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  #121  
Old 01-08-2015, 07:38 PM
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Re: jeep surge idle

There is indeed a throttle position sensor in there. Look at this page from Hella: Throttle Position (TPS) | HELLA

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  #122  
Old 01-08-2015, 07:43 PM
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Re: jeep surge idle

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Originally Posted by Frango100 View Post
There is indeed a throttle position sensor in there. Look at this page from Hella: Throttle Position (TPS) | HELLA
Wow that's awesome. Learn something new everyday lol. Well bad news, let it sit for a few hours and went back for a drive and its dropping down to 550rpm again like it did with the old one geez Idk what else to do now...
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  #123  
Old 01-08-2015, 07:53 PM
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Originally Posted by Jeff1119 View Post

Wow that's awesome. Learn something new everyday lol. Well bad news, let it sit for a few hours and went back for a drive and its dropping down to 550rpm again like it did with the old one geez Idk what else to do now...
The normal rpm at idle should be at 550. At least according to every bit of tech info ive read and my own personal experience with it.
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  #124  
Old 01-08-2015, 07:57 PM
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Let me add on to that tho. I have mine bumped up to 750 for various reasons mainly my mods but also the sound is pretty awesome
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  #125  
Old 01-08-2015, 08:01 PM
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Re: jeep surge idle

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Originally Posted by Strongjeff View Post
The normal rpm at idle should be at 550. At least according to every bit of tech info ive read and my own personal experience with it.
Really? Never really could find anything. I mean it's not like a shake anymore or anything like I got with the old one. You just see it drop a little after a complete stop. Here's a pic of where it's at.
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  #126  
Old 01-08-2015, 08:17 PM
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Originally Posted by Jeff1119 View Post

Really? Never really could find anything. I mean it's not like a shake anymore or anything like I got with the old one. You just see it drop a little after a complete stop. Here's a pic of where it's at.
Normal bro. I had a surging issue from a slightly diffrernt reason. I got moisture in the tb from when i cleaned it out from overporting it. I didnt take into account how sensitive the electronics inside really were. So mine from that idled over 1300 and would at time act up with severe shuddering and little electronic throttle control. I had to pull over and shut her down to get it to temporarily reset itself.

But since then i replaced the tb and all is fine. She idles where i have it set. 750. I have a haynes repair manual. It states that 525 to 600 is normal, tho mine always sat at 550 and would occasionally dip to 525 when coming to a stop.
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  #127  
Old 01-08-2015, 09:17 PM
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Re: jeep surge idle

Quote:
Originally Posted by Strongjeff View Post
Normal bro. I had a surging issue from a slightly diffrernt reason. I got moisture in the tb from when i cleaned it out from overporting it. I didnt take into account how sensitive the electronics inside really were. So mine from that idled over 1300 and would at time act up with severe shuddering and little electronic throttle control. I had to pull over and shut her down to get it to temporarily reset itself.

But since then i replaced the tb and all is fine. She idles where i have it set. 750. I have a haynes repair manual. It states that 525 to 600 is normal, tho mine always sat at 550 and would occasionally dip to 525 when coming to a stop.
thats good to know, thanks for the info man. Guess ever since this started three months ago, I've paid too much attention to it and its been driving me crazy. When i got the jeep a year ago, i never paid this much attention to the idle so maybe it always did this and i just never really thought about it until now. But i believe you, thanks for the info, guess all is normal.

Now the surging in the rain is definitely not normal. Its something I'm gonna have to bring back to my mechanic. He said when it rains and starts doing it, bring it to him and hell have another look at it because today he could not re create the problem by just spraying the coils down which i believe isn't the issue. Gonna have to wait till it rains again
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  #128  
Old 01-12-2015, 04:13 PM
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Re: jeep surge idle

Update: well of course it rained today and it's surging again so new throttle body and spark plug wires weren't it either. Mechanic said he'll reflash the ecu for free which I found as a nice offer. He said he'll do it Thursday. Of course I know this won't fix the problem but it's a nice gesture.
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  #129  
Old 02-09-2015, 04:14 PM
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Re: jeep surge idle

MAJOR UPDATE!!!: Hey guys, not sure if anyone still reads this thread or is the first time seeing this thread. If its your first, go back to the first page and read my original post to know of my problem. Anyways if you have been following this thread for a while, you would know that i have been having an idle surge issue when the roads are wet or after it has rained. I HAVE FINALLY FOUND WHAT WAS GETTING WET AND CAUSING MY IDLE SURGE ISSUE! The first picture is the pcm wires. When I looked at them the first time, i could see that there is an opening, where you can see the duct tape, that is near the the passenger front wheel on the left side. Well from what I can see, if the tire is moving on a wet road, the water is flying through that gap in the wheel well and flying onto the pcm wires. Now it looks like those wires are covered good but i took a guess and wrapped up some electrical tape on it and put some duct tape in that gap to stop water from flying threw. I also put some electrical tape on another set of wires near the air box. After doing this about a month ago, i have had numerous times of wet roads with the snow and some rain. Drove for long periods of time including today worth 3 hours on a wet road and i can for sure say my problem has finally been solved after 5 long months.:2thumbsup: I'm not sure if i have a short in that pcm wire somewhere and water was traveling through it to another destination causing the surge, but wrapping it with electrical tape solved the issue. It seems like a bad design to put the wire near a wheel well where it can potentially get wet, but whatever, I'm just glad i finally caught the problem!
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  #130  
Old 02-10-2015, 04:08 AM
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Re: jeep surge idle

A small crack in the wire isolation can give problems when moisture enters and creates a path for some of the voltage signal to leak away. Nice find and now happy jeeping.
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  #131  
Old 02-10-2015, 04:52 AM
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Re: jeep surge idle

That is great that you found it.
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  #132  
Old 02-10-2015, 08:18 PM
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Re: jeep surge idle

Quote:
Originally Posted by Frango100 View Post
A small crack in the wire isolation can give problems when moisture enters and creates a path for some of the voltage signal to leak away. Nice find and now happy jeeping.
True. I must have some type of crack in one of the wires but to take it all apart to find that one wire is too much of a hassle when simple electric tape works just fine lol. Anyways, thanks for the help you provided throughout this thread.

Thanks everybody else as well!
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