[NHWK05]

So i"ve asked this question on may other forums and no one seems to have a solution for it and apparently Chrysler denies its a real.

The jeep under no common circumstances will stall out or bog down when stopping. BTW 4.7 V8.
It will happen when the engine is cold, or hot, it will happen after alot of skinny pedal driving or under normal human grandma driving. It will happen in stop and go traffic or in normal traffic.

Basically normally when i come to a stop the rpms drop like the should and stay there. Some times it will drop well below the 500 rpm mark and then bounce back up. Occasionally it will just stall out completely and die.

I talked to a very well seasoned master jeep tech at the dealership. He said that first thing they do is a reflash of the computer. (did that and it did not fix it)

Next he said it could be the torque converter is not working properly and that adding about 1/2 a qt of tranny fluid may fix the issue. ( i will try this next)

Has anyone else sxperienced this and successfully fixed it?

Please help, its really annoying and embarassing.

 

[dreamer1213]

Hmm....my 4.7 H.O in my WJ drops to super low idle mode when coming to a stop sometimes....it drops and idles at 400 rpm's...but has never stalled...

I cleaned out the IAC chamber and motor, and still nothing..same thing...I dunno if its a glitch somewhere in the computer system, or if its the IAC motor thats actually bad...

 

[NHWK05]

I was wondering about the IAC myself but everyone i have talked with the issue said they changed it and it did not fix it. Thats why i have not wasted my money on a new IAC yet.

 

[dreamer1213]

Yeah...I dunno...I was thinking perhaps when I do the superchips flash that it might perk up/smooth out the idle..

 

[NHWK05]

Thats the other thing that bugs me. To me even when its not acting up, the idle never feels very smooth, it feels like it has a bad idle or bad spark plugs or sumtin, almost a very little shaky, but not in the sound, or seat or anything but i only notice it when i lean my knee on the door while idling.

 

[Dylans3960ccs]

it is probably the mass air-flow sensor for your case ,Hannes your on your own?.?.

 

[baronvonhavok]

i seem to have the exact opposite problem. when in park or neutral, my car idle's at 1500 RPMs. i also have the 4.7, but its non-HO in a 04 WJ. the only mod i have is the K&N intake. i can't really remember when this started happening.

any ideas guys?

 

[dreamer1213]

1500 rpm idle....something is wayyyyyyyyy wrong!! I'd say the throttle position sensor perhaps your case Paul. That sensor isn't sending the computer the right info...that would be my first guess..

 

[NHWK05]

it is probably the mass air-flow sensor for your case ,Hannes your on your own?.?.

There is not mass air flow sensor on jeeps.

 

[Scottina06]

oh my god....Dylan tries to post somewhere beside off topic.....and has no idea!!!!LOL

 

[baronvonhavok]

the other thing i realized it might be on the way to work today. i have a automatic starter installed. i don't know if this has anything to do with what might be wrong, but it might help you guys think of stuff.

i want to call the stealership, but im afraid they'll give me a lot of shit for the intake and the autostart.

any opinions on my options? haha

 

[mjl2610]

Possible vacuum hose issue?? I recall on my friends Jeep his high idle was due to a vacuum hose that was broken.

 

[NHWK05]

I dont know, i think all the vac lines look ok to me. I have heard of so many other people with this issue on Jeepforum (barf) and Jeeps Unlimited that i dont think its my random issue. Apparently there is a TSB on it but it is just a reflash of the computer and that did not fix it.

 

[Scottina06]

I never had this problem...so its hard to know what problem your having. But....did you check all the hoses routed to the throttle body? Pull your IAT sensor and check it...make sure you replace it so air flows directly over it. How many miles? Maybe new plugs? I doubt you will have this problem with the superchips and the afe

 

[NHWK05]

I have 65k miles on it. I checked IAT and it looked fine but i dont really know what i am looking for. I have not done plugs yet so maybe its time for that. is it hard to do plugs on the 4.7?

I dont have a superchips, YET, just the afe. I cant afford the chip right now.

 

[Scottina06]

yeah....replace the plugs every 30K miles with stock plugs...they are only like $2 each...maybe less. Anyone can do it.....I will see if i can find it in the service manual. But on the 4.7....there are no plug wires...just ignition coil towers. Unbolt those and pull straight up to access the plugs. The back ones are kinda tight and you have to remove the intake muffler(box on top of the engine that says 4.7) But its pretty easy.

 

[NHWK05]

Cool, I think i will do that. My friend works at the dealership so he can get me mopar plugs.

What is the purpose of that air intake box thingy? is it removable if i extend the air intake tube? Will it make a difference?

 

[Scottina06]

Cool, I think i will do that. My friend works at the dealership so he can get me mopar plugs.

What is the purpose of that air intake box thingy? is it removable if i extend the air intake tube? Will it make a difference?

its pretty much a intake noise muffler...and yes you can rremove it...i dont have one on my 4.7. but I have a different intake than you.

 

[NHWK05]

its pretty much a intake noise muffler...and yes you can rremove it...i dont have one on my 4.7. but I have a different intake than you.

Hmmm, i will look in to this.

BTW, (off topic) I just noticed your the one that responded to the E brake handle on justforjeeps.com. I wanna do that to mine but i dont think the colors will look good with a khaki interior, I want to do the center console cover as well. maybe dark slate gray?

 

[Scottina06]

they make the 08 handle in khaki