Question about Chevrolet 1500

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The engine lite go on, we replace the oxygen senser when you go at a speed of 60to 70miles it comes on when the truck is cold no light, we did replace other things but the lite will come at a high speed

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Have you scanned the computer to see what the code is? scanning it will better help to understand what is going on. if it is a 1996 or newer auto zone will scan it with there scanner for free.

from experience with gm cars and trucks if the light comes on at high way speeds it usually has something to do with the egr system.

but you can't be sure what part of the system is malfunctioning until you get it scanned but i am sure you will find it has something to do with that system.

good luck

Posted on Oct 05, 2009

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Is the catalitic convertor still in the exhaust if not this will cause your problem,if it is then it could be getting weak

Posted on Oct 05, 2009

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If there is an AUTO ZONE around your area, have them scan the truck for any DTC codes which would help us understand why there is a check engine light at high way speed. It could be a misfire to transmission problem, to having the engine run lean or rich to a faulty fuel pressure regulator. Good luck and keep me posted, be glad to help get your truck running 100% again soon. 

Posted on Oct 05, 2009

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