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Old 03-14-2011, 01:31 AM
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WJ dies when I put it in park.

Hey guys so this is my first post here, but I've been looking around the site a while and it's AWESOME.

I have a 2000 WJ with the 4.7 V8 79k miles. Runs and drives great..no issues at all but sometimes (especially when it's cold outside) even if the engine is hot the engine will idle down so far that it will die when I put it in park. I've only had the Jeep a few months now and it's only happened 2 or 3 times but does anybody have any idea what it is? After it happens I can restart it right away and it will start right up and run perfectly. It's not a huge issue but any help would be appreciated.
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Old 03-14-2011, 05:50 AM
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Re: WJ dies when I put it in park.

Welcome to the garage.
When you say that the engine idles down, will this just start happening at the moment you put it in park, or was it already going down? The idle speed is controlled by the IAC stepper motor on the throttle body. If you also have rough idling, the problem can be in a dirty IAC plunjer and air passage.
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Old 03-14-2011, 08:16 AM
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Re: WJ dies when I put it in park.

Normal idling is fine. I forgot to mention..it usually happens after I had just been driving. Like I had JUST come to a stop and I put it in park right away. And yes it only takes a second to die. Most of the time when I put it in park, the RPMs dip down and come back up to about 700, but sometimes it just doesnt come back up fast enough.
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Old 03-14-2011, 08:29 AM
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Re: WJ dies when I put it in park.

It never happens when just coming to a stop at a traffic light for example, with the tranny still in D?
But i would start taking out the IAC motor and check it for cleanliness, as well the IAC air passage. The IAC stepper motor is mounted on the throttle body (rh side when looking from the front of the car), just below the TPS (throttle position sensor). Its mounted with 2 screws. If it dirty, you could clean it out with some throttle body cleaning stuff.
If the throttle body was not cleaned recently, you will probably find quite some dirt also on the throttle plate and inside the body. You could run some throttle body cleaner through it by removing the resonator box. Then you can see the throttle body.
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Old 03-14-2011, 09:10 AM
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Re: WJ dies when I put it in park.

Nope it's never happened in drive..I'll check that stuff out though. Have you guys had a good experience with using seafoam?
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Old 03-14-2011, 10:12 AM
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Re: WJ dies when I put it in park.

Unfortunately i not, because they donīt sell it overhere.
I heard before a similar problem, but in that case the engine would die after coming to a stop, without switching into park. That case seemed to be Torque converter related. The converter acts as a clutch on manual cars, and if it doesnīt release, the engine would simply stop.
Just checked on my car, but the rpm doesnīt go down at all when i switch into Park, in fact it goes up a little bit. Maybe good to check the rigging of the gear shift mechanism.

ADJUSTMENTS - GEARSHIFT CABLE
Check adjustment by starting the engine in PARK
and NEUTRAL. Adjustment is CORRECT if the
engine starts only in these positions. Adjustment is
INCORRECT if the engine starts in one but not both
positions. If the engine starts in any position other
than PARK or NEUTRAL, or if the engine will not
start at all, the park/neutral position switch or TRS
may be faulty.
(1) Shift transmission into PARK.
(2) Remove floor console as necessary for access to
the shift cable adjustment. (Refer to 23 - BODY/INTERIOR/
FLOOR CONSOLE - REMOVAL)
(3) Loosen the shift cable adjustment screw (Fig.
64).
(4) Raise vehicle.
(5) Unsnap cable eyelet from transmission shift
lever (Fig. 65).
(6) Verify transmission shift lever is in PARK
detent by moving lever fully rearward. Last rearward
detent is PARK position.
(7) Verify positive engagement of transmission
park lock by attempting to rotate propeller shaft.
Shaft will not rotate when park lock is engaged.
(8) Snap cable eyelet onto transmission shift lever.
(9) Lower vehicle
(10) Tighten the shift cable adjustment screw to 7
N·m (65 in.lbs.).
(11) Verify correct operation.
(12) Install any floor console components removed
for access. (Refer to 23 - BODY/INTERIOR/FLOOR
CONSOLE - INSTALLATION)
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Old 03-14-2011, 11:31 AM
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Re: WJ dies when I put it in park.

It's not dying like a manual car though. There's no sputter or jolting at all. The engine just slows and shuts off. Also, I think if it were the torque converter I would have this issue in drive and not in park. I'll let post again once I clean the IAC and throttle body.
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Old 03-28-2011, 06:14 PM
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Re: WJ dies when I put it in park.

Any update on your problem?
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Old 04-01-2011, 01:18 AM
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Re: WJ dies when I put it in park.

I cleaned out the IAC and it was filthy. I haven't been driving it much though because my power steering blew out and the brand new mopar pump that I got blew after only a couple days. I got it replaced free of charge, but I just got back from a week long holiday so we'll see how well it does these next few days.
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Old 04-01-2011, 05:41 PM
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Re: WJ dies when I put it in park.

Quote:
Originally Posted by MJohnson92 View Post
Nope it's never happened in drive..I'll check that stuff out though. Have you guys had a good experience with using seafoam?

Yes,It's good stuff. Wifes 99 GC had code for cylinder misfire,I seafoamed it reset computer no problems since.I poured it slowly into the brake booster hose.Let it sit for about 30 minutes and started it up smoked up the neighborhood,but it cleaned up everything,Jeep ran much better after Seafoaming.Hopes this helps.
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Old 04-04-2011, 12:10 PM
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Re: WJ dies when I put it in park.

A couple of things, yes seafoam is an excellent product for what ever the label designates on the diff types of additives. they have quite a few diff applifcations.
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Old 04-08-2011, 01:12 AM
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Re: WJ dies when I put it in park.

How much would you recommend putting in the brake booster line? Do you add it while running or engine off? I don't really want to flood it or add way too much and blow a rod or something like that.
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