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Very high idle

Very high idle

Postby cthudak [OP] » Dec 07 2011, 7:20pm

Hi great forum...first post
I have a 2000 chevy silverado with a very high (1500rpm) idle. I get a P0507 DTC. This is what I have done to date: Replaced IAC, MAF, TPS, Fuel pressure regulator, PVC valve. If I goose the throttle cable by the throttle body it revs to 2500 rpm then comes back down to 1500 rpm. It does this whether truck is cold ar warmed up. I found no vacuum leaks, in fact I can take the vacuum line off the fuel pressure regulator and the idle speed stays the same. I get 65 psi at the fuel rail at idle. Any ideas???

Thanks for the help
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Related Topics  high idle in gear   High Idle on start up   High idle and hanging rpms after let off   Engine stuck in high idle   erratic shifting, high idle   Idle Air control valve causing rough idle?   High mile 5.3 misfire   High Mileage 5.3 - Which Oil   oil PSI HIGH?   Hesitation At Idle   Idle issues   Shaking at idle   Fluctuating Idle   engine idle 
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Re: Very high idle

Postby ASTE25 » Dec 07 2011, 10:14pm

I would check to make sure the throttle body is not hanging open slightly due to carbon buildup.
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
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Re: Very high idle

Postby amberlynn » Dec 08 2011, 2:37am

Is the truck a throttle body? My Pontiac Firebird 305 TBI had a high idle that no one could figure out..I paid $2.61 and replaced the throttle body gasket and it fixed the problem perfectly..the gasket had disintegrated and created a vacuum leak. I had checked the IAC, Coolant Temp Sensor,and all vacuum lines before I tried the gasket...
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