Aloicious
June 12th, 2008, 05:22 PM
Okay, so I'm trying to adjust my IAC and ran into some oddities. first off here's some info on the vehicle and conditions:
1996 chevy c1500 5.7L L31 running a 411 PCM, 75mm TB (stock is 72mm) with the TB blade deflector removed, ZZ4 cam, MPFI running Bosch 890 24# injectors. Tune is OLSD, tune attached below
IAC adjustments all done at temp (94*c) while idling.
RAFIG has been done several times and was stabilized around +- .20 in most cells from 20* up thru 94*, although the last time it was done was a few weeks ago. RAFPN hasn't been done as much, but was done about 2 weeks ago.
so after some adjustments I got the IAC steps in P/N at about 58-60 (before adjustment it was around 80-85), but in gear, the best I could get it at was around 103 (before adjustment it was around 130). my desired Idle in gear is set at 700, and in P/N its 770. I also reset the TPS afterwards to set it back to zero.
while adjusting the blade it started acting strange. I would get the in gear IAC steps down to 100 (started around 130), and either direction I would adjust the throttle screw the IAC steps would go up (opening or closing blade.) any ideas what's going on there? (IAC steps in P/n are more stable, I can take it down to about 43, it won't go any lower, but also doesn't go back up, so I'm guessing that is with the set screw all the way out.)
Okay, so in the other threads I've read, everyone says to get the IAC steps around 40-70 steps idling at temp. is that in gear, or in P/N? if it's in P/N It should be doing good, but is 100 steps in gear too high?
well, its about midnight here, so hopefully this thread makes some sense. thanks for any help out there.
1996 chevy c1500 5.7L L31 running a 411 PCM, 75mm TB (stock is 72mm) with the TB blade deflector removed, ZZ4 cam, MPFI running Bosch 890 24# injectors. Tune is OLSD, tune attached below
IAC adjustments all done at temp (94*c) while idling.
RAFIG has been done several times and was stabilized around +- .20 in most cells from 20* up thru 94*, although the last time it was done was a few weeks ago. RAFPN hasn't been done as much, but was done about 2 weeks ago.
so after some adjustments I got the IAC steps in P/N at about 58-60 (before adjustment it was around 80-85), but in gear, the best I could get it at was around 103 (before adjustment it was around 130). my desired Idle in gear is set at 700, and in P/N its 770. I also reset the TPS afterwards to set it back to zero.
while adjusting the blade it started acting strange. I would get the in gear IAC steps down to 100 (started around 130), and either direction I would adjust the throttle screw the IAC steps would go up (opening or closing blade.) any ideas what's going on there? (IAC steps in P/n are more stable, I can take it down to about 43, it won't go any lower, but also doesn't go back up, so I'm guessing that is with the set screw all the way out.)
Okay, so in the other threads I've read, everyone says to get the IAC steps around 40-70 steps idling at temp. is that in gear, or in P/N? if it's in P/N It should be doing good, but is 100 steps in gear too high?
well, its about midnight here, so hopefully this thread makes some sense. thanks for any help out there.