spark advance at idle
06-07-2009, 10:18 PM
#3
TECH Veteran
Perhaps that is high, but that does not mean timing at any other time will be higher. It does not have to progress in a linear fashion. It can be anything the programming tells it to be. Perhaps dissecting the tune you have would be a good idea (assuming it is non-stock).
06-08-2009, 12:04 AM
#6
Watch what happens when you go wot to redline with the spark advance.
Mine is pretty aggressive, 42deg at the lower rpms but tapers off after 4500 or so to high 30's, and I'm not getting any knock retard.
Too much spark advance would show itself through knock retard long before it would make your car "cut out" I would think. Look at knock retard and if it's excessive, then you might be on to something. Most likely though it has to do with the ignition, with the opti being #1 suspect.
Mine is pretty aggressive, 42deg at the lower rpms but tapers off after 4500 or so to high 30's, and I'm not getting any knock retard.
Too much spark advance would show itself through knock retard long before it would make your car "cut out" I would think. Look at knock retard and if it's excessive, then you might be on to something. Most likely though it has to do with the ignition, with the opti being #1 suspect.
06-08-2009, 12:25 AM
#7
Check your plug wires; if they are routed too close together that will also cause a high RPM miss - ask me know I know!
Watch what happens when you go wot to redline with the spark advance.
Mine is pretty aggressive, 42deg at the lower rpms but tapers off after 4500 or so to high 30's, and I'm not getting any knock retard.
Too much spark advance would show itself through knock retard long before it would make your car "cut out" I would think. Look at knock retard and if it's excessive, then you might be on to something. Most likely though it has to do with the ignition, with the opti being #1 suspect.
Mine is pretty aggressive, 42deg at the lower rpms but tapers off after 4500 or so to high 30's, and I'm not getting any knock retard.
Too much spark advance would show itself through knock retard long before it would make your car "cut out" I would think. Look at knock retard and if it's excessive, then you might be on to something. Most likely though it has to do with the ignition, with the opti being #1 suspect.
Trending Topics
06-08-2009, 12:30 AM
#8
new gm opti, it has been tuned but it had a bad opti on it at the time he was tuning it. he just tried to get it as close as he could, basically guessing. its also running rich as hell which i believe would make it a little more knock resistant
