TBI question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

keg · 12-14-2008, 01:57 PM

1987 4WD, 350, auto, 108k. Added some Seafoam to the gas tank, also poured some down the throttle body.

The engine now has a fast idle and when I push on the accelerator a little bit the engine will bog down, blow black smoke out of the exhaust, strong fuel oder, sometimes the engine will die, if I rev it up seems to run fine, this is in neutral. Drives Ok, idles ok when in gear at a stop although it is a high idle, bogs down a litte when starting out.

Sprayed some throttle body cleaner in the TBI, no change. It ran fine prior to the Seafoam treatment other than a rough idle when cold.

Any ideas as to why this would now have a high idle and apparently running very rich at a low idle? Oxygen sensor? Injectors?

12-14-2008, 01:57 PM	#1
keg Registered User Join Date: Jun 2008 Location: Snohomish Wa Posts: 32	TBI question 1987 4WD, 350, auto, 108k. Added some Seafoam to the gas tank, also poured some down the throttle body. The engine now has a fast idle and when I push on the accelerator a little bit the engine will bog down, blow black smoke out of the exhaust, strong fuel oder, sometimes the engine will die, if I rev it up seems to run fine, this is in neutral. Drives Ok, idles ok when in gear at a stop although it is a high idle, bogs down a litte when starting out. Sprayed some throttle body cleaner in the TBI, no change. It ran fine prior to the Seafoam treatment other than a rough idle when cold. Any ideas as to why this would now have a high idle and apparently running very rich at a low idle? Oxygen sensor? Injectors?



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