4.0L intermittent rough idle

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Feb 13, 2007 | 06:52 AM

huckster

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4.0L intermittent rough idle

I have a '06 Explorer with 6,000 miles on it that has developed a rough idle that comes and goes. It will idle smooth as can be for a few minutes, then start shaking like it lost a plug or a vacumn leak. Then after about 30 - 60 seconds it smooths out again. It doesn't seem to matter if the air is on or not , in gear or not,etc. I haven't been able to determine a "trigger" for the rough idle. Has anyone experienced this or can explain whats happening?
Thanks, Huckster

Feb 13, 2007 | 10:30 AM

aquanaut20

Cargo Master

Joined: Aug 2003

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From: BC Canada

Have the dealer put it on a scope (under warranty), sounds like it may be an electrical induced problem.

Feb 15, 2007 | 08:26 AM

huckster

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problem solved

Turned out to be the mass flow sensor. Dealer replaced it and it's doing fine. Thanks, huckster

Feb 21, 2007 | 09:42 PM

huckster

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problem is back!!

I'm taking it to the dealer tommorrow. The rough idle came back worse than ever. I'll post what I find out. huckster

Feb 23, 2007 | 08:17 PM

huckster

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bad news

The dealer had it for a day and a half and said their tech. couldn't find anything wrong with it. If it was my job to troubleshoot and repair $20K+ automobiles, I wouldn't admit to not being able to tell something is wrong with it when it's running like this one is. I'll drive it some more and take it back when it gets worse. If that's possible. I've got a bad feeling about this.
Huskster

Feb 23, 2007 | 10:08 PM

aquanaut20

Cargo Master

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From: BC Canada

make sure they fill out a sevice ticket and get a copy, CYA

Feb 23, 2007 | 11:03 PM

rrgone

Tuned

Joined: Feb 2007

Posts: 288

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From: SW Florida

Kinda sounds like a plugged fuel filter or pump/controller going bad. Definately get it back to the dealer to diagnose and fix. Lord, only 6K miles...