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Old 09-03-2006, 08:14 PM   #1
sc4x4's Avatar
Join Date: Aug 2006
Location: South Carolina Low Country
Posts: 6
Idle problem?

I have a 1990 with a 4.2, it has an aftermarket carb. that was put on by the previous owner. The motor runs fine as long as I don't stop, as I slow down it will either float between 600 and 1000 rmp or it will drop to 0 and cut out forcing my to pop the clutch or restart the motor. (sometimes it actually works corectly) Is this a common problem? Do I need a new carb or is there a way to adjust the one I have, or do I need to find a replacement? Sorry I do not know the brand of the one on the motor. Any help or suggestions would be great.

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Old 09-03-2006, 09:25 PM   #2
coilovers are damn flexy
bluvikng's Avatar
Join Date: Mar 2006
Location: Texas
Posts: 3,260
Before you through it away, try giving it a good cleaning with Barryman's carb cleaner. If that does not help, then you might need a rebuild kit.

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Old 09-06-2006, 06:44 AM   #3
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Join Date: Aug 2005
Location: upstate ny
Posts: 119
the carbs on the 4.2 are real pains to deal with even the aftermarket versions of the carter suck i would suggest a weber or a holley / motorcraft conversion
95 yj 4.0 4 inch bds and 1.5 shackle lift 33inch swampers for summer and 32 inch mudkings for winter 8500# milemarker winch and homemade high lift / light mount on hood

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Old 09-06-2006, 06:55 PM   #4
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Join Date: Aug 2006
Location: South Carolina Low Country
Posts: 6
Thanks for the input, I went and saw a buddy of mine, after about an hour of timing adjustment, cleaning the carb and re-routing a couple of vacume lines we were able to get it to clear up.
Again thanks for the input.
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