I have a bit of a problem car I'm working right now, it has been to several different shops, and has had the parts cannon shot at it a few times. It is a C5 Corvette with a 383, cam, heads, etc, manual trans. The runs and drives pretty good, but has what feels like an engine miss, some call it a "burble" at around 5500rpm. It only lasts 1/2 a second, and you can drive through it, and the car will continue pull to 6K and above, but it is very annoying and kills acceleration. I was datalogging a few dyno pulls today and had Engine RPM (SAE.RPM) and Engine Speed(GM.RPM24x) up on the same log. I have never really logged the two together and was curious if somebody can shed some light on how they are different. Neither PID ever matches throughout the pull, and when the "miss" happens, Engine RPM(SAE.RPM) jumps to about 1000 RPM above actual RPM for a split second and then goes back to normal, Engine speed(GM.RPM24x) doesn't move form normal. My original thought on this car was a damaged reluctor wheel, the owner swears it has been checked and rechecked and it is good, but I'm wondering if what I'm seeing is a reluctor wheel issue.
Does anybody know how these two pids are calculated and why they would be different?
The owner has changed crank sensors, cam sensors, ecm's, wire harness, plugs wires, plugs, coil packs, injectors, Map sensor etc, etc, Parts Cannon Kaboom!
I don't know much about the engine, or cam specs, other than it is a 383, and has a Callies crank.