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Missing and more missing
https://slantsix.org/forum/viewtopic.php?t=59587
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Author:  Jet Screamer [ Tue May 03, 2016 8:26 am ]
Post subject:  Missing and more missing

Greetings. I have a '71 Dart Swinger with a slanty. The car has 34,000 original miles, practically a brand new car. The problem I have is that the engine is missing something terrible. When it's a cold start it seems to run fine, but as it warms up it starts missing and gets progressively worse until it quits running, although it seems to run fine when driving. Quite a few things have been replaced. When I got the car I upgraded to a new distributor with Pertronix "points" and a Flamethrower II coil. New plugs, wires, cap. The 1920 carb that was on it leaked, therefore changed the carb. None of these things have changed the idling. I have adjusted the timing to 5 btdc, and adjusted carb idle needle. It seems to be running really rich, but when I try to lean it out it dies. I have plugged up every vacuum port that I could find to see if I had a vac line leaking but that didn't isolate the problem. Does anyone have an idea what could be the problem? Thanks!

Author:  Doctor Dodge [ Tue May 03, 2016 8:43 am ]
Post subject: 

Have you checked the valve lash?
DD

Author:  Joshie225 [ Tue May 03, 2016 8:57 am ]
Post subject: 

Yep. Tight valves can be okay cold, but idle terribly when warm. I bought a car where someone confused the lash numbers and set the exhaust tight and the intake loose. You want .010" on the intake and .020" on the exhaust, hot.

Author:  SlantSixDan [ Tue May 03, 2016 9:06 am ]
Post subject: 

See valve adjustment procedure here and tune-up parts and technique suggestions in this thread. You may also be dealing with a vacuum leak (manifold-to-head gasket, for example) that opens up when it gets hot.

Author:  Jet Screamer [ Tue May 03, 2016 7:18 pm ]
Post subject: 

Cool, thanks for the info, I appreciate it. I will make that my next step in my troubleshooting.

Author:  Jet Screamer [ Thu May 19, 2016 6:17 pm ]
Post subject: 

After checking with carb cleaner, I found that 3 & 4 cyls had a big leak at the intake. I replaced the manifold gasket with a Remflex. That solved the problem. It still runs a bit rich to me, so a little tuning should hopefully finish it up. Thanks for all the suggestions and help!

Author:  Nicademas [ Thu May 19, 2016 7:39 pm ]
Post subject: 

Quote:
Yep. Tight valves can be okay cold, but idle terribly when warm. I bought a car where someone confused the lash numbers and set the exhaust tight and the intake loose. You want .010" on the intake and .020" on the exhaust, hot.
Was it a car or a truck? :roll:

Author:  Joshie225 [ Thu May 19, 2016 8:59 pm ]
Post subject: 

1967 Valiant.

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