Question about Ford Bronco

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1990 ford bronco, full size, 5.8 liter auto 4x4. idles high, replaced idle air control with an oem part, no change in idle. please advise. have also changed out the egr valve.

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  • edward lai Apr 02, 2011

    thats alot to go thru, but thnk u

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  • Ford Master
  • 7,726 Answers

Hi, for the truck to idle high, there must be air getting into the engine that shouldn't be. One obvious thing to check is the throttle plate. The throttle should close almost fully. The throttle cable should also be a little loose with the throttle plate fully closed. If the throttle is closing OK, then look at other ports that can let air into the engine downstream of the throttle. These may include the EGR port, the PCV port, the EVAP purge port, among others. Though you have changed the EGR valve, check to make sure the solenoid valve isn't stuck open, which would allow vacuum to keep the EGR valve open. You can check this by simply disconnecting the vacuum line from the EGR valve to see if the idle will come down. You can take the same approach with the other ports--remove each hose attached to the intake manifold and plug the port with your finger to see if it makes a difference. If none of the ports, when blocked, will bring down the idle, then you have to suspect an intake manifold gasket leak. You can check this by spraying carb cleaner on the gaskets while the engine is running. If the engine speed changes at all when the gaskets are sprayed, you have a leak. If you have any questions either before or after making these checks, please let me know and thanks for using FixYa.

Posted on Apr 02, 2011

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