post #1 of Old 04-25-2002, 11:36 AM Thread Starter
mrjoshuaw
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1977 CJ7 
 
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Post 77 cj questions

Have a 77 cj with a 258 one barrell carb that I have had numerous work done on. The recent problem is that it has no pickup. Giving it more then half of the gas pedal causes it to act like it is wanting to die, but it never does. The only time that it does not do this is when it is going down hill. It has a rebuilt carb (less then a year), new fuel pump, new fuel filter, but it had some recent electrical work done and it started acting up this way after that. I was curious if it would be to much gas or not enough? It almost sounds like it is getting to much gas, but in park or nuetral can floor it and it sounds great. And it idles fine. Have had numerous comments on how good the engine sounds for being original and no major repairs to the engine it self, but of course that is when it is in park and not on the road. Any help would be appreciated.


"In the End Everything is a Gag...." Charlie Chaplin
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post #2 of Old 04-25-2002, 11:56 AM
Holiday
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I've had this problem several times on my CJ-5 with a 258, especially with the factory carter carb. Make sure you have the correct jets install, make sure the floats arent stuck, check your fuel filter, and lastly, get some soapy water an check to make sure you dont have any vacuum leaks in any of the hoses. If this still doesnt work, throw away the carter (as they always have problems anyway) and put a holley 350 cfm on there. You'd need to jet it down and make an adapter plate for it. Or even better yet, get a throttle body kit from howell or holley ( if you have an extra $1000 ). But I would first check out for vacuum leaks and the floats. If you have a manual or electric choke , that could be sticking too. If so, spray it with some carb cleaner. If you decide to scrap the carb, I think I have a barely used weber lying aroud with all the linkage for that engine.
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post #3 of Old 04-25-2002, 02:23 PM Thread Starter
mrjoshuaw
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Talking

Thanks for the info. I'll check it out. The thing that gets me is that it still gets good gas mileage for the year and motor. (17 MPG) It is a street jeep only and the mileage is great for that use. I do not know much of anything about engines so I have been cutting my teeth on this thing. Once again thanks for the info.

"In the End Everything is a Gag...." Charlie Chaplin
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post #4 of Old 04-25-2002, 02:32 PM
4wheeler4CJ
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A stock 258 motor (possibly even tired?) will not benefit from a 350cfm carburetor, simply too big. The Carter YF, believe it or not, is a very simple and reliable carburetor! I ran a 1BBL Carter for years on my old '77 258 CJ-7, before I built a high-performance 258, and I simply rebuilt it once (when I first got the Jeep), and never had a problem, ever, not even adjustments.

I sold a Carter YF 1BBL to a guy in California on Ebay, he bought it simply so he could pass emissions, then he put his other carb back on. He had modified his motor, and couldn't pass because of the size of his carb. The trusty Carter YF ran clean and great!

When i finally did my performance 258 for that '77, I had a lumpy cam, performance head-work, dual exhaust headers w/custom 2 1/2" exhaust, aluminum 4BBL intake, and I ran a Holley 390 cfm 4BBL. Even with the performance mods, I have to admit, that carb was too damn big. Even after rejetting it (you can only jet so low before it just won't run right), it still ran so rich, your eyes would burn standing behind it.

It sounds like your problem lies elsewhere. You could have ignition problems under "load", could be starving for fuel (elsewhere than the carb), or a number of other things. If it started after doing the electrical work, tho, that should tell you where to start looking. <img border="0" title="" alt="[Wink]" src="wink.gif" />

Don't condemn that Carter YF, hell they were used all the way back to the damn CJ-2A and if they were that bad, they wouldn't have been carried that long, LOL.
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post #5 of Old 04-26-2002, 06:24 AM
Holiday
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No offence, but you should hear ( and smell) my 258 with my 350 cfm holley run. Its runs great! The only problem I do have is a slight loading up at extreme angles, but nothing too bad. I admit, it did take a lot of adjusting and playing around with jets, but its been great for 5 years now.
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