Question about 1985 Mercedes-Benz S-Class

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1985 380se has problem idling. Runs fine, but when waiting for a light to change it almost stalls. It has new plugs, runs on premium fuel, Any ideas?

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Isle speed sensor failing....or possible failing fuel pump...

Posted on Jan 05, 2011

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Could be a fuel pressure regulator not working. Thus ecu complaining about fuel Pressure. probably not enough because the regulator is worn and leaking down so will not maintain the proper pressure. You will need to google the make model and fuel pressure regulator to find it's location or library and repair manual. Otherwise, you need to measure the pressure and find the spec for the required fuel pressure. Probably somewhere around 120PSI

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Engine Dies in Idel


being a certified mechanic has its advantages. there are multiple causes for that problem: lack of air or lack of fuel.
make sure the air filter is mostly clean.
check throttle plate (where air filter tube goes into motor), most likely black with soot and carbon. clean with tooth brush and gas, wipe off with clean rag. repeat ultil CLEAN.
low air flow past plate when closed (idle) will cause stall condition.
dirty throttle body is a common problem with lots of cars. causes engine stall.

dirty fuel filter will also cause this problem.. low fuel pressure at idle.

I also believe that your car is equipped with an idle air control valve. (regulates a bypassed air flow to motor at idle) this valve may be stopped up or non-functional. have local shop take a look, but there are ways to check valve if you consider yourself mechanically inclined

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