Running rich on cold start?
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 3,524
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From: Pinellas Florida Misfit
Cruise-In III Veteran
Running rich on cold start?
Since I got my PCM back... the car seems to be running very rich on cold startup until it gets above 130-140 F. No black smoke or anything, just very strong smell of gas coming from the tail pipes. Once it warms up the smell goes away and exhaust seems fine.
Whats done to the car...
LT4 with Hotcam, Ported intake, 160 deg t-stat, PCM reprogrammed, K&N, exhaust is all stock at the moment.
When the guy programmed the PCM, I had him disable the rear o2 sensors and disable the AIR system... possibly the AIR system being disabled thats causing this? it is still in place thou....
Whats done to the car...
LT4 with Hotcam, Ported intake, 160 deg t-stat, PCM reprogrammed, K&N, exhaust is all stock at the moment.
When the guy programmed the PCM, I had him disable the rear o2 sensors and disable the AIR system... possibly the AIR system being disabled thats causing this? it is still in place thou....
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: Running rich on cold start? (Springer's LT4)
the AIR system directs air flow to warm up the cats quicker for more efficient burn. It sounds like it may be contributing to your problem.
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 3,524
Likes: 1
From: Pinellas Florida Misfit
Cruise-In III Veteran
Re: Running rich on cold start? (ittlfly)
From what I can gather reading.. thats sounds about right. Funny as it's not blowing any type of smoke at all.. just smells real rich. Runs great after a couple minutes :D
Time for long tubes I guess :)
Time for long tubes I guess :)
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 3,524
Likes: 1
From: Pinellas Florida Misfit
Cruise-In III Veteran
Re: Running rich on cold start? (Nathan Plemons)
I was planning on the longtubes/cat removal in a couple of months which is why I had the PCM programmed to disregard this stuff now. No sense to send the PCM out twice in that short of time. In the mean time I'll just keep the car up a few hundred RPM to get it to warm up quicker.
