Help with rough idle -

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post #1 of 5 Old 04-02-2013, 02:07 PM Thread Starter
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1989 YJ Wrangler 
Join Date: Nov 2012
Location: clementon
Posts: 39
Help with rough idle

I have an 89 wrangler with a 4.2 that has a rough idle and at cold starts surges. This started after I replaced the distributor and spark plugs. I didn't replace the cap, rotor, or wires because they were replaced only 5000 miles ago. I checked all the vacuum lines which was not easy. I did the nutter bypass when I rebuilt the engine 5000 miles ago. The carb is brand new also replaced when the engine was rebuilt. I replaced the distributor because the vacuum advance was bad. The ignition module and capacitor were replaced just before the engine was rebuilt. Does anyone have any suggestions because I am out of ideas of what to check and I don't want to pay for something that I could easily check myself?

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post #2 of 5 Old 04-02-2013, 02:24 PM
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1990 CJ7 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Add a dedicated ground to the black wire in the 3 wire bundle coming from the distributor.

Double and triple check your firing order. And change the plugs and wires one at a time to see if you have a bad one or damaged one while working with them.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #3 of 5 Old 04-02-2013, 03:21 PM Thread Starter
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1989 YJ Wrangler 
Join Date: Nov 2012
Location: clementon
Posts: 39
Yeah I forgot to say that i tried grounding out each plug to see if any one cylinder was getting the misfire but that didn't help at all i would get the 1 cylinder misfire along with the other intermittent misfires on all 6 cylinders. I will try the dedicated ground though thanks.
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post #4 of 5 Old 04-02-2013, 03:54 PM
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
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If it is nuttered the you need to add the dedicated distributor ground Old 4x suggested.
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post #5 of 5 Old 04-02-2013, 04:11 PM Thread Starter
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1989 YJ Wrangler 
Join Date: Nov 2012
Location: clementon
Posts: 39
ok I added the ground wire and that did nothing. Let me make sure I understood what you meant. I took the black wire from the distributor cut it. Then I spliced those 2 wires with a new wire and ran the new wire to the ground side of the battery.
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