Question about 1998 Pontiac Sunfire
The car idles great, but will not increase rpm. It will not go over 1300 rpm either with pedal or manually. We have changed the air filter, plugs, wires, fuel filter. Had a compression test done, as well as exhaust flow, passed both. Has a new Throttle position sensor and coil as well. Any ideas.
I assume that you do not have a "check engine" light?
The next thing I would do is check the pressure from the fuel pump. You can have this done at your preferred garage, or by purchasing a fuel pressure gauge from any parts store.
Vent the fuel tank vapors by loosening the fuel cap. Remove the electric fuel pump fuse and start the engine. Allow the engine to run until it runs out of fuel and stalls. After spinning the engine over for a period of 3 to 5 seconds, turn off the ignition switch and install the electric fuel pump fuse. Next, install a fuel pressure gauge in the fuel rail supply line, and secure the fuel tank cap. With the ignition key in the on position, verify that no leaks are present and start the engine. Visually verify the PSI reading on the gauge. The pressure for your vehicle should be 41-47 PSI (Pounds per Square Inch). Hope this helps and good luck!
Posted on Jan 13, 2009
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Posted on Jan 02, 2017
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