1991 420SEL Stumbles/Dies on take off - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 09-11-2010, 08:40 PM Thread Starter
BenzWorld Junior Member
Date registered: Mar 2010
Vehicle: 1991 420SEL
Location: Denham Springs, Louisiana
Posts: 8
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(Thread Starter)
1991 420SEL Stumbles/Dies on take off

I have a 1991 420SEL with approx 168,000 miles. About two months ago my car would stumble if I started it up and went to give it gas to take off. It would stumble and I would take my foot off the gas and let it catch up with itself and then I could drive it and it would be fine. This only happens when the engine is warm. It never stumbles on take off if the engine is cold.

For two weeks now it stumbles every time I go to take off after the engine gets warm. It is now bad enough that it will completely die some times as I try to take off. The only way to get it to not die on take off is to take off slowly at first. However, driving in traffic I need to take off quickly sometimes.

It has two new fuel pumps, fuel filter, idle air control, and cold start valve. I cleaned the fuel pressure regulator and now have very smooth idle. The fuel distributor has been recently replaced. I haven't had a single issue with the car until this issue has me afraid to drive it around town.

Any information would be greatly appreciated!! Thanks
Colbert6920 is offline  
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