Wj stops surging when AC is on, possible causes? - JeepForum.com

 
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post #1 of 7 Old 05-05-2012, 03:02 PM Thread Starter
Brian321
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Wj stops surging when AC is on, possible causes?

So my 99 wj has always had a slight surging issue at idle, I have never really thought to much about it, but I recently noticed that the surging goes away with the AC on. It idles perfectly at about 700 rpms. It surges between 700-900 rpms with the AC off. Any idea what this might be?

It's a 99 4.7, with a new upstream 02 sensor, new TPS, and IAC.


1999 Grand Cherokee
4.7L
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post #2 of 7 Old 05-05-2012, 03:59 PM
narnwv
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TPS.

IS yours a Mopar TPS. If not, it's the wrong one.
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post #3 of 7 Old 05-05-2012, 04:11 PM
04Overland47
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^x2

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post #4 of 7 Old 05-05-2012, 11:33 PM Thread Starter
Brian321
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It's a mopar TPS and IAC. And the 02 is from rockauto.

1999 Grand Cherokee
4.7L
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post #5 of 7 Old 05-06-2012, 09:00 AM
04Overland47
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Try cleaning the throttle body with a good cleaner

2004 WJ Overland 4.7HO Graphite 127k miles / Powerstick Muffler / Superchips / Bilstein HD's / Addco Rear Bar / SOLD!
1998 ZJ Limited 5.9 SOLD!
2010 WK Laredo 5.7
1999 WJ Limited 4.0

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post #6 of 7 Old 05-06-2012, 01:05 PM Thread Starter
Brian321
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Quote:
Originally Posted by 04Overland47 View Post
Try cleaning the throttle body with a good cleaner
I have done this twice along with replacing the TB gasket.

1999 Grand Cherokee
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post #7 of 7 Old 05-06-2012, 03:01 PM
04Overland47
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Quote:
Originally Posted by Brian321

I have done this twice along with replacing the TB gasket.
Hmm not sure, maybe someone else can chime in..

2004 WJ Overland 4.7HO Graphite 127k miles / Powerstick Muffler / Superchips / Bilstein HD's / Addco Rear Bar / SOLD!
1998 ZJ Limited 5.9 SOLD!
2010 WK Laredo 5.7
1999 WJ Limited 4.0

Youtube Channel
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