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Discussion Starter #1 (Edited)
Hi all. Hoping you all can help help with this problem. Ive been all over the net and this awesome site with no luck with finding a cure or others with this same symptoms. So here we go. We have a 2002 Dodge Durango with 4.7 automatic tran. A week ago the battery blew the negative post lose from the case when my wife started the the vehicle. I have since replaced battery and went to start said vehicle, it starts and goes WOT 5000-5500RPMS. It does don't kick down or can it be manually kicked down. I have tested TPS and cleaned IAC. I get no codes or they where all deleted on new battery replacement. I'm wondering if a bad Power Steering Psi Switch stuck open can cause such a high idle/WOT? I do believe that it was going out as some times during slow maneuvers the Durango would stall, but not all the time. It was driven into the garage the night before at slow speed so I'm guessing the power steering pressure switch was working and open and is now stuck open. Just a thought, other wise im thinking, during the battery shorting and exploding it shorted out the parts of the PCM that control idle.
I can not test the sensor or risk working under the hood at WOT
TIA Arcticowboy
 

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Have you checked the Throttle Plate to make sure its closed?
Engine can't go to WOT without air going into engine which is through the TB and the Throttle plate has to be open.
All of which is cable operated.
Pull the intake tube off and verify its closed.
 

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Discussion Starter #3
I have with the engine not running; the TP, I call it a butterfly. That's where I'm baffled. As the only other cable that is connected to the Throttle Body is the cruise control. I did for a bit think the cruise was malfunctioning
 

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I was gonna say, the IAC usually isn't big enough to allow enough air in for it to run WOT. Something is holding that throttle open. Disconnect the cruise control and see if it still does it
 

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sounds like a large vacuum leak somewhere.. throttle is mechanical on a 2002, so unless the cruise control servo is hosed and driving the throttle open (you can disconnect that at the bellcrank on the TB) I don't think there is much the computer can do.. and as others have said I don't think the IAC can pass that much air.. you could put a piece of strong duct tape over the idle air passage in TB throat and see what happens..
 

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Discussion Starter #7
Thanks all. I will try the tips today and see what happens and get back and let you all know what happens. Fingers crossed as being down to one car really sucks.

*I will be disconnecting cruise and re checking for vacuum leak and looking IAC.
 

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Discussion Starter #8
UPDATE: Problem Found!!

Hi all just wanted to give you all an update on wife's durango. I had to take break from it, as it was driving me crazy. So anyways when I got back to it the first thing I did was start checking all the the vacuum lines again, and found no problems with them. After doing so I was about to call it a day when something caught my eye.
As you may know the intake manifold is plastic and on the the back of the manifold is a cover right against the firewall where the pcv lines run to the oil filler neck.
Anyways the cover was not attached to the intake and left a very large opening and it was just sucking in a large amount of air causing the WOT on startup (5500 RPMs).
Haven't removed the intake manifold yet, didn't want to tear it apart till I had the replacement intake and gaskets.

Does anyone know if this cover is pressed fit or glued in place? And can I fit intake from other years?
 

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2002 intake manifold appears to be unique to that year.. I don't know what the differences are..
same manifold on ram/dakota/GC that year.

expensive (and discontinued) part, you may have to JB Weld it.
 

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I believe the 2002 model year 4.7L HO intake is the preferred one which is also the same intake used on all 4.7L in 2003 and 2004.
So that is what I would search for first.
But you can use any OEM 4.7L intake from 1999-2007.
You can also use the newer 2008-up 4.7L intake but you need a TB adapter which is available in the aftermarket.
 

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Here is some more detail on the different intakes taken from AirRam site. AirRam - Cold Air Induction System

The original 4.7L's had 510mm intake runners. The HO intake when it cam out had 415mm intake runners. When the intakes were made common in 2003-2004 all 4.7L's got the 415mm HO intake runner lengths.

The 2008 4.7L intake has 350mm long intake runners and it will make the most HP of any 4.7L intake manifold. The 2008 4.7L cams are also good for over 305 SAE corrected flywheel HP.

The 2011 design is the new replacement intake for all 2008 & UP 4.7L engines. It appears to be very close in design to the 2008 intake with just a few subtle differences. The overall size of the two intakes appears to be the same although the 2011 appears to have smoother transitions with the absence of plugged holes left from manufacturing. They both share the same vacuume ports and EGR ports in the same location... all in all the 2011 appears to be an improvment in design over the 2008 intake. We cant say if there is a HP gain or not quite yet.

The original HO lost core design flows more air and makes more power than the later common shell mold design, even though they both have 415mm intake runner lengths.

Original 4.7L SO intake has 510mm (20.0787 inches) intake runners and is a lost core design.

Original 4.7L HO intake has 415mm (16.3386 inches) intake runners and is a lost core design.

Common 4.7L SO/HO intake has 415mm (16.3386 inches) intake runners and is a shell mold design.

2008 4.7L intake has 350mm (13.7795 inches) intake runners and I'm unsure of the exact design.

The shorter the intake runners the stronger the top end HP. The HO intake manifold with it's 415mm long runners falls on it's face above 5200 RPM.

The 2008 4.7L intake manifold with it's 350mm long runners will pull strong to 5600-5800 RPM (not exactly sure of the final rev limiter.)
 
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