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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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  #1  
Old 10-26-2015
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high idle help

idles about 3000
changed iac and throttle positioner
checked cables for binding
any ideas where to look next?
check engine light is not on

2002 4x4 4.0, 5 speed
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Old 10-26-2015
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i am new to the 4.0 but when i had a 4cyl with a high idle it was a bad pcv valve that was the culprit. it did not throw a code at all when this happened.
good luck
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Old 10-26-2015
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Yes, reads like a large vacuum leak.
Start removing hoses on the intake and then plugging that intake port, when idle drops follow that hose to find the leak.

Yes, PCV valve hoses on the 3.0l and 4.0l are a known issue, they crack and leak at the elbows, underside where you can see it very easily.
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Old 10-26-2015
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thanks guys, I will look into that and let you know, it will be a few days before I can get to it
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Old 11-08-2015
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found a crack at the elbow, did lower rpm some, but, still around 2000-2500.
was determined iac valve is defective at this point
what I did for now was made a gasket for the iac valve from a plastic oil bottle and drilled some holes in it and now my idle is about 650 when warmed up, will not idle cold, but, does not take long to warm up

this will hold me over until I get a new iac
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Old 11-08-2015
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Thank for the update
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