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The only thing I could figure was it acted like you where turning the switch on and off..........

The dash controls. I noticed the surge during testing the defroster fan was off but it was not. replaced it with a junkyard unit and the surge went away. I found this after I recharged the AC system from a recommendation elsewhere.

Well I got this figured out. it turned out to be a bad heater control unit.

I left the truck battery disconnected over night to reset the ecm, after I work today I will reconnect, let idle for 15 minutes and retest.

OK after much testing, I dont have a vacuum leak, I just replaced the IAC and still no change. Anyone have any Ideas?

have not tried a fuel gauge its in AZ and Im here in WA. I have removed and cleaned the IAC and the MAF Did the test again and still got the 538 The weird part is that while the tester is on and connected the idle is perfect.

anyone...........have I stumped the entire explorer world?

KOEO 539, KOER 412, 538 The engine surges at idle. I can remove the IAC plug and it does not effect the surge much, I can disconnected the MAF plug and the surge mostly goes away. IF I disconnect the TPS it has no effect. I have sprayed around the vacuum lines and carb cleaner and no...

17" boyds 225/45/17 Hankooks not on the truck yet, still working on lowering it and a disc brake conversion

Here's your sign

I floated an XJ a few years back.........not much fun but luckily a few yard down the stream it hit bottom and was able to climb out to the other bank...........Thank GOD for lockers and tall narrow tires!

That video is priceless! LMAO.. gotta love the counter balance to get the tires back to the bottom:thumbsup:

Don't get me started on ASE certified mechanics. LOL! I know some who could not even do a tune up damage pics: The way that the water and oil are mixed there on the floor it appears to me that the motor had run awhile with water in it to get the milky oil, or am I wrong?

Thats what Im thinkin here is that he ran through a major puddle and sucked up and filled the airbox. I just cant see how the physics could happen.

Hey All I've been watching and lurking here for years I now own a MAZDA B4000 extended cap 2x truck that I am going to be dropping and cleaning up the trim abit. Great site! I have in the past built many XJ off road rigs. Im thinking I need a new challenge and a ranger or explorer...

I was on another site and someone posted that he was going through an automatic car wash and he said the motor quit while going through the carwash and it would not restart and caused Hydrolock To me this does not seem possible. the amount of water that an under carriage wash uses is...