Question about 1991 Mercedes-Benz 420

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I have a 1991 420 SEL that has 122k miles on it. It has a starting problem after the engine is hot and then sits for 20 minutes to a couple of hours. It's hard to nail down the exact window, but it is a window of time. If it starts, then put in gear, it will stall. It will do this over and over again. To fix it, we have to press the pedal way down to rev the engine to a short period of time. This tends to fix the problem. The problem is starting to occur more frequently and the other day it wouldn't start at all. But after several hours, the vehicle started. I'm guessing perhaps a fuel pressure regulator problem. Vacuum line to the fuel pressure regulator? Thanks/Mark

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Try cleaning your air filter or replacing it and clean your Maf sensor also changing spark plugs if needed would be nice GL

Posted on Jun 09, 2014

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Hi Mark. I was thinking the same type of problem. Either the fuel pressure regulator, a fuel leak or the fuel pump.

Posted on Apr 04, 2011

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