Quote:
LEAN CRUISE:
a. The $0D mask does not have the ability for spark advance during lean cruise.
however, there is a work around if you don't run an EGR valve. I'm going to reveal
another one of my secrets here. This actually works very well. If you don't run an
EGR valve, which I don't, you can leave the qualifiers set to enable EGR, disable
error 32, and set the Desired EGR table and the Fuel Reduction % w/EGR on table to
all zero's. By doing this you will have zero % EGR commanded as well as zero fuel
reduction (remember you are doing this with lean cruise) but the EGR Spark
Correction table will still apply. You can then set this table to add spark where
you are removing fuel with lean cruise.
As for what you should do to tune open loop fuel safely. That is simple, remove
your cat. Here's what I did, I took my old tired original cat and gutted it. I
then bought a cheap universal Catco converter from Summit and fabbed up the pipes
to be able to replace it when it is time to pass the sniff test, then I remove it
after testing. Cost me like $60 total. This accomplishes two things. I am running
a gutted cat for 51 weeks out of the year and when I do install a cat for testing,
it is like new and a new cat can be very forgiving when getting sniffed. HTH
b. enable open loop and the AFR vs VAC vs TEMP table can be used for lean cruise