TPS confusion - JeepForum.com

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post #1 of 21 Old 08-24-2013, 03:57 PM Thread Starter
DTR
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TPS confusion

Hi,

I am getting a high idle (2k) after I cleaned TB today. I removed the IAC and TPS when I cleaned the TB...put it all back together but its running fast and smells a little rich.

Any advice out there?

1993 2.5l manual



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post #2 of 21 Old 08-24-2013, 05:18 PM
Que89YJ
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Check to see if you have fault codes. Running high idle is a vacuum leak. Spray around with brake/carb cleaner A's listen for an idle change. Do a battery disconnect for a 10 count to reset calibration.
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post #3 of 21 Old 08-24-2013, 06:04 PM Thread Starter
DTR
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I dont see any air leaks and have completed the battery restart. After driving around the idle settles in at 1500.

Would the IAC or TPS cause a high idle?...seems to be running just fine otherwise.


...and no engine codes today


thanks for the help
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post #4 of 21 Old 08-24-2013, 06:44 PM
Que89YJ
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Yes. The Iac sets idle. The tps is an input to the ECU for throttle position for setting advance. It sounds like the iac is messing up. I would still spray around and see if you hear any idle change A's check the vacuum lines. Maybe the pcv on the top of the valve cover.
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post #5 of 21 Old 08-24-2013, 06:45 PM Thread Starter
DTR
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What about the small screw under the throttle cable...can this be adjusted. Mine shows a little bit of some factory paint on the threads, I wonder if this was adjusted by the PO.
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post #6 of 21 Old 08-24-2013, 06:52 PM
Que89YJ
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That is locktite and the throttle is controlled by the ECU. Did you have a high idle before you cleaned the throttle body and iac?
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post #7 of 21 Old 08-24-2013, 07:01 PM Thread Starter
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my idle speed was always low and seemed to miss sometimes...around 450 rpms
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post #8 of 21 Old 08-24-2013, 08:11 PM
Que89YJ
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And now it's high. If you played with the iac and it is staying high then your iac is probably shot.
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post #9 of 21 Old 08-28-2013, 08:57 AM
Firefyter-Emt
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Disconnect the ground cable and touch it to the positive cable. That will reset the CPU. If you still have a high idle, BUT the idle drops, just not low enough.... Try replacing the coolant temp sensor at the water neck (apx $20.00).

I fought this for a while swapping around TB's and IAC's before I replaced that sensor. My temp gauge worked so good that I was even able to see a ten degree decrease when I overhauled the cooling system, and it remains unchanged, but it fixed my high idle issue.

Mine would run at 1600 and drop to 1200. A CPU reset would fix it for a week, then a few days, then one drive cycle. When reset, it would be at 1100 and drop to about 600. Drive me nuts, but the coolant temp sensor did the trick for me!
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post #10 of 21 Old 08-28-2013, 04:38 PM
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What is the proper idle RPM? I believe my 2.5l idles around 700-800 rpm. I'm nearly 100% positive that 1000 rpm is high. Que?

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post #11 of 21 Old 08-28-2013, 06:59 PM
Que89YJ
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It is a little high. 700/800 it's normal but 1000 isn't terrible.
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post #12 of 21 Old 08-28-2013, 07:17 PM Thread Starter
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Well i put in a new iac sensor and reset the computer but still getting a high idle (2k)...drove it around to see if it would reset the idle...nothing changed.

Runs great just idling really high...any ideas? what else can i test?

thanks for the advice!
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post #13 of 21 Old 08-28-2013, 07:31 PM
Que89YJ
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Which sensor? If it was running low before you messed with the throttle body A's now it's high you problem is in the throttle body I still think you have a vacuum leak
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post #14 of 21 Old 08-28-2013, 07:32 PM Thread Starter
DTR
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Quote:
Originally Posted by Firefyter-Emt
Disconnect the ground cable and touch it to the positive cable. That will reset the CPU. If you still have a high idle, BUT the idle drops, just not low enough.... Try replacing the coolant temp sensor at the water neck (apx $20.00).

I fought this for a while swapping around TB's and IAC's before I replaced that sensor. My temp gauge worked so good that I was even able to see a ten degree decrease when I overhauled the cooling system, and it remains unchanged, but it fixed my high idle issue.

Mine would run at 1600 and drop to 1200. A CPU reset would fix it for a week, then a few days, then one drive cycle. When reset, it would be at 1100 and drop to about 600. Drive me nuts, but the coolant temp sensor did the trick for me!


Was your coolant sensor working before u replaced it...your gauge showed ok?
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post #15 of 21 Old 08-28-2013, 07:39 PM Thread Starter
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Quote:
Originally Posted by Que89YJ
Which sensor? If it was running low before you messed with the throttle body A's now it's high you problem is in the throttle body I still think you have a vacuum leak
I can't find a leak...been spaying carb cleaner but not noticing any change in the engine. I did not change the tb gasket the original is like a sticker and looks good.
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