Cal

iTrader: (1)

I always knew the PCM makes the stock engine "rev down" slowly for some reason (emissions?) but now that I put the cam in, it is much worse; almost a cruise-contol effect. I haven't done any PCM tuning yet so it's not caused by editing. Anyone know how to fix this with LS1edit?

SmaknaSS

iTrader: (1)

I noticed that too, I would also like too know.

pekkaz

I have not adjusted that myself but would assume increasing values in P/N airflow decay should do the job.

Cal

iTrader: (1)

OK thanks pekkaz, but I assume you mean "Airflow Decay in Gear" since P/N stands for Park/Neutral. Since I have a M6, I assume I would just adjust the values for all of the gears since the PCM has no way of knowing which gear I'm in.

pekkaz

Ok, I was confused by the 'rev down'. Another thing to look at is if you have too much on the in gear row in the "Idle Air". Dunno how 'Airflow Decay in Gear' works with M6.

Ragtop 99

iTrader: (7)

did you drill out the TB hole? If you did, then more air is getting in when your foot is off the gas.

more air = more power = don't slow down as fast.

Cal

iTrader: (1)

No, haven't drilled the TB hole yet. Sounds like maybe I shouldn't, either.

Cal

iTrader: (1)

Noticed something interesting about this problem: if I push in the clutch, the rpm comes right down like it should; but if I pop it out of gear without using the clutch, the rpm floats down very slow! It's gotta be the PCM causing this . . .

Cal

iTrader: (1)

OK got the problem fixed . . . I verified the PCM was causing it by unplugging the IAC, and sure enough it worked great. So I plugged it back in and edited the P/N Airflow Decay and the Airflow Decay in Gear to the max values allowed by LS1edit. Problem fixed! Now I can take my foot off the gas and actually slow down! Thanks to everybody for your help.

Bink

What max values did you enter??? Where did you get the max values??

Cal

iTrader: (1)

I should say the maximum integer value, 31.0, it will accept up to 31.99. I just kept putting in larger values until LS1edit would not accept them; you get the error message "This value is out of the byte range" if you put in too big of a number. I also got pretty good results by just using the largest value that was already in the table: 1.0.

Bink

Thanks man!!!! I did this after reading this post .Both decay tables.Helped alot.
joel(Binksz06)

Cal

iTrader: (1)

blinksz06, I found out last night the changes I had made to the decay tables hadn't taken full effect because I hadn't done a PCM relearn procedure. Once I unhooked the battery for a while, problem was totally solved! No more delay before the decay starts.