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Old 03-02-2014, 02:09 PM   #1
Join Date: Aug 2013
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Could this be the carburetor?

Vehicle info: 1987 YJ with 4.2l V6 Automatic transmission

I'm having two main problems with my '87 right now...The first is that after the engine runs for about 5 minutes it starts to stall if it's not getting gas. When the jeep is started cold it'll run fine for a bit, but then just keeps stalling, as soon as I start it after it stalls it will stall right out if I'm not on the gas right away.

The second problem is that my 4wd isn't currently working. I can shift it into 4H, feel it shift, hear it shift, but, with the rear tires spinning, the front tires are stationary. The light doesn't come on either, but, I figure that none of the dashlights other than the turn signals work, so not sure if it's a fuse there or not...

I've had the jeep for about 5 months now and only recently tried using the 4wd, it was working when it was sold to me though. The stalling issue is VERY recent, and I just replaced the fuel filter to see if that helped (It didn't)

The reason I'm thinking it might be the carb is it isn't a matched carb to the vehicle, I honestly have no idea whatsoever what type of carb it is, but the PO said that the original went on him (Didn't specify how) and that he didn't want to pay for the correct replacement. I got it as a learning/project vehicle so this didn't bother me too much. Now I'm wondering if my problems could be traced to it though. What say you YJ Gurus?

(Either way I'm thinking of getting a Weber to replace the carb in the next month, but, well, I want to solve the issues first if it's not likely to be the carb)
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Old 03-02-2014, 02:29 PM   #2
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I have an 88 with the 4.2 and had a similar experience. My problem was with the automatic choke. It would warm up fine but stall when I put in gear. Every change of season I had to readjust the choke. I finally added a Howell throttle body injection in place of the original carter carb. Runs great now. As far as the 4WD is concerned I can't help much....One of the plastic vacuum lines broke once and the vacuum switch on the transfer case broke also which kept it from engaging.

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Old 03-02-2014, 02:55 PM   #3
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Its hard to say for sure without knowing which carb it currently has on it. It could very well be a choke issue. Or, since it doesn't have a carb that the computer can control anymore, it is trying to control the spark instead.

It could also be the ECM is bad, and not allowing it to run correctly. Usually when they go bad, it wont start at all. But I have seen them do weird things like allowing the motor to idle but not rev up, or allowing it to run down the road fine but not idle. What's the condition of the air cleaner element?

The front end is controlled by a vacuum switch on the t-case, that switches when you pull the lever back into 4wd. The vacuum travels from this switch to the CAD (center axle disconnect) which is on the passenger side of the front axle. On the t-case switch is 4 vacuum lines. RED- is vacuum coming from the engine, YELLOW- is vacuum to the CAD to engage 4wd, GREEN- is Vacuum to the CAD to disengage 4wd, BLUE- is used for a space for the vacuum to release to, so it can be switched from yellow to green.
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...
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