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Old 11-23-2010   #2
s1ngletracker
 
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
Re: Cold plugs, cold weather cold start idle implications

Ok, so today was pretty awful. Still looking for help on this. Pulled the plugs, they seem fine, I'm assuming they aren't the cause.

-Compression tested, came out normal
-Swapped out MAS for a known good one, no change
-New coolant temp sensor
-Swapped out hte ISC, which tested good, but there still might be a slim chance it is bad
-I have previously deleted the wax plug fast idle thing. I realize this impacts cold idle, however, it was deleted last winter and didn't have this problem

Things I'm going to test/change out:
-Plug wires
-Coil
-Ignitor
-Look at fuel pressure while cranking and ensure all is good there.

Could these be the cause? Are there any other ideas as to why my car just WILL NOT idle on cold starts? I have to hold down the gas for about a half minute before the car will idle on its own without dying.

Also, side question, to properly set the idle, I just need to ground out the one pin on the test connector at the firewall, then adjust the base idle screw, right? Or is there something else involved? The manual is a bit confusing on this, it talks about grounding something else out, a pin on the diagnostic connector that my connector doesn't even have.

Any help is appreciated. I realize there are few knowledgeable people here that even drive dsm's anymore, and even fewer that daily drive them in the winter, but worth a shot.
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