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Rough idle following spark plug change

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Old 03-30-2019, 06:59 PM
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Default Rough idle following spark plug change

Changed spark plugs and removed my hcv on my 95 converting it to the 97 hose setup. Everything went well until I noticed the Jeep idling rough. Seems like the sound is a muffled clapping coming from the middle of my exhaust manifold. Any issues that could’ve come up from this repair? Any help is appreciated!
Old 03-30-2019, 07:12 PM
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You could have bad wires that moving around was the last straw before breakage. Did you also replace the cap and rotor for the distributor or the wires from the coil to the cap and from the cap to the plugs?
What was the condition of the previous plugs?
Old 03-30-2019, 07:14 PM
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I re-read. You could have spilled coolant into the distributor. Ensure that that is clean and dry as well as the holes for the spark plugs.
It could theoretically be coolant around the spark plugs. You would have to have coolant fill the level from the bottom of the hole to the top of the plugs and have it connect inside of the boot to have trouble there.
Old 03-30-2019, 08:43 PM
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Originally Posted by gat
I re-read. You could have spilled coolant into the distributor. Ensure that that is clean and dry as well as the holes for the spark plugs.
It could theoretically be coolant around the spark plugs. You would have to have coolant fill the level from the bottom of the hole to the top of the plugs and have it connect inside of the boot to have trouble there.
i only replaced the plugs and the wires from the distributor cap. Did not replace cap or rotor. Double checked my fire order was correct. Will need to check for fluid in the spark plugs in the morning.
Old 03-31-2019, 08:41 AM
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Did you check for fluid under the cap even though you didn't replace it nor remove it? It is very easy to remove. It is two captured screws that need unwinding. If you're in there, then examine the rotor for spring as well. Both the rotor and cap are wearing parts that are to be periodically replaced.
Old 03-31-2019, 10:14 AM
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Originally Posted by gat
Did you check for fluid under the cap even though you didn't replace it nor remove it? It is very easy to remove. It is two captured screws that need unwinding. If you're in there, then examine the rotor for spring as well. Both the rotor and cap are wearing parts that are to be periodically replaced.
$20 for the cap and rotor at the local parts store. Gonna head into town this afternoon to try that.
Old 03-31-2019, 04:43 PM
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Originally Posted by gat
Did you check for fluid under the cap even though you didn't replace it nor remove it? It is very easy to remove. It is two captured screws that need unwinding. If you're in there, then examine the rotor for spring as well. Both the rotor and cap are wearing parts that are to be periodically replaced.
changed the cap and rotor out and tried burping the coolant system..still getting a strange idle
Old 03-31-2019, 08:03 PM
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How long have you idler or driven since this issue? I'm thinking that getting to temperature would evaporate any spillage.

It may be that this had nothing to do with the other.
Old 03-31-2019, 09:00 PM
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Around half hour highway speeds. Must be something else I triggered or brought to the surface
Old 03-31-2019, 09:22 PM
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I'd try to diagnose now. What is the pressure for the fuel at the rail? You can "rent" a free gauge for this from O'Reilly's et cetera. What is the voltage cold and running from the starter to the ground bolt on the block? Measuring this way reflects what the vehicle is experiencing. Compare those measures with post to post of the battery in the same two conditions.
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