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Old 06-01-2011, 09:26 AM
1988ranger 1988ranger is offline
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Join Date: May 2011
Posts: 17
Default Need idle help 2.9 L

i just changed plugs and wires on 2.9L my idle was 900 before and now it is 1300 the book says 800 rpm idle i checked all the vacuum hoses
no leak the only thing i did other then the plugs and wires was took throttle body off sprayed carb cleaner there i have already changed the pcv valve when i got the truck ..any suggestions would be appreciated.. trying to get through inspection H/C flunked
thank scott

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new cap , rotor, plugs , wires , air filter ...
pcv valve,
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Old 06-01-2011, 12:57 PM
Psychopete Psychopete is offline
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Join Date: Jun 2009
Posts: 1,488
Default Re: Need idle help 2.9 L

Sounds like a vacuum leak for sure, the symptoms you have sure fit well. Did you reuse the TB gasket? Did you reconnect the 2 large vacuum lines and 1 small evap line that go to the bottom of the TB? Spray anywhere a vacuum leak could be, particularly around the throttle body and see if the engine idle surges. It's possible the gasket is not sealing if re-used.

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