Jeep Idles high in gear,even higher in N
Finally got to drive my new (old) jeep (98) Cherokee 4.0.. When in gear the RPM stays at 1,200 RPM'S and when switched to N it hangs at 2k. I know I need to try to clean the IAC?? Do you just remove it and spray some gum cutter in it ?? my check engine light is on so im gonna have autozone pull the codes. Is there a write up for cleaning it? Any help/suggestions would be helpful.
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A thorough cleaning with carb and choke cleaner is easy to do. Pull the IAC (2 torx heads) and use a little scotchbrite on the pintle.
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I would suggest adjusting the TPS also seems like it may be out of whack also.
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here's how you adjust the tps...looks like a real pain...
http://www.autozone.com/az/cds/en_us...rInfoPages.htm |
Originally Posted by XJ Stryker
(Post 68350)
I would suggest adjusting the TPS also seems like it may be out of whack also.
Originally Posted by okcjeeper
(Post 68351)
here's how you adjust the tps...looks like a real pain...
http://www.autozone.com/az/cds/en_us...rInfoPages.htm |
Originally Posted by BlueXJ
(Post 68352)
Gentlemen the '98 does not have an adjustable TPS only Renix era Jeeps. I think that the TPS can be checked and replaced if found to be defective.
OOPs overlooked the year again I am so used to Renix. So does this mean that if the HO TPS goes out you have to replace it you can't just adjust it. That sucks. hmmmmm Go to JY and pick up one and install it see if it fixes it. That would be a Cheap swap since JY onlly charge a few bucks for sensors rather than the 50+ auto parts stores charge for them. :thumbsup: |
I will have autozone pull the codes..I know on my 88 mustang GT the TPS is NOT adjustabe and if the voltage reading with the key on engine off is out or range the TPS must be replaced. So is the link that okcjeep sent correct on the voltage reading and what wires to hook into to get the reading?? I dont understand why i would have to jump all 3 wires together to get a reading??? Now if i remove the IAC is there any gaskets that have to be replace?? or is it a straight forward removal.?
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Forget about the TPS untill you've cleaned the TB.
There is no way to adjust a TPS on an ODBII motor. |
Originally Posted by FrankZ
(Post 68357)
Forget about the TPS untill you've cleaned the TB.
There is no way to adjust a TPS on an ODBII motor. |
Have you tried pulling the codes using the key trick. ON-OFF 5 times, stopping on the 5th ON, and then watch the CEL and odometer.
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Hmm I didn't know you couldn't adjust the tps doh..I read that article at autozone's site and thought it was a bit odd you had to drill out the hole where the adjusting screw was...thanks for the correction...always good to learn new things..:)
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Originally Posted by XJ Stryker
(Post 68350)
I would suggest adjusting the TPS also seems like it may be out of whack also.
Originally Posted by okcjeeper
(Post 68351)
here's how you adjust the tps...looks like a real pain...
http://www.autozone.com/az/cds/en_us...rInfoPages.htm |
Advance auto let me use there scan tool and this is what i found
P0123 Tps/ pedal position sensor a Circuit high input P0122 Tps/Pedal position A Circuit Low input. P0700 Trans Control SYS Malfunction. Now im going to replace my TPS with one in the JY and pull the battery cable and see if the CEL comes back. The TPS is the Sensor right across from the Firewall on the TB?? what years will fit my 98? What does the P0700 code mean? |
All 3 are related to the TPS so if you correct the first 2 the third will also go away.
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awesome!! i will try my best to get the correct TPS from the JY tommorow and hope that it to isnt FUBAR.
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