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Ignition advanced, can't adjust, part II 700 1986

"Does the timeing mark move while you look at it or is it dead set at 12tdc or what its currently set at?"

The timing mark is very steady. Every time I re-check the timing, the mark is where I left it. When I increase the engine speed the timing advances. Pretty much like every other Volvo I've had.

I probably won't pull the distributor, as this is the stumper-

Whatever the PO did to the car, it really doesn't matter. The story is-

Car ran great. Drove car one day, and after a little hard driving, car doesn't run that great anymore.

So it seems like the $64K question is:

timing- is this the chicken or the egg? Could something I've yet to ID cause a great change in the timing? OR is timing the egg- can some other part of the car fail (ie fuel delivery) and cause the EZK to advance the timing to correct for it?

Thanks to everyone for all the help.

Dylan






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