uneven idle

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May 28, 2015 | 10:10 PM

jerryparks

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Tuned

Joined: May 2014

Posts: 317

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From: Richmond, VA

uneven idle

When I first start my truck, it has a tendency to rev. After it's warmed up a while, it evens out. But it always revs once it's started. I have a vacuum hose disconnected...err...broken under the hood. I'm wondering if that's it. It was a red/pink color.

May 28, 2015 | 11:24 PM

Da_Lariat_Chariot

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Joined: Feb 2015

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A broken vacuum hose will definitely mess with your idle ...

What is your idle RPM at once it warms up?

May 29, 2015 | 08:27 AM

jerryparks

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Joined: May 2014

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From: Richmond, VA

Don't know, no tach. But it's lower than when it's reving.

May 29, 2015 | 08:35 AM

timbersteel

Logistics Pro

Joined: Mar 2005

Posts: 4,698

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From: Mexico, Missouri

Quote:

Originally Posted by jerryparks

Red vacuum hose is routed to the FPR.

Pink hose runs to the Air Diverter/Bypass valve for either the TAB.

If its the red, then fuel psi stays pegged out, and you have a consient vacuum leak. If its the pink line, then you have a vacuum leak when the PCM commands the TAB solenoid to function.

Still.......a vacuum leak....