06 Chevy engine light on computer sayin tightin fuel cap?

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Any large vapor leak in the fuel system will make it read gas cap. Check all of the hoses around the fuel tank.
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Your 1989 Chevy truck 2500 V8 5.7 engine has lost a lot of horsepower you've already changed the spark plugs dist cap rotor air filter put in fuel cleaner Fuel filter is also new What can you do next?

Make sure the catalitic converter is not plugging. They are usually good for about 100000 miles.. Replace the oxygen sensor. It's on the exhaust on the passenger side. There will be 1 wire going to it. It's a black wire. Make sure you soak it good with a liquid wrench or something. The threads are (MORE)

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Chevy check engine light?

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Does a 1986 Chevy truck have an engine computer?

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Diesel fuel is ignited by a combination of heat and compression. The heat is caused by the very high compression in the cylinder. The fuel also has to be very finely atomised to be able to burn.

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You can. 1. repair what is wrong with the car and wait for the computer torerun tests. 2. use a scan tool to clear the codes. 3. disconnect and reconnect the cars battery for a minute or so andthat will clear the codes. #2 and #3 will only clear it until the system reruns tests, if theissue still ha (MORE)