TBI has very rough idle when cold.. please help
Thread Starter
Supreme Member
Joined: Jan 2001
Posts: 1,244
Likes: 2
From: Kelowna, B.C.
Car: 89 Camaro RS
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 2.73
TBI has very rough idle when cold.. please help
I checked the history, found nothing similar.. for the past two days in the morning (average temp 41, 87% humidity) 89 305 TBI, fires up with no problems, but instead of a smooth warm up idle, it sounds
like a cold diesel engine when it first starts, it's as if the car is running on 4 cyl. I get no codes, and the problem dissapears in about a min. and has a normal smooth idle with no problems for the remainder of the day.. This lately only happens in the morning, and I've never had the problem before.. I've checked over wires, ect. I'm suspecting the IAC, But I don't have much experience with ECM control cars.. I have the Helm Shop manual, but have not found much yet. If you need more info, let me know.. I'm going to take a tape recorder with me tomorrow morning, if it does it again, I'll tape it and post a MP3 around 5pm PST.. Till then, I'd really appreciate any thoughts on the matter. Thanks
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89 RS Camaro, LO3 305 TBI
Autometer Air/Fuel Ratio Guage
Cooling Fan Overide Switch
L69 Duel Snorkel Intake
Dynomax Ultra Flo SS Cat Back
like a cold diesel engine when it first starts, it's as if the car is running on 4 cyl. I get no codes, and the problem dissapears in about a min. and has a normal smooth idle with no problems for the remainder of the day.. This lately only happens in the morning, and I've never had the problem before.. I've checked over wires, ect. I'm suspecting the IAC, But I don't have much experience with ECM control cars.. I have the Helm Shop manual, but have not found much yet. If you need more info, let me know.. I'm going to take a tape recorder with me tomorrow morning, if it does it again, I'll tape it and post a MP3 around 5pm PST.. Till then, I'd really appreciate any thoughts on the matter. Thanks
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89 RS Camaro, LO3 305 TBI
Autometer Air/Fuel Ratio Guage
Cooling Fan Overide Switch
L69 Duel Snorkel Intake
Dynomax Ultra Flo SS Cat Back
Thread Starter
Supreme Member
Joined: Jan 2001
Posts: 1,244
Likes: 2
From: Kelowna, B.C.
Car: 89 Camaro RS
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 2.73
Well I'll bump this back to the top.. in hope someone will read it and provide some thoughts as to what the problem could be...
Supreme Member
iTrader: (1)
Joined: Jul 1999
Posts: 1,334
Likes: 1
From: Key West, Florida!
Car: 89RSconvtZZ4TPI
Engine: ZZ4TPI
Transmission: 700R4 TRIPP TRANNY
I'm definately no TBi expert but our work truck, an 89 350 TBi ran rough in the morning and as it warmed up it smoothed out. Eventually it went to a no-start condition. Turns out the pick-up coil inside the distributor went bad. Lots of moisture. Something to look at.
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Rob P
89RSconvtZZ4TPI Edelbrock Intake
SLP Dual Cold Air Intake 1 5/8" Headers Semi-Siamesed Runners, IROC
suspension, alum shaft. Numerous mods.
92Z28convt5spd (stock)
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!
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Rob P
89RSconvtZZ4TPI Edelbrock Intake
SLP Dual Cold Air Intake 1 5/8" Headers Semi-Siamesed Runners, IROC
suspension, alum shaft. Numerous mods.
92Z28convt5spd (stock)
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!
Thread Starter
Supreme Member
Joined: Jan 2001
Posts: 1,244
Likes: 2
From: Kelowna, B.C.
Car: 89 Camaro RS
Engine: 305 TBI
Transmission: 700r4
Axle/Gears: 2.73
Thanks I'll add that to my list to check on in the morning... What is that "no-start condition", today.. it's idle smoothed out in less than a min... I was going to post a sound sample of the car running .. but the recording was not all that great.. I am planning on pulling all the spark plugs and checking them over.. I've never experienced moisture in the distibutor.. Thanks for the help so far..
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