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When I shift into neutral in my 2004 2.0L manual Ford Escape, the RPMs hover at where they were at when I was in gear, and then increase/hold at ~3000 RPMs for about 5 seconds before decreasing.

I replaced the IAC valve since this was the most common solution for this behavior I saw on threads, but the issue persisted.

I did notice after replacing the IAC valve that the issue doesn’t start until the car warms up. Everything works great when in gear.

I checked for codes but there weren’t any. I performed some tests with the code-reader and the only one that failed was the alternator text (voltage too low at 11.5). Would this be a cause? Or just another issue :D

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This is a common symptom of an air leak in the crankcase ventilation system. Check the rubber hoses for soft areas and splits.

If this is a zetec engine there is likely a hose running behind the inlet manifold that is prone to splitting and can cause this issue.

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  • Forgot to circle back earlier -- a cracked/leaking vacuum hose.
    – sandeman_13
    Commented May 16 at 0:16
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Some ecu's will limit engine rpm to 3k in it is not in gear and connected to the drivetrain.

Done to limit the engine hitting max rpm without load.

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