|
Spark Advance?
Thanks kilroypr for all your help.
Tell me what do you think about this:
I recently bought OBD-II PC adapter and software for laptop from Car Code. It is nice piece of diagnostic and can monitor some parameters like O2, TPS, FuelTerms, RPM, VSS, MAP, MAF, CTS, Spark Advance, etc.
First time when I tried it I did not know how to translate data log and get some useful info.
I gave it try yesterday again. Whenever I noticed hesitation problem, computer showed significant Spark Advance drop (retard), despite TPS was 40-50 % opened and RPM 2500-3000.
Normally, in idle and low RPM timing showed 20º which is I believe right. It would advance spark at 3000 RPM up to 32º which again should be expected but when car hesitated and had poor acceleration, it showed retard to 10º-15º at 2600-2700 RPM.
This retard spots corresponded to speeds around 35 MPH (3rd gear shift point) and 45 MPH (4th gear shift point) though I noticed such a retard at 60 MPH as well.
No such a retard at speeds from 0-35 MPH and lower gears where I do not notice the problem.
Now that was weird isn’t it?
Any thoughts anybody?
|