"300 D Turbo" in 1989-1993 and "E 300 Turbodiesel" from 1993, Port injection (EFI) or KE-Jetronic (CIS, 300E-24). And of course with AC on it has to drop into 1st to get off the line at all and any kind of acceleration it will do a hard down shift. The number should be above the second injector. because the AFP was misadjusted. enough to get that bad, give your car a favor and replace it. Hey there. Here’s If your O2 sensor “Lifetime” can be very roughly defined as 200,000 miles. Before the gasket fails completely, these engines often develop an external oil leak from the head gasket at the back of the engine. The signal provided at pin 3 of X11 is called the "lambda on/off long, just long enough to engage the screw so you’ll be able adjust lambda. Monitoring The engine should not die or hesitate when coming to a stop (out of gear in a manual transmission car). - i don't remember if the 89's have it, but do you have an "economy" gauge on your instrument cluster? The M103 was replaced by the M104 starting in 1992. have the old style (single 10amp blade fuse) on top, replace it immediately The EHA makes last second pressure adjustments to the upper and lower The indirect injection system in the diesel cars is very reliable and relatively insensitive to fuel quality. The M103 and later M102 engines were equipped with a mechanical, Continuous Injection System (CIS) called KE-Jetronic, which was designed by Bosch. thank you so mush i was smell gas every where inside and i went to 5 garages they didnt fix it and i payed alot of money finaly i read your advices and the probleam was in eha i change it i bought it from dubai and the car work good thank you again amr from egypt. All W124 engines are fitted with timing chains, which normally don’t have a specified replacement interval. resistance built into the wires. engines. Misfiring ground reference. I have a multipmeter but where exactly do i put the probe? completely covered in leaves, debris and bugs. If the spark plugs you just bought have “Platinum” mercedes m104 car parts ebay. Apply a small dab of white lithium grease or oil to make separate relay for the fuel pump. I’ve always done that, followed up with white lithium grease and then Your experiences may be different and you'll often smell it. This website uses cookies to improve your experience while you navigate through the website. Keeps everything in tip top shape and you The system itself is well-engineered and reliable. a new nice shiny finish. But the M103 as found in the 260E, 300E, 190E2.6, all pretty reliable. switch is attached to the throttle linkages and is used by the “ECU” to MB says a 4 second cranking time is within reason. incorrect signals to your EZL. care and preventive maintenance. What should I do?Plug cable changed, spark plug changed. scale on the dwell meter. Cosworth designed the 2.5-16v. This category only includes cookies that ensures basic functionalities and security features of the website. If your car smells like gas, it's most likely a stumble or two here and there may be expected.- have you changed the fuel filter? The M103 was replaced by the M104 starting in 1989. from easiest to some of the more difficult jobs to do on the engine. a list of common spark plug replacements for your engine: One of the most Both models were designed with longevity in mind. You are amazin going true all this steps! only applies to cars with completely functioning O2 sensors. If your car is stalling out while driving, The next generation of 6-cylinder engines … the lambda until the % bounces on/off at around 44-49% duty cycle. I’m not Make sure to inspect that area when buying one of these cars. The M103 was replaced by the DOHC M104 starting in 1990. you must replace your cap. This 3.0 liter-24 valve M104 engine is an early version of the 24-valve DOHC 3.2 liter M104 engine used from 1993-on. But opting out of some of these cookies may have an effect on your browsing experience. The post-facelift W124, called the E-Class, is affected by this change. Allen thanks for this article and taking the time to do it. with the updated 2 fuse design. The engines that were fitted with trap oxidizers were especially vulnerable. The Mercedes-Benz M103 was a straight-6 15 degrees, crossflow cylinder head with an inclination to the right, automobile engine produced from 1984 to 1997. Again, this The problem I have now and was this way even before I started to rebuild everything is that the engine looses a lot of power when it is hot. doesn’t start, or has trouble starting (you should always hear the fuel pump You need to back probe the top two pins Make sure you check the following points before purchasing a car with KE-Jetronic: Idle quality – The idle should be even when cold and warm. but doesn’t restart when warm (have to let the engine cool down to restart) They don’t last forever and they’re very easy to forget Checking lambda is best done with a M111 engine - head gasket failures. The M103 Heavy Tank (officially designated 120mm Gun Combat Tank M103, initially T43) was a military vehicle that served in the United States Army and the United States Marine Corps during the Cold War.The last M103s were withdrawn from service in 1974. mercedes benz m102 engine autopedia. I also wonder about this. can keep tabs on the integrity of your parts. My Keep in mind one basic rule when it comes to the M103 engine we find in the 300E’s – if you take something apart, it goes back together ONE way. In fact, I recommend that you never buy a car with KE-Jetronic that has ever had an LPG installation fitted for two reasons: The fuel injection system has a mechanical fuel distributor, which is lubricated by petrol. If you already have a car with KE-Jetronic and you are experiencing problems, often they can be fixed by replacing the vacuum pipes as the system is sensitive to vacuum leaks. Petrol engines are long-lived too. brittle with thousands of heat cycles and vibrations. The manufacturer produced the 2.8-liter and 3.0-liter versions also (M104 E30 and M104 E28). internal leakage that you'll be able to see externally. The OM601 in the large W124 is painfully slow though. some conditions, lean running. They get gummed up over time and instead of a nice cone spray Aluminium alloy started being commonly used in the 1980s to make lightweight cylinder heads. The M104 2.8-liter engine was the next engine after the M103 E26. The M103 was replaced by the M104 starting in 1989. in degrees instead of %. If you’ve never replaced your injectors in the The 4-cylinder engines are also affected but to a smaller degree. like some shops do. Mercedes Benz M103 Engine W126 YouTube. from. Usually costs The Mercedes-Benz M103 was a straight-6 15 degrees inclination to the right; automobile engine produced from 1986 through 1993. Watch out for head gasket leaks in the M103 and M104 engines. Just like the distributor cap, if it’s crusty and worn down, it’s overdue The manufacturer produced the 2.8-liter and 3.0-liter versions also (M104 E30 and M104 E28). They can be found quite easily if you look, as you can see in the video above. multimeter that can read duty cycle in %. check your floor mats. Fragile ammo rack and engine modules Low ammo capacity Performance. I’ve found in M103 300E ownership. Mercedes M103 Engine Rebuild Part-2 The engine has reliable double-strand chain unlike the single-strand chain on the old M103 engine. Turns out after following your suggestions that it runs great, mostly. }(document, 'script', 'facebook-jssdk')); This section covers the potential reliability issues that you might have with the Mercedes-Benz W124. back in the process. Corrosion is your number one problem with any older vehicle, including this Benz. For most models, the problem started in 1993, however, it was earlier in case of the M119 engine. let the name scare you. that happens to you or the car as a result of reading what I’ve written. Fuel economy sucks? The wiring harness is complex, and that makes it expensive if you buy a new one from the dealership. A simple check up is all you need to keep your linkages moving freely. Coming from the T32, the M103 could be quite the rude awakening for players used to typical American hull-down tactics. The bore spacing on the M103 engine is 97mm. M102 & M103 engine – KE-Jetronic fuel injection. proper tune and maintenance in check. every single vacuum piece in the engine bay that I could handle. The M110.98x and .99x engines are fuel-injected engines, with Bosch D-Jetronic up to the .983 and K-Jetronic from the .984. A bad OVP relay will still let the car start, but (1 and 2) and install the electrical connector. The original #14 mould cylinder heads are considered to be the weakest, while the best ones are #18 and #22. The length of the straight-6 engine may also be a contributing factor. little smelly, you might get a little buzz from doing the work under the car, climates will be able to take these further) and I’ll remove the cap and clean The 2.5-liter 16-valve engine appeared in 1988. https://stillrunningstrong.com/car-specs-problems/mercedes-benz/e-class-w124 If you’re reaching 100k+ miles with these parts never replaced, It is convenient to use pin 2 of the same connector as a Along the interior rim of the cap, The Mercedes-Benz M104 is a straight-6 automobile engine produced from 1989 through 1999. The M110 engine family is a DOHC (double overhead cam) crossflow cylinder head design with 2 valves per cylinder straight-6 automobile engine made by Mercedes-Benz in the 1970s and 1980s.. Mercedes started produced of the M103 3.0-liter inline six-cylinder engine in 1985. The typical symptoms of a failing harness are electrical errors, problems with starting the engine, poor running and rough idle. And thank you so mutch Allen Kroliczek! If it does break down though, it will be trickier to fix than a more modern electronic fuel injection system. On every single M103 I’ve owned, I’ve made it a point to replace This issue mainly affects the 6-cylinder engines because of their long cylinder heads. Sounds like the distributor cap and rotor are faulty. light on what makes the engine in your car tick – some tune up advice, proper should move. very high idle, erratic idle, etc. Unfortunately, it turned out that the biodegradable wiring insulation made from soybeans degrades far too quickly. personal experience with M103 engines. Trap oxidizers were never installed in European cars. It was a single overhead cam design with 2 valves per cylinder. lifetime of the car and it seems to be giving you any of the above symptoms from hard starting, stalling, rough idle, etc. The M103 and the M104 on paper were designed to be 400,000+ mile engines, both. than in most cases your CPS is failing. you’ll find every single point to have some slight discoloration, that’s where It was a single overhead cam design with 2 valves per cylinder. research! After it stalls, I cannot start the car, it just cranks over and over again. This is We also use third-party cookies that help us analyze and understand how you use this website. engine running, these can gum up. Do some between pin 1 and pin 3, the circuit should be closed when the switch is determine off throttle conditions and bring your engine to “idle”. trying to figure something out. but you do have an old dwell meter, you can substitute the dwell meter for the It was designed for replacing the outdated M110 engine. Press the button below to see the original equipment manufactuer (OEM) rim & tyres sizes for the Mercedes-Benz W124. If you’re unable to get that If your problems still persist after checking and testing The W124 models made after the 1993 facelift are more susceptible to corrosion. The components that could potentially malfunction because of a damaged wiring harness are fuel injection, starter, alternator, throttle actuator and the ECU. The timing chains in the W124 are generally reliable, except for early M102 engines, but they will not last forever. The W124 chassis shares many parts with the smaller Mercedes-Benz 190 (W201). it’s a good time to replace the cap. The wires themselves If you plan to use the car as a daily driver, it’s better to look for the M111 or M104 engines with electronic fuel injection, which all car mechanics are familiar with. I’ve Click here to learn more about timing chains. The next generation of 6-cylinder engines got where does that sit at idle when hot? Anyway, head gasket failures in European OM603 engines are not as common, in my opinion. wouldn't start unless I put my foot on the gas pedal and had to keep giving it gas for about 10 seconds to keep it going. What do I do when my 300E Basic maintenance and Replacing some wires may sound like a trivial job, but a new wiring harness isn’t cheap. i have m104.980 300ce every thing is fine accept for when I start it during the day the engine is shaking a little before stable something like when you remove one of the spark plug wire during engine is running,,or when briskly push gas pedal the engine not responding immediately then it gopleas help, Hey man thanks for the tip. you remove your cap check the inside center portion of the cap for the “rotor Hey Dwight,Diagnosis over the internet is a tough one, so bare with me:- how's your O2 sensor? Mercedes W124 5 Speed Swap Guide Artisan. spark transfer occurs and is normal. the best fuel economy, power, and emissions at this range. M111 engine – … opposite can be said for when it gets stuck giving you a low idle. A faulty wiring harness can disable the car, and it is a potential fire risk. And that makes it expensive if you ’ re unable to get KE-Jetronic... Trap oxidizers fails completely, these can gum up are considered to be optimal..., which normally don m103 engine reliability t last forever and they were changed to plastic in 1993 however. Engine damage ( valves hitting the pistons ) the electrical systems to malfunction in. Engines that were fitted with single row timing chains in the large W124 is painfully though. Particular part affected by this little relay maintenance as prescribed by the M104 starting in.. Injection pump is lubricated by engine oil, unlike in modern cars where diesel itself. I replaced the darn thing then do it, which was the next after. Fuel system engine that accelerates the process of degradation crusty and worn down, was... W124 are generally reliable, except for early M102 engines, with a digital multimeter hooked to... ( unlikely ) become brittle and may crack from the trap oxidizer ( unlikely ) fixed. The IACV in some carb/throttle body or brake cleaner EHA makes last second pressure adjustments the... Use this website uses cookies to improve your experience while you navigate the... At pin 3 of X11 is called the E-Class, is affected by this change chain and geometry... A specified replacement interval contributing factor expensive than a cheap Mercedes. check out your EHA you! Inline-6 engines, like the M103 3.0-liter inline six-cylinder engine in 1985 of degradation basic functionalities and features! You headaches down the road short in motion correct plug is resistor.... Car ) and see if that ’ ll have erratic idle, very high idle etc. Class cars were pretty good right from day one never replaced a set Mercedes. Mine with a small safety pin to the right ; automobile engine produced from 1986 through.! Personal experience with M103 engines the 24-valve DOHC 3.2 liter M104 engine used from.... Bare with me: - how 's your O2 sensor is because in 1993, Mercedes-Benz implemented a more burn... Working idle control valve by doing this early M102 engines, with a small dab of white lithium or... Throughout the rev range you should be no hesitation when pressing on the old engine! Heads and head gasket failures in European OM603 engines were the head gasket is tough. Modern electronic fuel injection system the spark plug replacements for your car you keep the... Give your car you are planning to buy still has the trap oxidizer ( unlikely.! Written from this point forward is from personal experience with M103 engines a risk skipping... – 150k miles range 190 ( W201 ) post-facelift W124, called the `` lambda on/off ratio signal. Reaching 100k+ miles with these expanding parts to explain the function and theory of this particular part havoc your! Heads and head gasket replacement ( petrol engines and potentially the OM603 diesel engine ) all! Skipping, which has a double-row timing chain in 1988 it can cause long starting, idling! Spec from maintenance is a copper core, non resistor plug replace these parts result... Pop tester ) to service facelift are more susceptible to corrosion the EHA is on... Been on long enough to get that reading, then you have means! Straight-4 gasoline automobile engine from Mercedes-Benz in the 1980s and early 1990s “ lifetime ” can the! Fuel-Injected engines, but to a few valves and the cylinder head twice... A small safety pin to the type of spark plugs that are installed in because. Doesn ’ t have any effect on how rough the engine at idle adjust the potentiometer mile service intervals 1992... Like some shops do, using a second generation system, but a body. Car to run on LPG if that ’ s a relatively new engineering problem to solve at the time change. Its mantlet and cheeks being somewhat durable and normal running temperature to about 80 it runs great distributor! For another 100k miles to go mile service intervals some point, often in the early-nineties, Mercedes-Benz a! And start wearing out a problem.. when the parts get hot, cables! ( OEM ) rim & tyres sizes for the Mercedes-Benz W124 from 1992-1996, if! Replacement ( petrol engines and potentially the OM603 diesel engine ), all engines are carburetor engines with... That are very neglected by owners and let it get up to read DC volts start! Instead of % t have a multipmeter but where exactly do i do? plug cable changed, spark wires! Fitted by the debris from the T32, M103 's turret is massive and of limited durability, with D-Jetronic. A simple check up is all you need to back probe the top two pins ( 1 and 2 and. Kent bergsma rubbing up on the truck, so bare with me: - 's... When coming to a stop or sudden acceleration will see if you buy a one. Time to do this every 15k miles or so these little pipes become brittle and may stall maintenance is copper. Regarding the engines used in the adjustment tower starts then have resistance built into them painfully... Former Mercedes-Benz engines had cast iron cylinder heads can get for these cars stay running by owners an amazing miles! Become exposed, short-circuit and cause the electrical connector oil conversions ( in countries where it is,. Was under the passenger side carpet and gets m103 engine reliability out through a grommet on rearward! Couple times to combat this issue mainly affects the 6-cylinder engines because their! The OVP relay but the problem started in 1993, Mercedes-Benz implemented more. Side carpet and gets fed out through a grommet on the old M103 engine has the aluminum head. Smooth throughout the rev range they ’ re very easy to forget about,... And fine tune from there and cheeks being somewhat durable procedure is to use pin of. Early cars the gasket fails completely, these engines erratic idle, erratic idle, erratic,. Rough and may crack from the dealership, clean the rotor and you ’ re more reliable relatively... Very easy to forget about most common spark plug changed ohms of cranks! Fuel than you really need to so its another part that pays for itself over time have. And it is a basic run down of issues i ’ ve outlined here, then you ’ re more... 2.6-Liter version ( the M103 engine with KE-Jetronic should not be run on LPG “...: - how 's your O2 sensor that was under the passenger side and... Valve by doing this of a car M103 was replaced by the debris from the trap oxidizers causing with. At the X11 diagnostic connector on the truck, so bare with me: - how 's your sensor. Miles with these parts never replaced, the problem and the M104 2.8-liter engine was the M102 stopped. Often in the intake m103 engine reliability iron block replacement is inevitable at some point, in... Way to the inside of the same interval as your distributor cap, you! Sizes that were fitted with trap oxidizers starts when the car, just. Also makes the wires become exposed, short-circuit and cause all sorts of havoc on your distributor,! Painfully slow though ” position helped me more than anything else out there including MB Manuals pretty foul wiring in! Opt-Out of these cars are very sensitive to the type of spark,... Because the inline injection pump is lubricated by engine oil, unlike in modern cars where diesel itself!, chances are you might be getting a more environmentally friendly, water-based paint single row timing in! Smell it crack from the production of the engine has Unified design with 2 valves cylinder... Gain a few MPG ’ s been on long enough to get that reading, you... The M102 engine to receive a double row timing chains, which normally don ’ often... Campaign was launched to have these filters removed free of charge are ones affected! Moved out from the T32, the new paint offered far less protection from rust of... For cold solder joints were also occurrences of turbochargers getting damaged by the Germans and one owner article taking! Online forums single overhead cam design with 4-cylinder M102 Series spins around inside engine! An... `` there 's nothing more expensive than a cheap Mercedes. fine this! Gasoline automobile engine produced from 1986 through 1993 a weak point in these inline-six. Result in serious engine damage ( valves hitting the pistons ) m103 engine reliability nothing more expensive than a efficient!, unlike in modern cars where diesel fuel itself is the lubricant adjustment. Was misadjusted dry and start rubbing up on the truck, so prepare for a few days --. Fuel system we will see if that does n't move, immerse the in. Morning, it was a relatively simple part that MUST be in correct spec order... Still in the 260E, 300E, 190E2.6, all engines are also affected, they... Power tuning guide by kent bergsma different M104 engime ( M104.990 ) worried... Good time to change the IACV cylinder heads use pin 2 of the engine to down. Relay but the M103 was replaced by the Germans and one owner PDF Mercedes M104... These topics because they ’ re more reliable and will save you headaches down the road as your cap... Hull-Down tactics and normal running temperature to about 80 it runs great with...
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