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Old 07-18-2009, 09:59 AM   #1
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88 Wrangler misses/dies at low idle

Trying to figure out where to spend $$ first on this....... 88 wrangler 4.2 , Carter 2 Bbl with 3 speed Auto Trans and about 170,000 miles.

Problem: there is a noticeable miss at low idle; and when pulling out of parking spaces or stopped at traffic lights it often misses and dies. I've adjusted the low idle a little bit but it still happens, mostly around 600 RPM.

I sought the advice of a mechanic (who is a diesel guy and admitted not knowing much about carburetor engines). He put new spark plug wires, plugs and a new rotor in but no fix. He suggested it might be the distributor.

I'm wondering if I should put some kind of different carb in it like a motorcraft?
OR
should I start by replacing the distributor?
OR maybe just both?. Like everyone $$ is tight and I'd like to take my best shot at it first.
Any suggestions appreciated

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Old 07-18-2009, 01:32 PM   #2
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While I will agree that the cater carb isn't from Jeep's best hour, lets try to figure out the problem first. You pulled the plugs. How did they look. I have a 1987 yj with a 4.2L and had a similar problem. My solution was to CORRECTLY time the engine, Correctly route all the vaccuum lines as best as I could, and finally readjust the carb. I found my mixture screws were only 3/4 of a turn out, and at idle the engine was a little shakey. I gave it another 1/2 out and WOW what a difference. Smoother idle and it actually as a bit of power too. This should work on your jeep as well altho' my 87 is running a 1983 non-feedback style carter carb off a late model cj.

Jake
Coviello Racing

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Old 07-18-2009, 06:19 PM   #3
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Thanks for writing back Jake....
I'm not a very good mechanic and I'm not sure what stuff is SUPPOSED to look like...the mechanic took the plugs out as kind of a shot gun remedy.

Where can I look to see what "right" is supposed to be?
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Old 07-18-2009, 07:04 PM   #4
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is the engine running rough or is thare a miss?
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Old 07-18-2009, 09:00 PM   #5
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"correct" plugs are fairly clean, tannish in color with a slight ash to them but the cleaner the better. a decent service manual will serve you well. And I must admit, When trying to correct my rig, I had down the street another totally stock, unmolested 87 jeep to take pictures and make notes on.
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Old 07-19-2009, 11:11 AM   #6
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i would suggest the nutter conversion i'm in the process of doing that right now all the people i'v talked to have claimed it makes the thing run way better
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Old 07-19-2009, 11:56 AM   #7
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i also have the same problem and i sent my idle control cyliniod off for reman bcause it wasnt working its the round thing that mounts on your carb with a power wire and also a vacum line coming to it it is suposed to keep u running at idle or when stopping hold your idle up a little to burn out the extra gas in the carb mabe this works i dont know hope fully it will

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