How to diagnose and repair a miss? - 77 CJ5 258 w/ 1bbl carb -
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Unread 03-09-2014, 02:45 PM   #1
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1985 CJ7 
Join Date: Oct 2011
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How to diagnose and repair a miss? - 77 CJ5 258 w/ 1bbl carb

So I've been helping my nephew work out a few issues with his 77 CJ5. When I got here it would not charge so we got that sorted out and replaced a gauge. Once that was done it was running great so he went ahead and changed out his worn our tires. Yesterday he took it out to run a few errands. When he left the store he was at he noticed that from the time he started it up it had a miss that hasn't been there before. As he drove the miss seemed to get a little bit worse. The way he described it - at lower acceleration it wold miss real bad but when he would get on it a little bit and get into the higher RPM's it would get better.

This jeep has the stock 1bbl carb and points style ignition. The carb was recently rebuilt by a mechanic and has worked great since. The plugs are not fouled and the plug wires are relatively new - what is the best way to diagnose what is causing this miss and fix it? Any help is greatly appreciated.

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When I was insolent, I was placed in a burlap bag and beaten with reeds. Pretty standard, really.[/FONT]
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Unread 03-10-2014, 04:53 AM   #2
Mike Romain
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1986 CJ7 
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A miss can be a lot of things. I would first be checking the inside if the distributor cap for carbon tracks and be looking at the condition of the points while in there.

Next I usually take a spray mist bottle of water and I lightly spray the distributor cap and wires with water while it is running in a dark place or at night. If I get a 'light show' off the wires, they need replacing.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
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Unread 03-10-2014, 04:06 PM   #3
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1981 CJ5 
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Check the points gap. They have been known to change. No feeler gauge, got a paper match?
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Unread 03-11-2014, 06:49 PM   #4
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1978 CJ5 
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Points in a 77?

Another thing - Check for leaking intake gasket. Very common.

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