Last problem to fix---- The Idle - JeepForum.com

 
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post #1 of 12 Old 11-01-2013, 06:16 AM Thread Starter
cmberges
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Last problem to fix---- The Idle

The old post was getting long so I'll start a new one about the new problem.

For a quick refresher, I have changed almost every sensor and new PCM and now have a idle issue. (Link to org. post--http://www.jeepforum.com/forum/f310/...-dies-1570379/)

Installed a new TPS (only part I didn't change)(mopar) and still idling high. In the morning it starts and idles fine. Drive down the street and hit the stop sign, idles at about 1k. Go to park at work and you can hear the tranny clunking because its reving high. Any other options?????

PCM need reprogrammed again? No check engine light either. I aslo had it running and unplugged the IAC and that did nothing (I would think it would make it run worse doing that but nothing happened).

If the damn thing would just idle right it would be the perfect vehicle...... But all the parts are under warranty so suggestions on what to try next?

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post #2 of 12 Old 11-01-2013, 02:59 PM Thread Starter
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So a code final came up P1294. Remember everything is new so is it possibly a bad IAr (IAC, whatever)?
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post #3 of 12 Old 11-02-2013, 09:35 AM Thread Starter
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So unplugged the map sensor and it idled up then back down after it was plugged back in. I'm runnin out of ideas.
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post #4 of 12 Old 11-02-2013, 01:10 PM
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Start simple, make sure the computer has the correct parameters learned. Disconnect the battery to reset the computer, then when you go to start the Jeep, turn the key to on (not start) for three seconds to prime fuel pressure, then turn it over to start. If you have erratic idle after that, there's a malfunctioning sensor or you may have a vacuum leak somewhere. If possible, get a scanner on it with live engine data to look for abnormal fluctuations in sensors. Throttle position sensor should read about 15-17% at closed throttle; if it fluctuates even slightly when you're not moving the gas pedal, it's a bad TPS. Same goes if there are any dead/irregular spots when slowly moving the pedal from closed to WOT.

This is usually caused by a bad TPS or IAC, but a junkyard/reman PCM could easily be the culprit.

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.

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post #5 of 12 Old 11-02-2013, 09:19 PM Thread Starter
cmberges
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Did all that stuff a few times and no luck. Checked for leaks today and found 0. Also the TPS is brnad new and mopar so all I can think is the IAC or PCM.

I might just get another new IAC tomorrow just to check.
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post #6 of 12 Old 11-03-2013, 12:06 AM
drmadcat
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How bad is the idle mine jumps around a bit.
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post #7 of 12 Old 11-03-2013, 09:16 AM Thread Starter
cmberges
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About 1g in gear and then clunks out of gear to park then it's at 15-1700. It starts out fine in the morning then get bad after a mile or 2. What gets me is now there is no more code and it started idling fine yesterday afternoon. Then this am is was crappy again. I'm freakin lost.
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post #8 of 12 Old 11-03-2013, 11:55 AM
new2site
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Maybe you have a faulty/sporadic temperature sending unit... found this info:

The idle control is activated by the temperature sender unit. It sounds as though yours is giving a cold signal to the computer and it pushes up the idle speed to compensate as if it has just started.
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post #9 of 12 Old 11-04-2013, 12:56 PM Thread Starter
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Just put a new iac in and so far so good. I update 1 final time if that does the trick............God I hope so.............
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post #10 of 12 Old 11-04-2013, 04:33 PM Thread Starter
cmberges
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Well that lasted about an hour. Back to being jacked up again. How can it run so normal and then restart it later and back to running like crap.
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post #11 of 12 Old 11-04-2013, 07:51 PM
the88thpianoman
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Quote:
Originally Posted by cmberges View Post
Well that lasted about an hour. Back to being jacked up again. How can it run so normal and then restart it later and back to running like crap.
I'm not sure what the spec is, but you likely need to check the resistance between the PCM and the TPS/IAC. Someone with the FSM can post up the pinouts and resistance specs. You may have a poor/intermittent connection to one of those sensors.

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:
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post #12 of 12 Old 11-05-2013, 06:11 AM Thread Starter
cmberges
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I hope some does have that info. And how to check it would be sweet. Thanks guys.
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