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Will the erg valve cause high rpm at idle than drop back down to 750 rpm..89 probe 5 speed?

Yes, a faulty EGR valve can cause high RPM at idle, which then drops back down to 750 RPM on an 89 Ford Probe 5 speed.

A properly functioning EGR valve helps reduce emissions by recirculating a portion of the exhaust gas back into the engine's intake. When the EGR valve fails or becomes stuck open, it can cause a lean fuel mixture, which can lead to high RPM at idle. Once closed a normal idle will resume.

Here are some symptoms of a faulty EGR valve:

1. High RPM at idle

2. Engine knocking or pinging

3. Reduced fuel efficiency

4. Emissions failure and check engine light

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