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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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Old 06-06-2008
jimmclrk1's Avatar
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I am: James Clark
Join Date: Nov 2005
Location: Atlanta, GA
Vehicle: 2002 Ranger XLT
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From drive to park, truck dies...

I did a search, found a couple started threads that never came to a resolution.

I have a 2002 with the 4.0. Within the last month or so the truck has developed a habit of dropping to extremely low RPM levels when shifted from drive into park. There are a few other "clues" that may be of assistance in uncovering the cause of this failure. When the truck is dropping RPMs, there is an whining sound that accompanies the truck's death. Also, if the A/C is turned on, the truck dies much less frequently, as the RPMs maintain a higher level. Lastly, if I tap the gas pedal as the RPMs are dying, it corrects the problem, and the truck won't die.

The problem tends to occur after 15-20 minute trips of stop and go driving, and I am not slamming the truck from drive to park. In fact, I generally wait about twenty seconds between parking, and shifting into park, hoping that the truck will be able to make the change without dying. Any help would be appreciated, as I have no idea where to go from here.

The truck may need a tune up, as I have owned it for about 25k miles since buying it (currently ~90,000). Any other suggestions would be greatly appreciated!

2002 2wd XLT
4.0L V6
X-Cal tuned by Bamachips
K&N FIPK II intake
Cherry Bomb duals out the back
3" Doetsch spindles and 2" Doetsch Springs up front, 3" blocks and 1.5" AAL's in the rear, and a 3" PA body lift all around
Toyo Open Country A/T 33's
Ford Racing 4.10's

Soon to be: Powertrax Lockright, all tube front and rear bumpers, and 34" Swampers
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Old 06-06-2008
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It may be time to clean your IAC valve.
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Old 06-06-2008
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I am: Evan m
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that would be cool. just throw it in park and its already turned off. one less thing to do.
clean iac and maf. may help
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Old 06-17-2008
I am: Vince Wright
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Check the IAC valve Ive also seen a bunch that suck the PVC tube runs along the back of the intake from one side to the other. Over time it just gets old and sucks shut or develops cracks and can cause that exact problem.
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