> > What we found was that from a part throttle to WOT "stab", the truck
> pinged
> > and only the timing had a delay of about 1 second to change settings (all
> > other sensors reacted a lot faster), causing the truck to run at WOT and
> at
> > 40 degrees BTDC. This definitely will cause pinging.
Bernd,
Just say the word, I'll shut up & go to lurk mode.
Does this engine have a knock sensor? In my experience,
you can get pretty brave with timing if the knock sensor is there to
protect you.
MaMopar appears to be pretty consistent with software practices
among her OBD-II PCMs. I want to preface this, by saying that
I learned it from the Neon PCM info that I've encountered..:
I know that at least "some" of the CC PCM's employ
a block learn matrix for both fuel & spark. The spark learning
involves both long & short term tables. These get cleared if you
reset your PCM by disconnecting the battery. In a nut shell,
if the PCM detects knock at a specific MAP & RPM value,
it will subtract some timing from the calc for that location in the table.
This is done to adjust for sh*tty gas and maybe even oversights in the
calibration. Just to help me get up to speed in the Dak world, which
engine/year applications had no knock sensor? I was under the
impression that it was a requirement of all OBD-II PCM's
Thanks,
Mike V
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:50:49 EDT