Question about 2008 Pontiac Vibe
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Posted on Jan 02, 2017
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
SOURCE: throttle position sensor
Sounds like you have a vacuum leak somewhere on the engine. If the tps was bad, it would set a code and the check engine light would be on. Also, check your air tube that goes to your throttle body - make sure the hoses are connected tight and the tps is on the throttle body down on the front of your engine where the hose runs down to it. It's not really that hard to get the throttle body off. That would be the best way to change the tps - to take the whole throttle body off and put new gaskets on and tps on it. Hope this helps you out. PHil
Posted on Jan 16, 2009
The OBD II code for P0400 is Exhaust Gas Recirculation Flow Malfunction.
I'm sure the only thing you have left is you may have to replace the EGR valve or check for any leak from the vaccum lines going to to EGR valve.
Posted on Jun 01, 2009
im fixing what seems to be the same problem on my 92 grand prix try listening for a vacum leak when the engine is warm. my problem is the brake booster is leaking. when i come to a stop it almost stalls. i dont know if that will fix your problem but from my experience the grandprix's thats my guess. if im wrong look in the fuel injectors
Posted on Sep 30, 2009
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