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post #1 of (permalink) Old 09-11-2003, 10:15 PM Thread Starter
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engine issues on 81 CJ

my 81 CJ7 has the 258 inline six. It normally fires up very nice and quick, but if it's been sitting for a few days it will not start. You need to pour gas down the carb to get it going. Does this sound like a bad carb, maybe the float? Or would it be the fuel pump. It also idles very rough. Above 1000 RPM it is fine, but at idle it is no good. sound like just bad timing or maybe a vaccum leak? These would all be easy problems to address if I had access to the jeep, but I am at college now and want to know what to look for when I get home. thanks.
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post #2 of (permalink) Old 09-12-2003, 06:22 AM
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Re: engine issues on 81 CJ

What carb? Sounds like a vacuum leak is your big culprit. While the engine is running spray carb cleaner at suspected leak locations around the carb. When the engine stumbles you have found a leak. It may be a hose which can be trimmed or replaced, or it may be the gaskets in the carb itself which should be replaced as tightening them usually, at best, is a temporary fix. Good luck.

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post #3 of (permalink) Old 09-12-2003, 08:06 AM
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Re: engine issues on 81 CJ

the sitting for a few days/not firing is just the fuel running back to the tank. mine does it too.
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post #4 of (permalink) Old 09-12-2003, 08:43 AM
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Re: engine issues on 81 CJ

BBD carb bad inner diameter on the idle tubes the clog easily and all the time the only fix is to take them out and drill them to .0325 or get a new/different carb (as far as idle goes) if you want a replacement KRAGEN.com sells a holleyII they say is a bolt in replacement, but remember a carb has lots of moving parts all are not lubricated and the linkage wears into the casting of the carb, allowing air and fuel to leak in/out.
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post #5 of (permalink) Old 09-16-2003, 06:44 PM
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Re: engine issues on 81 CJ

Hope you fixed your problem. I was looking for a solution to my problem on this site and found this link - it may help you out. I'm not having the idle issues that it describes, but will take a look anyway. I'll pretty much do anything on my jeep to get out of having to play cards with my wife's friends [img]images/graemlins/smile.gif[/img]


A similar issue I had when I first got my 82 CJ7 jeep was I replaced the fuel filter and it would run like crap and stall. Put the old dirty fuel filter back on and it worked fine. Put the new filter back on along with a new fuel pump - problem solved.


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