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
03R44Edge's Avatar
Thread Starter
Join Date: Jun 2010
Location: WA
Posts: 31
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
Join Date: Jul 2010
Location: Arkansas
Posts: 76
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
jtfoxman's Avatar
Join Date: Jun 2005
Location: The Poconos
Posts: 891
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
k.blakeley's Avatar
Join Date: Apr 2007
Location: East Texas
Posts: 2,823
First thing you need to do is have the code pulled.
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Old 04-03-2012
03R44Edge's Avatar
Thread Starter
Join Date: Jun 2010
Location: WA
Posts: 31
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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