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

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Old 08-09-2012
Thread Starter
Join Date: Apr 2010
Location: tryon nc
Posts: 75
Idles @ 2100 RPM

I just replaced an oxygen sensor since that was the code that the guy at Advance Auto said it needed. It still idles high and sometimes it barely idles. The CEL is off but not sure what to look for next. Could it be the throttle position sensor?
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Old 08-09-2012
bfd's_ranger's Avatar
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Join Date: Feb 2010
Location: Vancouver island B.C.
Posts: 225
Try unplugging you iac valve.
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Old 08-14-2012
Thread Starter
Join Date: Apr 2010
Location: tryon nc
Posts: 75
I unplugged it and it wouldn't idle at all. Not sure what this means though? Around the same time this happened the air conditioning started blowing through the defrost ducts only. Don't know if it may be related to just coincidence.
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Old 09-08-2012
patkelly1336's Avatar
Join Date: Mar 2011
Location: Elm Grove, Wisconsin
Posts: 209
The Ford Ranger by design idles high on cold and warm start for a certain period of time. During the winter months my Ranger idles at about 2200 RPMs on cold start and then holds at about 1500 RPMs after 5-6 seconds. And if you have the defroster on, the A/C compressor runs by design and usually causes the engine to idle higher. And if that doesn't help, check for a vacuum leak or any signs of MAF sensor malfunction, because if it is idling high it could be not getting proper airflow readings, causing it to run rich and idle high. I don't know exactly
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Old 09-13-2012
Join Date: Sep 2012
Location: Buffalo , NY
Posts: 7
Yes I would say it is mine did the same thing I have a 94 4.0 5spd and when at idle it would drop to under 500 rpms and almost stall then would spike to 1200 rpms but I haven't seen 2100 rpms I would try the throttle position sensor after I changed mine it ran fine it still idle'ed funny but much much betteri still have to replace the MAF sensor. Sensors are junk on these fords my check engin was on for 3 things all sensors haha
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Old 09-21-2012
yamarider88's Avatar
Join Date: Mar 2012
Location: St Clairsville, Ohio
Posts: 40
i replaced my iac and the tps and it fixed the problem...mine was idling at 2500 and would nvr go below
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Old 09-24-2012
Kris03's Avatar
Join Date: Jun 2011
Location: glastonbury, ct
Posts: 1,236
Ya i was going to say IAC for sure. If u unplugged it and nothing changed it wasnt doing its job.
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Old 09-25-2012
87xlt's Avatar
Join Date: Jun 2008
Location: In my truck!
Posts: 875
Before you start throwing parts at it check for vac leaks first!
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