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Old 08-19-2012, 07:13 PM
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Where to start????

I just purchased a 89 YJ 4.2L that still has the OEM carburetor. The PO is a local surf instructor here in Oceanside, CA and needless to say his maintenance was less than stellar. It is hard to start in the morning or if it has not been run for a long time. I suspect the carb but I haven't had the pleasure of rebuilding one yet. When it does fire up i have to keep it at about 1200 RPM for 5 minutes so it wont stall. This afternoon I wanted to replace the fluid in the diff but didn't have a impact wrench to knock the bolts loose. I pulled the plug to see what it looked like and out came a liquid that resembled a melted frosty from Wendy's. I just don't know where to start with the carb. Should I replace it with an aftermarket or try for a rebuild? I have read that a lot of jeepers like the motorcraft carb. I humbly present my case to the experts.

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1989 Wrangler YJ... 4.2L, 4" Rough Country lift on 33X12.5 BF Goodrich KM2. MC2150 Swap. Nutted. Team Rush ignition upgrade. LOTS of things to do....
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Old 08-19-2012, 07:48 PM   #2
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I say if you have the know how on how to rebuild then rebuild. If not or your looking to start upgrading might as well start with the heart and soul of your rig (the motor). As I've learned over the past couple years playing with mine, you can have all the billy bad ass parts like big tires winch high suspension however if your motor won't pull it then there really is no point.

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Old 08-19-2012, 08:22 PM   #3
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89 Wrangler

Aloha. I've got the same exact year. Mine is a Sahara. I live in Hawaii, so I don't have to worry about any of the CA emission BS. However, i must inform you that you will get up close and personal in ownership of this fun, but pain in the ass vehicle. Ours is a love/hate relationship.
As for the issue; well, start with changing fluids if they need it, then check timing, idle speed, make sure the choke is working properly on that Carter carb. Vaccum leaks are normal on old model like ours, expecially if there was lack of maintenance.
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Old 08-19-2012, 08:40 PM   #4
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Buy an MC2150 off the seller from ebay.
Do the nutter bypass.
Drive around happily.

Seriously my stock carb was garbage when I picked up my Jeep. It stuttered and pop, didn't want to start, etc. New carb and it's like a new Jeep.
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Old 08-19-2012, 10:54 PM   #5
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Welcome to the madness! With CA emissions I think you are limited as to what you can actually do. If you change your carb you will have to make it look stock and the Motorcraft carb and your air cleaner will not match. There is a fellow on Ebay that sells these carbs and will help you make it look stock. Do a search for Motorcraft 2150 carbs here and ebay to find him. Once you put an aftermarket carb on 90% of the vacuum lines are no longer needed but you have to leave them or put them back on for your smog visual.
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Old 08-20-2012, 12:05 AM   #6
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I agree with the nutter and diffant carb, but check your choke frist, that may help alot.
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Old 08-20-2012, 12:17 AM
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I figured that I would eventually go with the motorcraft carb but was worried about CA emissions. I have noticed that a lot of people in the forum have gone that route and seem to like it. Since I can register my vehicle in KS I will just do that to "bypass" the CA smog test. Unfortunately to get it registered on base I have to get a smog test though. Thanks for all the help guys.

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1989 Wrangler YJ... 4.2L, 4" Rough Country lift on 33X12.5 BF Goodrich KM2. MC2150 Swap. Nutted. Team Rush ignition upgrade. LOTS of things to do....
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