Rough running
Thread Starter
Registered User
Joined: Sep 2009
Posts: 4
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From: Roseburg, OR
Rough running I have a 1994 Pont. Firebird Formula 5.7L LT1. After the engine warms up it will load up and cut out under acceleration. When it's cold it runs great. I've replaced the plugs and plug wires, and the EGR valve. What might the problem be? Could the plug wires be a bad set and need to be replaced again? Has anyone else had this problem, Please help.
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Nick
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Nick
Last edited by caddman6425; Sep 19, 2009 at 04:42 PM.
LT1 rough ? You might check your TPS sensor as it may be bad causing rich running when Warm ??
Or an Oxygen sensor ?
Do you have a check engine lite lit ? If so, check your codes n go from there !
All else fails, dump it and install a LS1.. :-) just kidding....
Or an Oxygen sensor ?
Do you have a check engine lite lit ? If so, check your codes n go from there !
All else fails, dump it and install a LS1.. :-) just kidding....
Thread Starter
Registered User
Joined: Sep 2009
Posts: 4
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From: Roseburg, OR
Have a sensor testor, and it said the TPS was fine. Well, I think it did, it showed the TPS moving the whole range while moving the throtle. No SES lights come on. Haven't checked O2 sensors yet.
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Nick
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Nick
Thread Starter
Registered User
Joined: Sep 2009
Posts: 4
Likes: 0
From: Roseburg, OR
Thanks a lot David, it was the O2 sensors. Both were bad. One had a broken ground wire with a open circut, and the other had both circuts open. Changed them out, and all runs well. Thanks again! 
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Nick
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Nick
