If the ignition timing is off by a few degrees, it can cause the temperature inside the engine to rise enough to lead to the conditions that cause dieseling. #9. 5) Lower octane fuel could aggravate the problem, because it will self-ignite quicker than a higher octane fuel. Ive read that the best fix for dieseling is an electric solenoid in the fuel supply system to instantly stop fuel pressure once the engine is turned off. When I got envolved the initial timing was set at 12 degrees BTDC. The problems that arise from an engine vacuum leak can be more than annoying. Anorak, Jan 10, 2009 #10. Next: Dieseling is generally caused by idle speed that is set too high and not allowing the engine to idle for a couple minutes after a long high speed run. The timing needs to be advanced enough so it idles fast enough that the carb can be set down far enough so the primary is closed and the engine is idling only on the idle circuit. But it alone won’t cause the problem. However timing too far advanced can cause an overheating engine which can attribute to over-run. So it's not good for the engine, because, like with pinging, you can also get it firing at the wrong point in it's cycle causing big shock loads internally. Combine the poor spark with the retarded timing (running rich) for several months and #6 is likely extremely dirty. Gramps said: How can advanced timing cause dieseling? From what I understand, contributing factors can be excessively high idle speed, carbon deposits that remain hot enough to ignite after spark is gone, deposits on plugs/too high of a heat range. At first there was no problem, then after about 1000 miles, I started getting the dieseling. From my online research, I've read that thick carbon build-up cracks apart and the edges glow red hot, which can cause dieseling. The timing itself won’t cause the run on as the ignition is switched off when the run in occurs. Dieseling is caused by the same stuff that causes pinging; basically the cylinder is hot enough to keep firing without a spark (hence the name). Check the workshop manual for the timing procedure. Yes, timing that is advanced to far, faulty fuel systems, over heating and carbon build up can all cause this but those are less likely causes. Some cars set the timing at idle, others set it at a high engine speed. The main cause of dieseling is poor gas. The ignition is off when it's doing it, no? How can advanced timing cause dieseling? The ignition is off when it's doing it, no? Yes, timing that is advanced to far, faulty fuel systems, over heating and carbon build up can all cause this but those are less likely causes. I used to get dieseling in a 66 Coronet with a modified 383 and for some reason it did it much more frequently when using regular gas vs. premium. After the motor blew and rebuilt, I put everything back EXACTLY like it was. Any Of The Following Could Cause Or Contribute To Engine Stalling Problems: An Engine Vacuum Leak. Actually too hot of a spark plug might cause it too. If the gas has high enough octane, you can adjust the carb correctly and it should work. Even with 10-12* initial timing, there was no dieseling problem. The more information you can get out of them the better; because you’ll likely need as many details as possible to narrow down the list of potential causes. Another possible cause could be too far advanced ignition timing but that would most likely causing pinging (pre-ignition) as well. If the cam being advanced was the problem, it would have shown itself previously. Joined: Jul 23, 2004 Oddometer: 56,803 Location: San Rafael, Marin County. It can vary widely from car to car. I changed it to 10 degrees and no change to the desieling. After triple checking the engine timing and carb fuel mixture settings Im still occasionally dealing with engine run-on. 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