Hi all, i am new to this forum. I own a Merc, 1992, 200E, nice to look at. But for over a year now I have been having problems with misfiring. The mechs will come change plugs, and they change the distributor cap, but after a few days it starts misfiring. It can start and a after some ten minutes it dies. Sometimes it cuts the engine while on motion. I have a few questions:

1. Whats could be the major causes of misfires? I have searched and I have compiled a long list from different posts, now I dont know where to start. Can someone check and help me check wether any of these make sense?

Mass Air Flow
Electronic Control Unit (ECU)
Manifold pressure sensor
Airflow sensor
Cam position sensor
Engine wiring harness
Cross over pipes (false air)
Valve for recirculation of gases
Fuel pump relay
Temperature sender
Cold start valve
Rotor arm
Intake manifold gasket leak
CHECK earth wires for: Temperature sender, cold start valve and KE-Jetronic
CLEAN area under the temperature sender and under the air cleaner
CHECK the vacuum system

2. Does the 1992 have a an electronic diagnosis system that could tell the actual problem?

3. It possible to use fuel injection system of another merc model?

Thanks

Shaq

 

I have never heard of a 200E....but either way, if she is dieing mid-driving, check the Overvoltage protection relay (OVP) that sits behind the battery.

As for the misfires, start with the basics --> Plugs, wires, distributor cap AND rotor.

There is no Mass airflow exactly on the CIS system. It is a throttle plate that is adjusted by the potentiometer. Make sure that the plate is sitting correctly in its housing.

As for diagnosis, I am not sure because I am not familiar with a 200E at all...or which country it is from (I assume it is european/asian)...But there is usually a diagnostic port by the battery. You may or may not need to build yourself a code reader to get them. Is the check engine light on?

 

Dude, it's bad form to post the same question twice, especially when you were given a answer(s) the first time around. The usual etiquette is just to take your original post and post back to yourself, 'bump'...this moves it back to the top of the page and we can see/understand that your question hasn't been answered yet.

Kevin

 

Kevin

Sorry, when I posted that messase the system indicated failure and had to rewrite the stuff, only to realise that both messages got posted. Sorry anyway

Kevin

Thanks alot for the advice, will check those things. 200E were manufactured in early 1990s I guess, mine was made in Germany in 1992. Mercedes says they were mainly exported to Italy, but I got nit from Japan. It doesnt look very different from 260E, I thikn the body is slightly longer

Thanks

Shaq

 

Hi ps2cho

Here is a link with a photo of Mercedes Benz 200E. Note the mercedes logo is not fixed on the grille as the other 124, its fixed on the hood itself. You asked wether the check engine is on, no its not

Thanks

Shaq

http://cars.st701.com/cars/view/3026...3Dmercedesbenz

 

Start with the basics in the ignition. You said you already replaced the wires and distributor cap, right? What spark plugs do you have? Check the gaps are correct.

From there hit the rotor next. Its a $20 part here...just replace because its not worth the hassle to pull it all off just to check it for that price.

After that check vacuum elements. Listen around the engine and spray some carb cleaner around the injectors and all vacuum hoses to see if the engine responds at all. If any of the hoses that are attached to the Idle Control valve are hard -- replace them right away. There are two on the ICV, one from the head to the valve cover, and the 4th from the valve cover to the air intake assembly.

I am a fan of also pulling the idle control valve completely off (two bolts and its in your hand) and spraying it clean with carb cleaner. You will be surprised the amount of crap that comes out of it. The ICV can get stuck open instead of closing like it should over time if it gets bugged up.

 

You should post your location, model and year and engine, and what you have done to the car to alleviate the situation.


At a minimum.

 

No problem and I'm not the board 'police' or anything close to that. We have some posters that are impatient (and ungrateful) and if they don't get an answer right away, they keep posting. On the other side of the coin, many race in here (pun intended) ask an answer, then leave as soon as they get it. I understand many people have poor manners and behave like dogs, but it doesn't further the information data base on this board if we don't follow through from the advice to the resulting repair attempt.

Kevin