Car revs high.

Asked by Jun 23, 2017 at 01:38 AM about the 2008 Pontiac G5 SE Coupe

Question type: Maintenance & Repair

So I bought a throttle body cleaner and on the side of the
can it told me to take off my entire air intake system and
turn on the car and have someone press the gas pedal to
move the flap so cleaner can get in. I tried to turn the car on
but it started for around 2 secs then stalled out I tried it
again and the same thing happened so i just manual
pushed the flap with my fingers and cleaned it. I put
everything back together and started the car. it revved 500-
1000 more then it usually does and when I put it in Drive it
doesn't crawl, it feels like I'm pushing the gas a bit. And the
throttle is very laggy  I push the gas then let go but the revs
still stay at position for around 2 secs then they go back
down slowly.

Is this because my MAF sensor didn't sense any airflow
when I took off the intake and turned on the car and now
it's overcompensating for it ? How do I fix it ?

3 Answers

18,655

May need to reset the computer but IAC may still be dirty, I take throttle body off, then remove the IAC and use CRC throttle body cleaner and a bunch of different size & shape nylon brushes to clean and reinstall them with new gaskets. Did you touch the MAF with your fingers or anything else and did you disconnect them and forget to reconnect and is the check engine light on?

18,655

You should not of done that type cleaning as the sensors and computer read it as the air leak (into engine) like a intake gasket bad. Make sure you got the intake back together and air tight. All air has to pass by the sensor or it will run bad, and also you may have a vacuum line off somewhere.

18,655

All engines with a MAF & IAC you never clean with the engine running. You can in most cases clean the MAF with MAF cleaner without removing it if you can see the filament and you never touch the filament either but you have to remove the throttle body & IAC valve to clean them. Make sure all the electrical connection are back together tight too and clean correctly and reset computer, I am sure if it was not on the check engine light is on now.

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