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Old 10-25-2014, 05:43 AM
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01 jgc v8

I took the battery out to fix some broken vacuum lines and the line that goes under and in the front left side bumper into that box I have no idea what it is maybe like a moisture purge unit or something anyway I put the battery back in and it wouldn't start so I jumped it drove it home tl let it sit for a day on wendsday then drove to the store and it was dead so I jumped and it started got home and after I shut it off it was completely dead and wouldn't start I put a jumper pack on it ,it started up and would t idle after I took my foot off the gas it would drop ideal and die I got a new battery today how do u do an idle relearn and should I clean iacv and tps? How should I go about his?


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Old 10-25-2014, 11:17 AM
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Re: 01 jgc v8

Welcome to the garage.
The large box where the vacuum line goes to is the vacuum reservoir. It keeps a constant vacuum for the cruise control to work well.
Strange that the battery started to give problems after you removed it. Was all ok before the battery removal?
Did you check if the new battery is charging normally? Engine off and battery fully charged should give about 12.8V. Engine running should give 13.5-14.5V.
If the PCM looses the IAC settings, then it should relearn them by itself. If you had broken vacuum lines for some time, then the PCM probably closed the IAC completely, to try to control the idle speed. Now that the vacuum leak is solved, it has to reposition the IAC to control the idle speed. You probably have to keep your foot on the accelerator for a longer time, for the PCM to be able to relearn.
Cleaning the IAC is not a bad idea if it was not done for a long time.
TPS is a sealed unit and can not be cleaned. If it gets faulty, you will need to replace it. You could check the TPS by using a scanner with live data. Idle TPS % is around the 12%, but at least should be a steady indication. If its jumping a bit, then the TPS is at the end of its usefull live.
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Old 10-25-2014, 11:51 AM
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Re: 01 jgc v8

Thanks man I haven't checked it yet I will today I had to go and get battery cleaner for the wiring


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