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Hello,i have 1991 chevy silverado 5.7 liter throttle body 4 speed automatic with 85,000 miles.The problem is on cold start ups it has to turn over several more times than normal to start then when it does the idle go's up and down and up and down almost to the point that engine stalls and then when i drive it it spits and sputters and misses until it warms up then it improves but idle still go's up and down.Also when i shut it off at running temp and wait 15 to 20 minutes then start it the idle comes up then drops and engine will die then i can restart it and it will stay running.Would very much appreciate any suggestions you may have.Thank you for your time.Dave.
Hi David,
Possibly the idle air control valve in the throttle body just needs cleaned....can do it without even removing it probably.
A vacuum leak could also cause that, so clean the EGR valve.
And I would also want to test the fuel pressure.
Van
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| Comment | You were dead right; it's actually a 4 wire oval shaped connection that is on the top of the heater assembly behind the glove box. I'd seen that but thought it was a temp sensor or something. I'd gone to the dealer and bought that resistor module thing ($21), but after taking the old one out it looked fine (none of the elements were broken) but after replacement, voila, everything fixed. Thanks; you were great. Have a good weekend! -Mark | ||
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Van
Expertise
I have been maintaining a fleet of approximately 55 light, medium and heavy vehicles for over 20 years. Most are 4X4 pickups and off road fire fighting trucks. Some medium duty trucks. Some military light trucks. I can answer most questions concerning 4X4 engine, drive line, suspension, electrical, and fuel, both diesel and gasoline. Ford, GM, and Dodge, old and new, but prefferably not newer than 99.
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