Question about Mercedes-Benz 420-Series

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No power to fuel injection or fuel pump on 1987 mercedes 420 sel

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Did you get your car running. We had a chat a few days ago and I have not heard back from you. If I was helpful please rate me.

Posted on Jan 01, 2009

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ECM (also known as the computer) issue. Not for a "do it yourself person" on this car, unless you have tools and skill. If not take it to a dealer or qualified mechanic.

Posted on Dec 30, 2008


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My 1990 420 sel will run for awhile, then suddenly stall. It will restart after a while and then seems to be ok, though it can stall again under load and at rest. Is it time for a new fuel pump? Cheers...

Hi rex.... dont throw parts at it until you check fuel pressures..... get a gauge and put into fuel rail... drive or run and check pressure when fauly occurrs.... might only need a fuel filter..... also it may be possible that your ingnition unit (TZI) may be starting to give problems...... the clue being cuts out after a while with hot engine, then restarts after a while.... so check fuel pressures, if they are ok, then you are probably looking electronics.... hope this helps....... Steve....... Botswana

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Location of the fuel filter on a 1989 Mercedes Benz 420 sel

Nov 25, 2010 | 1989 Mercedes-Benz 300-Class

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1990 Mercedes Benz 420 SEL computer problem? wont

This could be caused by a faulty Crank position sensor. The computers are expensive for this and not something that commonly fails on these. Have the fuel pumpchecked for operation and pressure. Check for spark at the plugs. Then we can procede further if you would like.

May 22, 2010 | 1990 Mercedes-Benz E-Class

1 Answer

420 sel door locks individually ony . it use to lock all doors with one key

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May 04, 2010 | 1987 Mercedes-Benz 300-Class

1 Answer

1987 420 SEL, when starting to run the car after months not used, it is in emergency mode only. Have to drive it on throttle or off throttle or it starts bucking. The car has 140,000 miles on it, worried...

the best thing you can do for this car is drain the tank and start again. the injection system this car uses is a very very good but tempermantal one and poor fuel quality or contamination(like water) will feel like the world is coming apart. change the fuel filter also which is in the rear near the right wheel. it will be a pump with the filter right next to it. these are really great cars. once the tank is drained and good fuel poured in, replace the spark plugs with bosch w8dc with a plug gap of .032".

Jan 11, 2010 | 1987 Mercedes-Benz Mercedes Benz 400 Class

1 Answer

The door locks on my Mercedes 420 SEL lock

Inspect first the wiring of the car. A grounded wire may cause this.

Nov 11, 2009 | 1987 Mercedes-Benz 300-Class

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Does the mercedes-benz 1986 mercedes 560 sel have fuel injection or carberator?? if so send me pic of engine with f-injection/or carb

hello, 560 sel,,,model 126.039 engine with v-8,engine number 117.968 ke is is fuel injection system.ref. book;technical data mb,ty

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