Jeep yj 4.2l wont idle and back firing.

[Timlt1]

My 87 yj is running like crap again. It did this once before and just cleared up on its own. I have no vacuum leaks, half tank of good gas, good fuel filter, was tuned up 3 months ago. If it idles it will be at 500 rpm and sound rough. Any ideas??

 

[Timlt1]

Oh and it started happening after a 45 min ride on the highway.

 

[Gennybro]

could be that you need a new distributor, my friends ford f150 was doing that.He eventually changed the distributor and that fixed the problem.

 

[Timlt1]

It very well could be. I was also thinking it might be clogged jets.

 

[superj]

only one way to find out, pop the top on the carb and pull them out. seems like it would be a better possibility since it happened after a long drive. maybe a part of the fuel hose came off and got into the carb or something

 

[69jeepcj]

Have you checked the spark plugs to see if they are wet with gas or covered in oil. fouled out plugs is a possibility. I am fouling out plugs in my jeep from time to time because of a screwed up carb and I know when it happens because it starts running like crap.

 

[Timlt1]

Has anyone pulled this carb apart? What do I need before I get into it?

 

[superj]

which kind of carb is it?

 

[Timlt1]

I'm not sure but it's a 87 4.2l if that helps.

 

[superj]

nah, could be any. take a pic and then we can tear it apart

 

[JJs 88 Wrangler]

Its probably a Carter. Thats what is on my 88. I had mine rebuilt, and it runs great now.