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Old 12-17-2009, 10:17 PM   #1
carlyj's Avatar
Join Date: May 2009
Location: Las Vegas, NV
Posts: 177
Runnin' Rough

Hey All-
I recently purchased a MotorCraft 2100 rebuild this gentleman on eBay for my 89 YJ 4.2 6cyl. Good reputation 100% feedback and tons of satisfied customers on the replies. When I initially put in the carb it ran real rough. It doesn't idle well and it would shut off almost instantly after a long drive (30-40 mins). It sputters and almost dies when you give it 1/4 throttle but when you floor it runs. I followed a diagram for the vacuum install and it all seems ok.

Took it to a carb shop today to tune it and they told me the choke was bad and the brake booster was bad causing vacuum issues. They plugged up the brake vacuum port and they say it runs 100% better. I'm going to pick up Jade tomorrow.

Any suggestions as what to do to get my YJ running right?

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Old 12-17-2009, 11:08 PM   #2
whiteyj's Avatar
Join Date: Jul 2005
Location: Pleasanton CA
Posts: 4,857
Contact the guy on ebay. It just might be a bad one slipped through and if he's a stand-up guy he'll replace it. Bought a few bad bebuilts when I was running vehicles with carbs.

Fallen Angel...Former MOD
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Old 12-17-2009, 11:31 PM   #3
after birthday glow
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Join Date: Jul 2009
Location: wisconsin
Posts: 1,963
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yeah get a hold of him hes supposed to be a good guy about helping u fix the prob and or replacing the carb
some say why i say
its a jeep thing u wouldn't understand
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