Question about 1994 Mercedes-Benz E-Class

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E220 1994 idle very low when ac is on. Car has no power and a funny smell from the exhaust. With ac turned off idling is much better and more power

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PERHAPS A BAD CATALYTIC CONVERTER. CHECK ENGINE VACUUM AT IDLE MUST BE 20 INCHES OF MERCURY OR THE CONVERTER IS STOPPED UP

Posted on Oct 31, 2013

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Posted on Jan 02, 2017

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SOURCE: vw golf 2 litre 8 valve wont idle when cold

This is sounding like a "Cold start" sequence is not working. Check with an autoparts store for what Temperature sensors your vehicle has. Many have 2 sensors, one for the dash gauge and the other for the engine controls.

A good sensor is needed to activate the "Cold start" circuit. If the sensors are good, then your computer may need reprogramming.

Posted on Jan 23, 2012

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Smoke coming from the hood check engine light


Someone else's code may not help you as the light could come on for a number of reasons. Smoke under your hood could be due to a leak or leaks such as oil, coolant, power steering fluid and so on and as the engine gets hot the fluids will burn off on the hot engine or exhaust causing it to smoke. The smell when you turn the heat on could be because your heater core is leaking. This would be accompanied with low coolant levels, overheating and low heat especially at idle also the carpet may be wet. If your vehicle is equipped with a cabin air filter the smell could also come from there as leaves and other debris and sometimes even rodents can get in there. Also if you don't allow you evaporator to dry by shutting off the ac but letting the fan run for a couple of minutes the water on the evaporator can cause mold and mildew to grow giving you a funny smell as well. Hope this helps.

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2004 chev 2.2 ecotec motor idling rough


Could be a fuel pressure problem or one of the O2 sensors.
Is the check engine light on ?

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My 98 vt commodore has a vibration coming from the exhaust, idles low, has white spark plugs, sounds like its sorta missing, a fumey smell and a lil white smoke coming from exhaust. i have replaced oi


check the compression in all cellenders you might have a blown head gasket, burning smell might be the gas in blown cillender not igniting

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Engine rpms drop very low when AC is on


make sure your engine idle speed correct.air conditioner compressor will take power from engine.the engine has to be fine tune.your engine idle to low have the idle speed control checked.

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1 Answer

Low coolant and oil smells like gas. No white/blue


let your car idle go back to the tail pipe if it seems to be steaming alot , and or smells like antifreeze then you have a head gasket problem or a gasket leak alowing in directly into your engine

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1 Answer

Very low idle speed.


You may want to check your Throttle body position sensor (TPS), and/or, the idle air sensor. This is the most common cause, and in some cases, if your car is acting funny more than at just idle, your Mass airflow sensor (MAF) could be fouling.

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1 Answer

Idle low then hi, and gas smell, and bad gas mileage


This should show up easily on the ECU diagnostics computer at a mercedes dealership. Basically your fuel mixture is way too rich causing your car to be heavy on gas, have a raw gasoline smell, and not run right. Something like this can be caused by a defective oxygen sensor (but that usually produces a check engine light) or it might even be a defective ECU. There is really not way of knowing for sure until you do a proper diagnostics where they hook up your exhaust at the same time and do an emmission test. In most cases it's some sensor that needs replacing.

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