Erratic Idle & CEL? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-22-2010
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Erratic Idle & CEL?

Check engine light has been on for a while & idle speed is erratic/ & fluctuates on my 03 Ranger 4.0 5 speed manual.

I would also say that fuel economy is down but could be seasonal?

It's all stock & approx. 65 K original miles.

Any leads / tips are appreciated.
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Old 12-22-2010
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First check your EGR system: The EGR tube, EGR solenoid, EGR valve, and all hoses connected. I would clean the tube and hoses and buy the other two.

Bad mileage would probably be the purge system: Purge canister valve, purge solenoid, purge canister, and hoses.
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Old 12-22-2010
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Wirelessly posted

Get your CEL code read at most auto part stores and see what's goin on.
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Old 12-22-2010
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First thing you need to do is have the code pulled.
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Old 04-03-2012
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Update......from last summer

Had the codes read & it pointed to both oxygen sensors.

I replaced BOTH & no change.

Tried throttle position sensor & also made no difference.

Had a recall from Ford on the cruise control & the Ford tech gave me a FREE diagnossis:

He found a perforated vacuum line.

A $12.00 molded hose at the parts store & 10 minutes later we were GOOD to GO!

My hat is OFF to the local FORD dealer............THANK YOU!
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