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#1
09-04-2006, 09:37 PM
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ENGINE RUN ON
I am working on a 20k mile L78 Camaro. The car always ran fine but the carb was leaking so the owner rebuilt the carb he also tuned it up points plugs cap wires. The smog was off the car so he also reinstalled that. He brought it over because it now runs on when it gets hot.
Heres what i did checked timing and set it at 4 relaced the carb with a known good one replaced heat riser because the old wasnt opening and disconnected hoses at the check valves and plug them The car still runs on any suggestions.
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69 RS SS L78 conv 69 RS SS ZL1 69 L78 Chevelle conv 69 L78 Nova 69 L34 Nova 67 SS Chevelle 73 Trans Am 
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#3
09-04-2006, 10:07 PM
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Re: ENGINE RUN ON
Is this an automatic or manual transmission L/78?
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#4
09-04-2006, 10:38 PM
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Re: ENGINE RUN ON
What rpm is it idling at and what kind of fuel is he running in it?
Eric
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#5
09-04-2006, 11:10 PM
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Re: ENGINE RUN ON
you can try a colder plug, or one that does not a projected nose. More octane. If an auto, shut it off in drive, remember to place lever in park. Run on is essentially dieseling that is fired by a hot spotg in the combustion chamber. Some carbs have a solenoid to prevent this.
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Dean
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#6
09-04-2006, 11:38 PM
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Re: ENGINE RUN ON
Its a four speed car its idling around 850 rpm premium unlead with Hodell octain and lead additive. Remeber it didnt do this before he changed everything. Eric how long of a wait to have a carb rebuilt.
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69 RS SS L78 conv 69 RS SS ZL1 69 L78 Chevelle conv 69 L78 Nova 69 L34 Nova 67 SS Chevelle 73 Trans Am
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#7
09-05-2006, 03:28 AM
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Re: ENGINE RUN ON
If nothing except the points and condensor were changed in the distributor, like the springs, wieghts, VA, then I would retime it. Disconnect the VA, set the total timing at 36-38, hook the VA back up and drive it. I think the 4 you have is too slow.
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Tony 55 Nomad Gasser 70 SS 427 Nova 34 Ford Sedan..Hemi powered Michigan/ Florida
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#9
09-05-2006, 08:08 AM
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Re: ENGINE RUN ON
When you reinstalled carb.and started for the first time did you have to increase idle speed screw?If so it may have been necessary,to cover up a vacuum leak.Check your work.The more the throttle plates are open the better chance for run-on.
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"Knowledge is good" Emil Fabor 67 L/78 Camaro SS/RS H-H,1W,2LGSR,3SL,4K,5BY. (Sold) 70 L/78 Nova M-21,Black Cherry,Sandalwood Int. 09 Pontiac G8 GT Premium,Sport,Roof. Liquid Red.
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#10
09-05-2006, 08:24 AM
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Re: ENGINE RUN ON
John;
A basic rebuild is only a 2 or 3 day turn-around normally, and restorations are running about 1 or 2 weeks right now. I also agree on bumping the timing up a little to see what happens. Are the plugs stock heat range? Is there any spark rattle under normal driving conditions? Eric
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