2001 grand Cherokee Stalling.

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bigal389
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Vehicle Year: 2004
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Vehicle Model: Wrangler X

2001 grand Cherokee Stalling.

Post by bigal389 »

Ok here's the situation: a friend that I work with has a Grand Cherokee 4.0 he tried to Change the timing chain and gears himself and could not get it to run after the install. I told him I would try to help him with it. After a an hour of trying I had no luck so I tore it back down to see if he had it timed correctly and it was. Keep in mind it ran and good before and someone suggested he put a timing set on due to the mileage (150k). I put timing cover and balancer back on but the balancer was about 60* off tdc so I took the balancer bolt out just to see where the keyway was and it was still straight up, the balancer had spun. I installed a spare balancer that I had tdc marks lined up, good to go right, nope, he had pulled the cam sensor and it was off as well. I pulled the sensor and re installed it fired right up. Now this is where it gets weird, it runs great until you try to come to a stop then it acts like its running out of gas and dies. He say it didn't do this before. I thought maybe I had it 180 out so I rechecked and it was correct. Any ideas or thoughts on what it could be? I have checked for vacuum leaks, loose connections, grounds etc. it has no codes either.
Thanks, Al
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SilverXJ
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Stroker Displacement: 4.6L
Vehicle Year: 2000
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Vehicle Model: Cherokee
Location: Radford, Va

Re: 2001 grand Cherokee Stalling.

Post by SilverXJ »

How are you installing the cam sensor?

How did you install the timing chain, dot to dot?

How does it run aside from stalling?
bigal389
I made it to triple digits!
I made it to triple digits!
Posts: 102
Joined: February 5th, 2015, 4:55 am
Stroker Displacement: 4.6
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: Wrangler X

Re: 2001 grand Cherokee Stalling.

Post by bigal389 »

Installing the cam sensor with engine on tdc on the timing mark #1 piston on compression using the tooth pick method.
Timing chain is dot to dot.
Runs normal besides the stalling on deceleration.
I also cleaned the IAC valve and replace the tps with a known good one.
Al
bigal389
I made it to triple digits!
I made it to triple digits!
Posts: 102
Joined: February 5th, 2015, 4:55 am
Stroker Displacement: 4.6
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: Wrangler X

Re: 2001 grand Cherokee Stalling.

Post by bigal389 »

Also on a quick note when it stalls it will start right back up.
AL
bigal389
I made it to triple digits!
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Posts: 102
Joined: February 5th, 2015, 4:55 am
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Vehicle Model: Wrangler X

Re: 2001 grand Cherokee Stalling.

Post by bigal389 »

No real updates, the only thing I have been able to get any results from was place a small spacer over the idle stop. With the spacer there it doesn't cut off but the idle still drops to about 300 when stopping unless the a/c is then it only drops to 500.
Al
bigal389
I made it to triple digits!
I made it to triple digits!
Posts: 102
Joined: February 5th, 2015, 4:55 am
Stroker Displacement: 4.6
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: Wrangler X

Re: 2001 grand Cherokee Stalling.

Post by bigal389 »

Ok I know this isn't the right way to fix the idle problem he's having but the only way I got it to stay steady was to adj the idle stop on the throttle body.
Al
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SilverXJ
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Posts: 5789
Joined: February 14th, 2008, 7:14 am
Stroker Displacement: 4.6L
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Radford, Va

Re: 2001 grand Cherokee Stalling.

Post by SilverXJ »

Did you clean or replace the IAC? Maybe try resetting the PCM.. prehaps it has a bad habit left over form a stretched chain.
bigal389
I made it to triple digits!
I made it to triple digits!
Posts: 102
Joined: February 5th, 2015, 4:55 am
Stroker Displacement: 4.6
Vehicle Year: 2004
Vehicle Make: Jeep
Vehicle Model: Wrangler X

Re: 2001 grand Cherokee Stalling.

Post by bigal389 »

Yes iac was cleaned and PCM was reset each time any changes were made.
Al
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Re: 2001 grand Cherokee Stalling.

Post by Mr-TT »

Have you tried TPS.You may have a vacum leak
UberDuper
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Re: 2001 grand Cherokee Stalling.

Post by UberDuper »

Had a similar problem with a honda s2000. Ended up being the MAP sensor voltage spiking when going off throttle causing the ECU to dump a ton of fuel.
AFAIK you can do a quick test by disconnecting the MAP sensor and driving it around. ECU should fall back on its tables and run alright.
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