Rough Running
Thread Starter
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Joined: Apr 2003
Posts: 83
Likes: 0
From: Houston Texas
Rough Running
Last week my 1977 L82 started running very rough
(it was missing). I replaced the rotor, coil and distributor cap. it still ran rough. Replaced plugs and wires. Problem fixed!! This morning it started missing again. Anybody got any ideas what to check??????
(it was missing). I replaced the rotor, coil and distributor cap. it still ran rough. Replaced plugs and wires. Problem fixed!! This morning it started missing again. Anybody got any ideas what to check??????
Thread Starter
Advanced
Joined: Apr 2003
Posts: 83
Likes: 0
From: Houston Texas
schmucker
I haven't checked the timing yet. It did run very well for 1 day and as i was driving in this morning it began to idle rough and sounds like it is missing when you get on it.
Robb
I haven't checked the timing yet. It did run very well for 1 day and as i was driving in this morning it began to idle rough and sounds like it is missing when you get on it.
Robb
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
Timing won't cause a miss. If you have an IR electronic thermometer, shoot the temp of the exhaust ports to identify the cylinder that's missing (cool port) and troubleshoot ignition and valvetrain issues back from there.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Originally Posted by RRROBB
Last week my 1977 L82 started running very rough
(it was missing). I replaced the rotor, coil and distributor cap. it still ran rough. Replaced plugs and wires. Problem fixed!! This morning it started missing again. Anybody got any ideas what to check??????
(it was missing). I replaced the rotor, coil and distributor cap. it still ran rough. Replaced plugs and wires. Problem fixed!! This morning it started missing again. Anybody got any ideas what to check??????
Put some Drygas (or similar water absorbing stuff) in the tank and drive it for a bit.....
Instructor
Joined: Aug 2004
Posts: 139
Likes: 0
From: Austin Tx
Check the plug wires at each end and make sure they are pushed on tight. I installed new plug wires a couple of weeks ago and had the same problem as you, started up and drove it and all was ok, next time it had a miss. I found one wire at the distributor was not pushed on properly. Works fine now.
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Burning Brakes
Joined: Dec 2004
Posts: 858
Likes: 6
From: Hobe Sound FL
77 Running Rough
Get a Dr. ReBuild Vacuum Line Kit for the entire carb, intake, air cleaner
and smog pump vacuum lines. This may take care of your problem, and definitely take care of any backfire like symptoms when you are running the engine up and letting off the gas when in neutral.
and smog pump vacuum lines. This may take care of your problem, and definitely take care of any backfire like symptoms when you are running the engine up and letting off the gas when in neutral.