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  #1  
Old 01-13-2004, 07:54 AM
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Join Date: Feb 2002
Location: Bulgaria, Sofia
Posts: 584
low idle when there is electric load

Is it normal for the rpm to drop when there is electric load ?? My car is exhibiting the following symptoms -> When the car is cold the idle is just fine then when it starts to warm up the idle starts to flactuate up and down and it sometime dies. When it reaches normal operating temp the idle is fine as long as there is no electrical load. If i turn on the heater, rear window heater or headlights the rpms drop, it's even worse if I turn all of them at once then the car can barely idle . Another thing that I've observed is when idleing in place if I rev the engine to 4000 -5000 rpm and let off the gas the rpms drop to around 600 - 650 and then rise to 850 - 900. My guess is that it's some sort of electrical problem any ideas to what I should check ?


Thanks,
Joreto
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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)
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  #2  
Old 01-13-2004, 08:39 AM
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Join Date: May 2003
Location: DC Metro Area
Posts: 365
Does your car have an idle control valve?

I'd start there. If you can find a used ICV that you know is good, swap it in and see if that fixes the problem. Also - you can try and clean your existing ICV and see if that helps. Sometimes they get clogged with gunk and can't operate as they should.

if your car doesn't have an ICV valve, then I'm afraid I'm out of ideas.

Good luck.

Troy
1995 E420 75k
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  #3  
Old 01-13-2004, 08:56 AM
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Join Date: Feb 2002
Location: Bulgaria, Sofia
Posts: 584
Yes it has an idle control valve. I'll clean it and see if it helps.
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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)
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