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SmokinVette.com Forums : Corvette Forums : C4 Corvette Forums : C4 Tech & Performance : runs fine until It warms up
C4 Tech & Performance

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Old 08-15-2010, 08:26 PM   #1
vettennn
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Default runs fine until It warms up

I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Just replaced both o2 sensors and it still happens. I'm done now and I'm bringing it to a shop on Fri. I'll let you guys know what it was when I find out. The opti spark distributer was shot.... After paying $850.00, it runs great!!!

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Old 08-15-2010, 10:08 PM   #2
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I moved this here for you. You should get a better response.
Did you set the TPS when you changed it?
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Old 08-16-2010, 05:00 AM   #3
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Originally Posted by slrvette View Post
Did you set the TPS when you changed it?
Not adjustable on his car; ECM takes "key on" TPS reading and uses that as base figure

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Originally Posted by vettennn View Post
it runs fine until it gets to operating temp.
What temp?
Sounds like you have a problem when computer goes into closed loop and uses the O2 sensor
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Last edited by vetteoz; 08-16-2010 at 05:03 AM.
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Old 08-16-2010, 05:46 AM   #4
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Quote:
Originally Posted by vettennn View Post
I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Please help....

It could be a faulty O2 sensor.
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Old 09-01-2010, 10:13 AM   #5
jmaki
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Quote:
Originally Posted by vettennn View Post
I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Just replaced both o2 sensors and it still happens. I'm done now and I'm bringing it to a shop on Fri. I'll let you guys know what it was when I find out. The opti spark distributer was shot.... After paying $850.00, it runs great!!!
my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak
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Old 09-01-2010, 08:01 PM   #6
robs1988
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Originally Posted by jmaki View Post
my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak
Same thing for you; closed loop problem. Check engine light on?
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Old 09-02-2010, 01:18 PM   #7
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Quote:
Originally Posted by jmaki View Post
my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak

Your O2 sensor may have failed already. Or the wire on it came unplugged. I'd check it out myself before taking it to a shop.
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