Post is around 7 years old, another one of those hit and run posts, tells problem but never goes back and tells what was done to correct the problem......

 

Since this thread died a while back and was then resurrected, I don't see any problem with me hijacking it.

How does timing affect "dieseling"? Once the key is shut off, there is no spark, and therefore, timing has no effect...at least it shouldn't in my mind.

Would someone like to expound on this subject? How can spark timing affect dieseling if there is no spark to be timed?

 

If timing is such that you are getting an incomplete burn and eventually building carbon in the CC, I suppose that would contribute.

Hot spots, wrong plugs, wrong idle setting, pooling in the manifold, plus deposits might be contributors. Poor CC design with the sunken pistons will contribute when other things conspire with them.

 

I have never understood that either 72. The thinking is those composites continue to burn after engine is shut down there is a "molten" glob that provides it's own spark, the supposed fix would be to set timing to prevent composites from forming in the first place?

 

The majority of run on peoblems I've seen was fixed by lowering the idle speed.

 

The issue with timing, as I understand it, it advanced timing can increase idle speed which in turn increases the amount of fuel left in the intake, & CC when the ignition is turned off.
I think my problem however, is caused by a leaking intake manifold, which is causing oil to be pulled into the intake tract, causing carbon deposits in the CC.