Check Engine Light
Grand Prix GTP
1995-2005 Chevy Cavaliers

Car hesitates check engine light stays steady or blinks when giving gas had a tune up done and replaced bad gas any other ideas of what this could be what's a v-tech sensor?

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January 04, 2007 2:30AM

BAD FUeL FILTER. BAD THROTTLE POSITION SENSOR. BAD MAP SENSOR. LOOK, GO TO ANY OF YOUR AUTO REPAIR STORES LIKE AUTO ZONE AND HAVE THEM HOOK UP A DIAGNOSTIC READER TO YOUR COMPUTER SYSTEM , NO COST TO YOU, AND SEE WHAT IT READS OUT. YOU CAN BUY ONE OF YOUR OWN FOR UNDER 40.00 HANDY THING TO HAVE AROUND FOR ANY CAR YOU PLAN ON KEEPING. GOOD LUCK. Pull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self tests the computer runs the car through a drive cycle, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related. OR hook up a scanner that is capable of clearing codes, and hope that none are still active. The " check engine light" is by far one of the most misunderstood technological advances It is a warning light that is illuminated when there is a problem affecting the EMISSIONS of the vehicle.. Don't let it bother you as it is a good thing once you understand it. One point that was brought up a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say a small percentage of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have multiple computers aside from the powertain computer) will run a series of self-tests. They will only run under certain criteria. And they are different from manufacturer to manufacturer. Some self-tests or