No High Idle - 1989TBI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1987SierraClassic · 12-10-2008, 02:12 PM

I'm wondering if anyone has seen an issue with the GM TBI where the high idle (cold) does not function. The truck starts/runs, but it stumbles a lot when it's cold. Once warmed up, it's fine. I've replaced pretty much everything except the TBI itself and I think that may be the next step, or at least rebuild it.

I have two trucks with the exact same problem, so it has to be something in that comes along with high mileage.

Anyone seen this one?

Thanks!

12-10-2008, 02:12 PM	#1
1987SierraClassic Registered User Join Date: Sep 2004 Location: Buxton, ME Posts: 91	No High Idle - 1989TBI I'm wondering if anyone has seen an issue with the GM TBI where the high idle (cold) does not function. The truck starts/runs, but it stumbles a lot when it's cold. Once warmed up, it's fine. I've replaced pretty much everything except the TBI itself and I think that may be the next step, or at least rebuild it. I have two trucks with the exact same problem, so it has to be something in that comes along with high mileage. Anyone seen this one? Thanks!



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