RPM surge at idle - JeepForum.com

 
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post #1 of 3 Old 06-12-2013, 08:34 PM Thread Starter
Cashcrazy
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1983 CJ7 
 
Join Date: May 2013
Location: Tyler
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RPM surge at idle

1989 4.2, all stock. I have recently started to get a light RPM surge after the engine is warm at an idle. I am thinking this might be a vacuum line issue with the Carter. Does anyone know if there is a known area that will cause this? It will give me a starting place at least.

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post #2 of 3 Old 06-13-2013, 02:45 PM
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian
Posts: 2,563
Quote:
Originally Posted by Cashcrazy View Post
1989 4.2, all stock. I have recently started to get a light RPM surge after the engine is warm at an idle. I am thinking this might be a vacuum line issue with the Carter. Does anyone know if there is a known area that will cause this? It will give me a starting place at least.
Well, I am a MPFI guy, but seeing how none of the carbed owners have chimed in, (Shame on you all!)then perhaps this will help you....
http://www.jeepforum.com/forum/f19/i...stops-1253726/
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post #3 of 3 Old 06-13-2013, 03:21 PM
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
first before you touch anything, check for vacuum leaks. Not only the vac lines, but intake to carb mounting, intake to head mounting and EGR area. The long intake manifold can and will warp and the bolts work loose. The carb tends to loosten itself up every 18 months as does the EGR.

If you have NO vacuum leaks and your manifold vacuum is reading above 20",then look at the carb.

Go here and see if this is your problem:

http://www.jeeptech.com/engine/carter.html

418 miles on 19 gallons of gas. Can't beat the BBD !
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