Fuel pressure is where I would start too.
Cold Stumble
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Intermediate
Joined: May 2013
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Cold Stumble
I have a 95 LT1 with auto trans. I usually warm up the car for a minute or two before taking off. I live on a service drive right off the main highway. If I accelerate at a normal pace to get up to highway speed the motor will stumble and pop then accelerate normally. If I feather it I can get up to speed without a stumble. Once the motor has done it once it will be fine the rest of the day, even on a cold start.
No codes are showing and no check engine light.
No codes are showing and no check engine light.
Team Owner
Joined: Aug 2004
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From: Park City Utah
Race Director
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What is your engine temp on the digital when it does it? How many miles and how old are the o2s?
Last edited by antfarmer2; May 25, 2016 at 09:39 AM.
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Race Director
Joined: Mar 2015
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Race Director
Joined: Mar 2015
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Likes: 579
My 94 did the same thing I just lived with it. Strange thing once I changed the front two o2s it went away. Looking back it was about the time it would be going into closed loop. They do get old and slow. I believe they are normal maintenance others believe they last forever.
Last edited by antfarmer2; May 25, 2016 at 10:20 AM.
Team Owner
Joined: Aug 2004
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From: Park City Utah
I'm not saying that it's not the O2's...it may be. But ex-x-fire is right that the O2's aren't 'in the game" when the engine is cold...and fuel needs to be extra rich.
Safety Car
Joined: Sep 2010
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From: Indiana PA
I agree^ and on a 95 your MAF sensor is THE MAJOR player in determining commands for the fuel injectors. The 02's are for minor adjustments in the A/F. Make sure that it is clean and dirty free.