Engine rpms fluctuate while driving at a constant speed if I let off the gas and resume it then evens out just had a code p02004 which was the control runner had that changed it didn’t fix the rpm problem. What can cause this?
Keywords:F150
Engine rpms fluctuate while driving at a constant speed if I let off the gas and resume it then evens out just had a code p02004 which was the control runner had that changed it didn’t fix the rpm problem. What can cause this?
The IAC – Valve controls the idle. Generally when there is idle surging it is caused by a vacuum leak. Could be a hose or gasket.
Code P2004 Reference:
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2004 Ford – Intake Manifold Runner Control Stuck Open Bank 1
The P2004 is set when the Intake Manifold Runner Control (IMRC) is commanded closed by the Powertrain Control Module (PCM), but the IMRC indicates open.
Possible causes
– Intake Manifold Runner Control (IMRC) monitor signal shorted to power
– Faulty Intake Manifold Runner Control (IMRC) actuator
– Faulty Intake Manifold Runner Control (IMRC) solenoid
– Damage Powertrain Control Module (PCM)
– Blocked vacuum hoses
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