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Old 11-23-2010   #5
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

Quote:
Originally Posted by TheBlizzard View Post
If you car is harder to start when it gets below 30 degrees it is likely one or both of your coolant temp sensors are bad. If they are bad the ECU thinks the air temp is hot so it does not enrich the fuel enough to start it. I would check there first, if not your ECU could have issues as well.
As I said in my post, I replaced one of the sensors (even tested the new one, checked out ok), the one for the ECU. There are 2 more, right? 1 for the A/C and one for the... fan switch? Either way I dont think either of those would have a huge impact on starting. I definitely smell gas if it takes me a few tries to start it without much success... I almost think its probably running TOO rich. Don't have a whole lot of evidence to back this up though. What would cause it to run too rich?

I'm not getting any check engine lights.

I wouldn't be thinking much of this, if it weren't for the fact that it didn't have this problem last year, not even in -10 degree weather, it would at least idle on its own.

I've had the ECU out and examined it closely, no leaking capacitors. Maybe I should have them replaced anyway?

I think i'm gonna log it when it first starts and post it up here for input.
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