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Old 09-16-2011, 12:04   #1 (permalink)
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4.0 stalls in N and P when warm?

Over the last couple years my 2001 4.0 4x4 seems to idle a bit slow when I shirt to N or P. I recently chased down a PO401 code (swap out the DPFE-EGR was fine). I don't think the 401 was related. Ran fine w/ the code, runs fine w/out.

Seems now that if the motor is warm, if I shift through N or P w/out feathering the throttle she stalls out. Idle is smooth, if I inch the throttle a bit, but but even when i park and slide the shifter through N it will stall before I get to park.

I cleaned the MAF sensor, no effect. If the motor is cold it idles in N and P fine. There are no error codes. When I unplug the battery (reset codes) I think it runs fine for 10-20 miles, but then gets grumpy again (may be that it just warmed up and now stalls-not sure yet).

Maybe voodoo vacuum stuff? Anybody seen it?
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Old 09-16-2011, 12:18   #2 (permalink)
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Re: 4.0 stalls in N and P when warm?

Tried cleaning idle air control valve ?
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Old 09-16-2011, 12:31   #3 (permalink)
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Re: 4.0 stalls in N and P when warm?

Not yet but I'll give it a go. Thanks for the tip. I will post results. Carb cleaner or something more fancy? Just bought a can of MAF cleaner...
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Old 09-16-2011, 12:35   #4 (permalink)
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Re: 4.0 stalls in N and P when warm?

Sensor cleaner / electrical cleaner /maf cleaner all o.k , if there is a lot of carbon build up in there it may take a few sprays .
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Old 09-21-2011, 12:00   #5 (permalink)
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Re: 4.0 stalls in N and P when warm?

I cleaned the idle air control valve pretty well w/ MAF cleaner. Seemed to do the trick for a couple hundred miles. Crusty fine dust on the upstream side and greasy carbon buildup on the downstream side. After a good weekend trip in the hills the idle seems to be slowing down again. iI was a bit ginger w/ the MAF cleaner, maybe I will pull it off again and really saturate and clean it out well.

Maybe a better cleaning will do the trick-it deffinately solved the problem for a while. Thanks again for the suggestion.

I had a buddy suggest the foward O2 sensors, as the condition only arises when the motor is warm. There are no error codes at all. I will reclean the idle air valve 1st. Alot cheaper then throwing o2 sensors at it and hoping.
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Old 09-21-2011, 12:18   #6 (permalink)
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Re: 4.0 stalls in N and P when warm?

Well worth giving the idle air control valve another good clean out as you suggest .
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