding two additional injectors mounted in a casting that replaces the rubber boot between the air valve assembly and the throttle body. The flange that I made to the cis unit is pretty rigged up right now (yucky welds) so once I get some pipe bent to the right shape and redo the flange, I should get some better flow. Same deal. The W124 suffers from the biodegradable wiring harness. May 8, 2016 · Hi Everyone. All the specialists tell to change the EHA because is too old and is damage inside. Dec 12, 2012 · There's a few things to go wrong,not sure about m102? but in our m103 motors,fuel pumps,accumulator,filter,fuel pressure regulator,leaking injectors,system keeps pressure in it for easy restart once warmed up,sometimes 1 or 2 injectors loose their seal and drip gas onto the piston ,flooding the engine making restart hard until it burns off,best thing to do is run a fuel pressure test on the Aug 4, 2021 · The EHA links the upper and lower chambers and "sets" the pressure differential mechanically like a FPR. Jun 12, 2013 · When I downloaded the directions, it looked pretty straight forward. Common Characteristics: EH valves are single-port, high-pressure, globe-style valves with metal seats, cage guiding, and push- down- to- close valve plug action. 7K views 9 months ago. if it's better, then you DO have an electrical/fuel control problem-i doubt it. Only in May 30, 2010 · This provides the duty cycle that the fuel injection ECU is using when it controls the EHA valve. I cannot identify if its an Ignition, Fuel Jul 30, 2018 · Leaking EHA valve Jump to Latest 16K views 43 replies 8 participants last post by 89benz300se Aug 18, 2018 Feb 24, 2011 · The EHA is adjustable but only affects the lower part of the fuel distributor. May 28, 2001 · Are EHA valves similar to water pumps in that they will leak through pre-drilled holes when the part fails? There are two holes in the EHA valve that appear to be leaking gas. Think of it like building a valve body on a transkeep everything in order, clean, and do it when awake. Oct 10, 2002 · PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help: M103 EHA/Lambda Adjustment HELP Jan 31, 2005 · Actually, I wasn't aware that the EHA is mechanically adjustable, so I should thow a fuel mixture gauge on there and adjust as neccassary, thanks for the insight. They might also be the cause of the leak. Both the M103 E26 and E30 are very similar motors, most distinguishable by their displacement. +20 C = 2. Which demands the attentiveness and the presence of the certain knowledges. Apr 1, 2023 · I discovered that my EHA valve is leaking (somewhat choppy, idle, hard hot start, and fuel smell). 3. 6. 0 bar with the valve closed and 6. Mercedes EHA valve - Followup on repairing the lame acceleration. Sep 1, 2008 · the M103 is a 12 valve unit. My M117 fires right up with minimal cranking but also has half the Mar 18, 2012 · Also, would disconnecting the EHA just to be able to drive the car be safe for the car if I try to tune the lambda to 50% with it disconnected? The only other thing I can think of is if something is triggering the cold start valve or the cold start valve is leaking or the CIS unit is leaking out the bottom. 0 liter version is nothing but a M103 with a new cylinder head. 4K subscribers. Plus - EHA valve adjustment (under the blanking plug, on rear of removed item) is easy to do. View Single Post #16 11-30-2017, 08:27 AM Mike Murrell. Cold start still exhibits longer cranking than I believe to be necessary, but could be perfectly normal for the M103 for all I know. EHA unplugged, car running, and readings were roughly 5. Spray carb choke on all the lines and if you see change in idle then you've found the leak. paypal. 983; Feb 16, 2023 · It might be the fuel distributor. 21. 6 mm larger bore and identical stroke. This photo illustrates a degraded harness; these wires have lost their sheaths and are touching raw wire to wire. It made a huge difference. This in turn controls the amount of fuel in the lower chambers of the fuel May 24, 2018 · Testing for problems with the EHA valve requires specialized knowledge and equipment for working with Mercedes vehicles. 040 So, my laundry list: 1) clean idle control valve (icv--maybe bad) 2) clean o2 sensor (mpg is ok, o2 probably good) 3) adjust EHA (or fix vacuum leak) Aug 30, 2012 · N. PeachParts is NOT affiliated, sponsored nor authorized by Daimler AG. Mar 20, 2021 · EHA Valve. Mar 20, 2005 · “The EHA is the final servo device for applying the corrections intended by the control system. I could actually give it a bit more to make it a bit more Sep 28, 2004 · There is an adjustment to the electro-hydraulic actuator (EHA) that hangs off the back side of the fuel distributor. I have a 1989 260E. The EHA valve adjusts the control pressure in the fuel distributor and it can be made to cut the fuel. B. Aug 31, 2007 · Newbie here. Adjustment of the KE-Jetronic, and in particular EHA - is very difficult process. The O2 sensor tells the ECU just how much to modulate the EHA. The M103 series also includes the 2. The fuel pump relay has a processor inside to turn on the pump and activate the cold start valve. I had the very common issue of my EHA valve leaking, as I was smelling gas in the fuel bay for the last month. But yes this is for my 89 420SEL. May 9, 2015 · There is a boat load of 124 cars at the local pick a part I will grab a couple of EHA's temp sensors,and cold start valves for $5 bucks you cant go wrong ,these are very pricey items 88 W124 3. instagram. Dec 5, 2021 · Wondering if an EHA valve from 190e (p/n: 000 070 40 62) will work on a 300e. All forms of enrichment are accomplished by increasing the differential pressure within the fuel distributor. Mar 1, 2011 · All of the electrical components in the fuel system are on the same on your motor as in any 12V M103 from 86-92. Feb 21, 2008 · Re the old post about the EHA valve, I also had a leak develop over the last few months. EHA valves are angle versions of EH valves EHD/EHAD: Uses a balanced valve plug(1) with graphite valve plug piston rings; also, see tables 4 and 5 EHS/EHAS: Uses an unbalanced valve plug. (Hint) If the EHA is leaking, it generally leaks from the two rubber washers between it and the FD or the EHA body maybe cracked. As I see it, that electromagnet works against the internal spring. The O2 sensor must be warmed up to provide good info and then the computer goes "closed loop" which just means that it is using the O2 sensor info to control fuel delivery. The M103 does have deceleration fuel shutoff. Through the course of regular maintenance, I have replaced the fuel pump, accumulator, filter, Feb 7, 2022 · -distributor cap, rotor, spark plugs, wires, ignition coil, EHA, idle set by duty cycle, fuel filter, fuel pump, fuel injectors, air flow plate adjusted, air filter, all vacuum hoses and connections replaced, 4-prong thermostat sensor at rear top of engine, thermo-vacuum valve, head gasket, OVP, fuel relay, idle control valve, hoses for ICV May 26, 2016 · Sorry I get confused with my 89 300E. So, I parted with about €360 for the injectors and, with the seals and guides, €500 in total. I may turn it 1/4 more and see what happens, certainly can't hurt. Give the valve a shake with some cleaner in it as well; you should be able to shake the small valve inside to clear out some more gunk. It is a single overhead cam design with 2 valves per cylinder. Nov 8, 2021 · #fixyourmercedes##mercdeskejetronic##ehaadjustingscrew#Link to my instagram profilehttps://www. Tags 190e eha m103 mixture. Apr 3, 2011 · It's fuel distributors and EHA valves that are the weak link and common problem. Uneven idle is usually down to the ignition system requiring a service. I have heard that this gap is the normal stopping point of the valve. Dilanja, Retard the timing a bit, if you gonna use 95RON. You are looking at a faulty potentiometer or that throttle switch. Dec 21, 2016 · Jim, you definitely need to replace the EHA Valve once the body has cracked. Mercedes part# 000 070 39 62, check fit below. Jun 27, 2017 · My 88 300E automatic will surge from 1000 to 1400 rpm and back again a couple of times if I take my foot off the gas and coast under 40 mph. This is the gizmo that takes the commands from the ECU and adjusts the fuel distributor pressure. 6 mm Current at actuator (only ECE/RÜF): ignition "ON" = + 70 mA idle, coolant temp. If you stick your head in there and smell gasoline in the area of the EHA, it's most likely the culprit for the gas smell at least. The supplied control was a bit antiquated using Hobbs switches and crude electronics. Reading the duty cycle from a digital meter (DMM) is straightforward. Mar 8, 2013 · This is a picture of 91 300te m103 idle air control valve off the car with no voltage applied. Jul 29, 2014 · While you have the air filter housing off, check the EHA valve for gas leaks. Earlier this year I found a beautiful 300SE is a local junkyard. 5 mA to -5. Aug 4, 2017 · After much speculation, I went ahead and tore out the fuel distributor (old diaphragm had multiple needle holes in it and was well deformed), ordered a rebuild kit, put the distributor through ultrasonic cleaning, changed out the 6 metering o-rings, cleaned the barrel filter, regreased the plunger with WD40, new barrel o rings, new EHA valve Jul 11, 2022 · Hi. 45bar. Jul 3, 2024 · Yes the idle will drop when drive or reverse is engaged. I memory how much rotation of the 2 mm allen key was original( 27 complete rotations). Duty cycle is 50% +/- 5% at idle, car starts fine every time with 2-3 seconds of cranking in the hot or cold weather. However there are two O Rings that act as gasgets for the valve. There are several things that can go wrong with the EHA valve, and depending on what Jun 16, 2015 · In #10 the drawings are of an axial idle air valve. There is an electromagnet placed inside that either decreases or increases the magnetic field. Mar 16, 2010 · have read a EHA valve can wear out internally and cause idle problems,it controls pressures in Fuel dist ,the EHA was replaced year ago? with a used one,this week will be buying a new $300 EHA so I can rule it out. 3 mpg 70% city 30% highway driving conservatively. Am going to make a manual with pipe hose and a ball valve to see what happens. Original setting (on new EHA): depth from EHA body to adjusting screw is 6. Like. They are cheap and I usually get them with the fuel filter. But the later 104s are not hot wire, but rather hot film, which still isn't bad, normally good for around 100k and cost less than $200 now. never seen an eha cause any running problem. Moving toward our YouTube cha Nov 4, 2020 · So I had to get my car tested for emissions this year in CA, I always test duty cycle to make sure the fuel mixture is good, this time readings were way off Oct 28, 2016 · This is where the EHA reed valve is mostly in rest position (0 mA). It is a German model with the adjustable EZL-KAT resistor. I have two questions: 1- Would this leaky EHA valve be responsible for choppy idle and intermittent hot start issues that have developed recently or should I be looking at other culprits? May 27, 2012 · One of the more common issues that come up with regard to the drivability of the CIS-E-based cars (420s and 560s, among other lesser cars such as M102 and M103-based models) are the two major system adjustments -- the duty cycle (controlled by the CIS-E mixture control) and the fuel injection control pressure (controlled in part by the EHA servo). Jan 16, 2010 · Because of it's lower HP/torque, the M103 engine is geared differently than the M104 and turns over more RPMs at sustained speed, thus producing earlier valve guide/seal wear than on the M104. 0 May 8, 2014 · And before you remove the EHA, remove any dirt that is sticking to or around it. And for some reason I'm thinking the hoses to the idle control valve. Mar 17, 2012 · The majority of M103 inlet manifolds have a pool of "fluid" at the bottom - under the throttle body. I understand the desire for that quick start. Oct 29, 2023 · Mercedes M103 Engine Design Basics. It was obvious that the car had been pampered and cared for prior to a minor accident. Valve (Electro-Hydraulic Actuator) or fuel regulator. In a correctly functioning KE set up, adjustment of the EHA valve adjuster (only possible by removing EHA valve and screw plug) would render the EHA incompatible with the output current from the KE control unit (N3). Oct 24, 2011 · An EHA current measurement loom-insert will be made. the early M104, the 3. I would cut that skid plate off asap too-I hope they didn't weld it to the sway bar. Jan 31, 2018 · Fuel consumption is poor at 17. 0 L M103 engine. Second version has single valve handle on junction block. Jun 19, 2021 · ) with “EHA adjustment” via the small hidden adjustment screw on the backside of the EHA, by which the EHA’s, or to be more specific, its baffle plate’s currentless rest position itself is changed, which is an option that should only be taken into consideration in very few specific cases, verified by specific tests … and carried out Nov 28, 2021 · Set the correct upper/lower bowl pressures by adjusting EHA valve according to CIS flowtech guide with fuel pressure gauge. Thank you for the AV/heater direction! Tom # May 27, 2012 · One of the more common issues that come up with regard to the drivability of the CIS-E-based cars (420s and 560s, among other lesser cars such as M102 and M103-based models) are the two major system adjustments -- the duty cycle (controlled by the CIS-E mixture control) and the fuel injection Jul 21, 2008 · I turned the EHA a 1/4 turn CW and it has appeared to help my warm start out. Therefore, it is important to find a reputable and trustworthy Mercedes specialist who can properly assess and diagnose EHA valve problems. An egg being cooked on a 3. So those tests will apply to you. It has 120,000 Km on it. Is this what yours looks like? Please post your results if you get another iac and find changes. The relationship between the control voltage and the valve rotation angle is pretty linear, starting from a negative angle to a positive angle with 4 volt as zero degree. Feb 19, 2020 · What was there you can see in pictures. I just had one rebuilt (my m103 has 248k miles). Not cheap but the end result was most satisfying. ) It sounds like folks suggest not wading into a head gasket replacement unless/until it is required. 0 liters. Here Jun 16, 2013 · The valve is connected to a spring and the control voltage is applying a torque to turn the valve against the spring. 4 bar with the valve open. Is it time to replace the EHA valve, or is there a way to properly adjust the EHA valve? Feb 5, 2023 · Two corrections:At 8:32 into the video I said: cuts off the airflowCorrect: cuts off the fuel flow (because of lack of vacuum)At 18:21 into the videoI said: Post 3767518 - Mercedes-Benz Forum and Technical DIY Discussions for Enthusiasts. When testing system pressure, close valve "1" and open valve "3" on first version or open valve on second version. Mar 2, 2017 · My M104 engine demanded injectors of about double the price of the earlier M103 injectors. 437. Of course, the voltage vs air flow is nonlinear. 75% of all M102, M103 and M117 EHAs that are found on CIS-E cars in wrecking yards leak profusely. You can remove the valve and soak it in carb/throttle body or brake cleaner to remove the gunk and give you a decently working valve again. working. May 21, 2012 · eha o2 sensor plugs, wires, dist,rotor all test good or replaced. 8 mA Lambda duty cycle: 46% to 53% Upper chamber: 80 psi Lower chamber: 75 psi At this point, I pulled the EHA valve off, removed the plug, and adjusted the 2mm allen screw. I got a bunch of M103 parts from it. and then think about tuning your duty cycle to 50%. The great thing about these M103 engines is that they are pretty much 1940s technology from their simplistic standpoint. The M103 was replaced by the M104 starting in 1989. _____ Dec 15, 2013 · The opposite can be said for when it gets stuck giving you a low idle. And 12v opens it right up. 0L M103. 05 bar and 5. The M103 engine has unified design with 4-cylinder M102 series. This engine received several Also, GVZ's Sixth Law relates to the EHA: 99. This is a critical component for the Bosch CIS system, so did not want to order an inexpensive reproduction. - Cheers! Jun 3, 2010 · Depending on the age of your car the cold start injector can be powered off the fuel pump relay. Hot wire MAFs are bulletproof, often good for the life of the car. On earlier cars its powered directly from the ignition supply and its timing/switching is controlled by a thermo time switch which switches off after about 7/8 secs when the engine is cold or is disconnects the injector when the engine coolant is warmed up. The engine is well maintained and has fairly new: CPS, coil, distributor cap and rotor, ignition wires, plugs, idle control valve, fuel pump relay, injectors and seals, air intake boot, vacuum hoses. Lift off the air cleaner, it's the black box slightly larger than a match box that is bolted on the side of the fuel distributor (the spider looking silver mound that all the rigid fuel hoses go to). The car was built in late 1987. Nov 20, 2019 · The test calls for two readings. it should do as well, or as bad, with the ecu, etc. mr. When I installed my rebuilt FD, my cold start became very long. But I'd look for a vacuum leak first. Bottom ends on these engines are pretty durable and should be good to go for many more miles. Subscribed. Then I reassembled everything, adjusted the allen screw on the airflow meter to get zero current at the EHA valve at idle, and tested again. Hose leaving junction block 180° from valve handle is "B" and hose leaving junction block 180° from line to gauge is "A". If it is leaking, it is an easy fix (once you have the two new green O rings. The C continuous in CIS-E differentiates the system from the timed pulsed injection of other systems but does not mean that fuel cannot be shut off. 0 engine. Huge vac leak where the injector body boot was not completely sealed was a big part of it, but it still dogged me until I put the O2 and EHA on it and spent an afternoon tweaking the EHA and mixture adjust. When was this last done with proper genuine parts only! The M103 is very ignition sensitive, particularly with "non proper parts". the first one is from the test port and the valve closed. As the field changes, (when the plate on the airflow sensor opens) the reed will move back and forth, changing the size of the valve opening. Pins 3 to 2 is just the EHA current translated into voltage. MMWA. 030 3. Very close to that 0. New EHA Valves cost around $265 so I would buy a new one, instead of taking a chance on a used one for $160 that may develop the same problem in short order. Yeah I know you have to adjust them all the time but I have to take the valve cover off often to fix the leaky front cover anyways lol. Feb 9, 2018 · I have an old 1974 engine driven welder that backfires occasionally when you light off a rod and blows a hose off. Jan 6, 2004 · The EHA turned out the be the culprit. Item was of high quality and was received quickly. If suspected, id just replace it. This was the correct part for my 1988 Mercedes 260E with an M103. The M103 E30 is essentially a bored version of the E26, with a 6. It has a slight shake. Run your finger along the back bottom edge to check for leaks. unplug the ecu and see how it drives. Any tiny dirt particle bigger than 0. Before replacing the EHA I had: Replaced Spark Plugs and Wires Replaced Distributor Cap and Rotor Replaced Vacuum Hoses and Checked Meticulously for Vacuum Leaks Tested the CIS Coolant Temperature Sensor Replaced OVP Relay Replaced Airflow Meter Pot Cleaned and Tested Idle Control Valve Cleaned Throttle Body Thread: 89 W126 EHA Valve Replacement - SPEED Problem car will not go over 30mph. _____ Apr 2, 2024 · Figure 2 If you are having problems with the change over valve one of the first places you should check is the wiring. Oct 28, 2019 · SInce EHA current is a little harder (as you need to jump one side of the pair from the connector to the EHA valve and put the other wire thru a current meter, alternatively you could be measuring the duty cycle (or voltage) at the X11 connector. A. The Mercedes-Benz M103 is a straight-6 15 degrees, crossflow cylinder head with an inclination to the right, automobile engine produced from 1984 to 1997. The EHA valve is on the back side of the fuel distributor. 6 mA May 3, 2014 · This issue could have been solved years ago if it wasn't for your persistence on buying used EHA valves from fleaBay. The 300e EHA valve part number is 000 070 39 62 Just wondering because I found a brand new (genuine Mercedes’ boxed) Bosch EHA valve for a 190e in my junk drawer, but I drive a 300e m103. Ordered a new EHA valve and installed without adjusting, and the car wouldn't start. 94 engine. 010. com/paypalme/IvicaFyMThe part that receives the output signal as cu Aug 17, 2009 · Next thing we need is the rocker arms's like the m103 amg's. Finally replaced the EHA valve/fuel distributor regulator (took 10 mins), PROBLEM GONE AWAY. Let me know thanks E. Posts: 2,580 OP - I listened to your video. M103 Engine (No O2 Sensor) I have a rough Idle with an occasional stall for the past 2 years that I’m desperately trying to figure out. The dealer tried many things including fuel treatment and walnut-shell blasting of the valve stems to remove carbon (carbon? May 4, 2011 · EHA current: -4. Mar 21, 2016 · My M103 car ran strong (bought new) until around 50k miles, always on Mobil premium fuel and driven spirited, then developed a hesitation like you describe when adding a slight bit of throttle. so what else can I look at for this nasty problem? how did you fix your idle problems? on a M103 engine Nov 29, 2011 · the eha can't leak enough fuel to cause a running problem. It is a black square device, about an inch and a half long. The broken little o-ring goes down and the EHA was for nothing there. I do need to drain the tank and clean or replace the screen. Aug 4, 2015 · EHA valve!!! Smell of gas is the classic sign of a leaking EHA valve. the M104 is a 24 valve unit. Car went from 18mph to almost 23 on the highway at 80mph. The rotary valve (as used on the OP's M103) has a no-power rest position that is slightly open, but apparently not defined, leading to observations of differing no-power idle speeds. Wanted to thank everyone for the great information posted here. wnf damze gczqo exydrxdu tmggfh zifbxe qzcf twdbj zcosj typdj