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Rpm problem

 
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Old 19 May 2018, 12:05 pm
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Default Rpm problem

I have a 2003 gt automatic , the car started picking up speed , if while driving at lets say 40 mph and I slip it into neutral the rpms pick up from 2000 to 2500 , sometimes it feels like it"s on cruise control, I did replace the throttle position sensor and it seems a little better, any ideas ?
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Old 19 May 2018, 01:17 pm
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Default Re: Rpm problem

Sounds like a vacuum leak to me. Did you knock a vacuum hose loose on the back of the engine? There are a few in the area of the throttle body and as they age, they get brittle. I'd take a look at them.
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Old 19 May 2018, 04:54 pm
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Default Re: Rpm problem

took some carb cleaner and sprayed around the vac lines , throttle body area, and then the intake manifold and nothing showed up on top the engine, theirs no missing or hesitation
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Old 19 May 2018, 05:55 pm
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Default Re: Rpm problem

How is the rpm's at an idle?

If you have a vacuum gauge see what the vacuum is doing as you increase the rpm's.
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Last edited by ptcruisersteve; 19 May 2018 at 06:01 pm.
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Old 19 May 2018, 05:58 pm
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Default Re: Rpm problem

hangs around 1000
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Old 19 May 2018, 06:10 pm
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Default Re: Rpm problem

i would suggest checking to see if the PCV hose is loose at the intake manifold and also the PCV.
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Old 19 May 2018, 07:04 pm
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Default Re: Rpm problem

hoses looked good and I tested the pcv valve and it's working, I did run a test with the cruise control and after I set it the car gradually picks up speed, especially if I'm going down hill, I haven't had any engine codes
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Old 19 May 2018, 09:09 pm
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Default Re: Rpm problem

Could be the exhaust be blocked or the converter is shot.
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Old 20 May 2018, 06:06 am
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Default Re: Rpm problem

I'll get that checked out
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Old 24 May 2018, 04:40 am
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Default Re: Rpm problem

I'd replace the PCV valve with a factory part, especially on a turbo car.
Check for a vacuum leak at the brake booster.
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