Question about 1987 Mercedes-Benz 300-Class

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ENGINE CUTS OUT WHEN COLD

MY MERCEDES 300E +- 1987. WITH BOSCH FUEL SYSTEM CUTS OUT WHEN COLD AND SOMETIMES WHEN HOT. I HAVE CHANGED PLUGS, CLEANED AND CHECKED DISTRIBUTOR CAP,REPLACED FUEL FILTER,USED INJECTOR CLEANER WITH THE FUEL, CHECKED INJECTORS FOR SPRAY.PROBLEM PERSISTS.

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  • Anonymous Mar 22, 2014

    Fuel injectors

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  • 93 Answers

Replace the overvoltage protection relay...red top with 10a fuse in it next to the motronic behind the battery

Posted on Dec 17, 2008

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1 Answer

Where is airflow meter box 300e mercedes


Under the airfilter assembly and part of the Fuel distributator.
rarley the problem usually a vacuum related issue in mercedes 124s.
see my other post on 300E rough Idle. THis care uses a hybrid bosch mechanical electronic fuel delivery system. easy to diagnose and assumptions are usually wrong. try w124zone for basic information.

Jan 08, 2014 | 1989 Mercedes-Benz 300-Class

1 Answer

Kevincraigjazzmanboy@yahoo.com hard to start cold engine is difficult to pick up rpms , will only rev to about 3500 4000 rpms , cuts , misses when it does so , also difficult to start like timing is off...


Engine is difficult to start when cold
  1. Check the battery condition, battery state of charge and starter motor current draw. Replace the battery if marginal and the starter motor if the current draw is beyond specification.
  2. Check the battery cable condition. Clean the battery terminals and replace corroded or damaged cables.
  3. Check the fuel system for proper operation. A fuel pump with insufficient fuel pressure or clogged injectors should be replaced.
  4. Check the engine's tune-up status. Note the tune-up specifications and check for items such as severely worn spark plugs; adjust or replace as needed. On vehicles with manually adjusted valve clearances, check for tight valves and adjust to specification.
  5. Check for a failed coolant temperature sensor, and replace if out of specification.
  6. heck the operation of the engine management systems for fuel and ignition; repair or replace failed components as necessary.
Engine is difficult to start when hot
  1. Check the air filter and air intake system. Replace the air filter if it is dirty or contaminated. Check the fresh air intake system for restrictions or blockage.
  2. Check for loose or deteriorated engine grounds and clean, tighten or replace as needed.
  3. Check for needed maintenance. Inspect tune-up and service related items such as spark plugs and engine oil condition, and check the operation of the engine fuel and ignition management system.

Jan 06, 2011 | 1987 Mercedes-Benz 300-Class

1 Answer

My 1987 Mercedes 300e won't start and idk why


sounds like the fuel pump! have to test it and the relay! could be hunderd or a few bucks.

Sep 16, 2009 | 1987 Mercedes-Benz 300-Class

1 Answer

I have a 1987 mercedes 300E that stops running while driving or sitting at a light, all electrical still on, what could it be?


I had this once, get the car running and turn the ignition key very slightly and very lightly from side to side while the engine is at idle, this may show up a faulty ignition switch if the engine cuts when you're turning it.
Also the ecu on the nearside inner wing may be at fault, see if you can find a friend with the same car to try swapping over to his first to test as they are expensive is this isn't the problem.
Finally, a common fault with these cars is the fuel pump relay, its the biggest black plastic covered relay in the fuse/relay box, at the rear of the front offside inner wing area.

May 08, 2009 | 1987 Mercedes-Benz 300-Class

1 Answer

Mercedes 2.3-16v 1987 Cosworth flooding injection system


hi,seem all part have been check,to check further,you need to use a pressure gauge, to check the lower and upper chamber of your fuel distributor,only dealer have the tools,valve clearance is a hydraulic valve,no need to adjust,seem your car start,engine timing is ok,ty

Mar 31, 2009 | 1987 Mercedes-Benz Mercedes Benz 190 Class

3 Answers

Engine rough in low idle


I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

tepfy

Feb 27, 2009 | 1992 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

My mercedes e300 (1989) starts and runs ok but then cuts out.


I had a similar problem with my 1986 300e , which got progressively worse until the car was no longer driveable, I changed out the fuel pump relay and the problem went away.

Jan 06, 2009 | 1994 Mercedes-Benz E-Class

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