WJ might be possessed - Page 2 - JeepForum.com

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post #16 of 21 Old 09-18-2013, 04:13 PM
the88thpianoman
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2003 WJ 
 
Join Date: Apr 2008
Location: Tampa
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Quote:
Originally Posted by 2004DUB View Post
Make sure you used a Mopar TPS, I tried multiple after market ones and they all failed within a week of install.
Quote:
Originally Posted by beretta5spd View Post
whoops. went with whatever NAPA sells. If it goes bad we will go from there
Mopar sensors are statistically more likely to not fail and operate properly. That said, I've had a BWD TPS for 3-4 years now and it's still working flawlessly, so there's still plenty of luck to be had with aftermarket as well.


2003 WJ in Jeep Green Metallic, 4.0/242/4.10's. 4" Teraflex springs w/ RE monotube shocks and IRO short arms, cheap intake w/ amsoil filter, 2.5" hi flow cat and back exhaust, lots of lights and other misc crap.

Check out my build thread here: Life lessons and budget build
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post #17 of 21 Old 09-18-2013, 04:54 PM
JoeFaz
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KL Cherokee 
 
Join Date: Sep 2012
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Originally Posted by beretta5spd View Post
Hello all... here's the vehicle in question:

It idles in neutral real good. A nice solid 700 rpm like it should be. A month ago it was idling all over the place but then it settled down and went back to normal. (700-1500 rpm)
So what did you think it was making the eratic idle? Mine is all over the place between 200-2000 rpms at any given time. I have had the TPS and several other sensors changed (professionally) and it will be ok for a day or so, then BAM, right back to the very frustrating idle issue. Now, it has actually begun to occasionally idle so low it will kill at a stop if I'm not careful. When it's high, I have to keep serious pressure on the brakes or put it in N just to keep it from lurching forward. I'm at my wits end!
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post #18 of 21 Old 09-18-2013, 05:52 PM Thread Starter
beretta5spd
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Join Date: Apr 2012
Location: Nipawin
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absolutely thanks to everyone! Jeep is no longer possessed and the cruise control works perfect. It took a couple days of real hard troubleshooting and washing the engine bay didn't help.

Here's what needed to be fixed!

1. TPS (it may have happened because of pressure washing the motor but I don't think so. i checked that connection and it was dry)
2. Vacuum hose that hooks up to reservoir behind front bumper cover came off (I don't think this happened because of pressure washing the engine bay either. That thing is REALLY hidden)

It was a crazy day having both of those happen at once.

Thanks Jeepforum for giving me pointers and confidence to tackle this one
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post #19 of 21 Old 09-18-2013, 06:04 PM Thread Starter
beretta5spd
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Location: Nipawin
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Quote:
Originally Posted by JoeFaz View Post
So what did you think it was making the eratic idle? Mine is all over the place between 200-2000 rpms at any given time. I have had the TPS and several other sensors changed (professionally) and it will be ok for a day or so, then BAM, right back to the very frustrating idle issue. Now, it has actually begun to occasionally idle so low it will kill at a stop if I'm not careful. When it's high, I have to keep serious pressure on the brakes or put it in N just to keep it from lurching forward. I'm at my wits end!
that's a real good question. i wish i could be more help. I've cleaned the throttle body, changed the TPS, and repaired the vacuum lines

If I were you I would put a high end scanner on the jeep that gives a live readout of the sensors outputs. That way you could see in real time which input is causing the fluctuation.
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post #20 of 21 Old 09-18-2013, 10:46 PM
JoeFaz
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Quote:
Originally Posted by beretta5spd View Post
that's a real good question. i wish i could be more help. I've cleaned the throttle body, changed the TPS, and repaired the vacuum lines

If I were you I would put a high end scanner on the jeep that gives a live readout of the sensors outputs. That way you could see in real time which input is causing the fluctuation.
Thanks. Is a "high end scanner" something a shop would have on hand? I'm guessing this is something more intricate than just reading codes.
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post #21 of 21 Old 09-18-2013, 10:51 PM Thread Starter
beretta5spd
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Quote:
Originally Posted by JoeFaz View Post
Thanks. Is a "high end scanner" something a shop would have on hand? I'm guessing this is something more intricate than just reading codes.
A good shop should have one. I remember my high school had a snap on scanner 10 years ago that would monitor all the sensor data in real time. And you are exactly right. The size is pretty similar to a code reader... But the data available is substantially more detailed. There's even products and apps out there that will allow you to do it on your smart phone.
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