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:oops: Got a 1995 Silverado whose service engine soon lite just came on. Along with the lite came an increase in engine idle speed (600 rpm to 1200 rpm) and the automatic tranny bangs into gear so hard it pushes me back in the seat. The other gear shifts are progressively gentler but still harder than normal. Online I was told the shifting problem was caused by a faulty TPS (throttle position solenoid) which I changed but all remains the same.

Any advice as to what to try next?

1995 Silverado 5.7 l, automatic, 2-wd, C-2500 has a set of headers and a towing cam, can't seem to locate an O2 sensor but the truck, until last week, ran perfectly fine.


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you're going to need to scan the computer for the code. when the service engine soon (SES) light comes on a code is usually stored in the computers memory. Most cars or trucks will run differently when the SES light is on. It runs differently because instead of using the inputs the computer usually sees to make everything run normal it will put in a substitute value for the input that it sees as not being right. Of course the value it makes up is not really correct, it is just a value to keep the engine running so you don't get stranded on the road somewhere. So, scan for the code and start from there.

as for the symptom, higher than normal idle, can be a few things. when you scan for codes look at your fuel trims, your O2 sensor and your idle air control (IAC). you could have a vacuum leak that will make the computer add fuel to keep the O2 sensor happy. (which means the idle will go higher because more air and more fuel)

Do you know what the code is for the check engine light?


   
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