It's an '89 L98 with mods listed in sig. I adjusted the minimum air according to the posts and articles on this site and now as I come to a stop the rpms drop to about 750 and then rise to about 950 and then drop back down to 750 before the car actually comes to a stop. Are the TB blades too far closed at idle now or to far open?
Thanks!

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1989 Iroc-Z L98 Original engine-58K miles!!

SLP 1 3/4 SS headers, Hooker Areochamber catback, no cat, BBK AFPR, Hypertech 160* fan switch, ported and gasket matched plenum, TB coolant bypass, relocated MAT sensor, screenless MAF sensor, K&N filters, Accel cap and rotor, Taylor SpiroPro 8mm wires, Bosch Platinum plugs, Mobil 1 Synthetic 15W50 motor oil, and more to come...
Best ET- 14.24@96.76MPH / 2.17 60ft on street tires with the crappy B/W 2.77 gears.

Homepage currently under construction: http://www.iit.edu/~wicktho/len

 

Any help please??

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1989 Iroc-Z L98 Original engine-58K miles!!

SLP 1 3/4 SS headers, Hooker Areochamber catback, no cat, BBK AFPR, 3.8L Turbo V6 200* fan switch, MSD GM coil, ported and gasket matched plenum, TB coolant bypass, relocated MAT sensor, screenless MAF sensor, K&N filters, Accel cap and rotor, Taylor SpiroPro 8mm wires, Bosch Platinum plugs, Mobil 1 oil, and more to come...
Best ET not corrected- 14.24@96.76MPH / 2.17 60ft on street tires with the crappy B/W 2.77 gears.

Homepage currently under construction: http://www.iit.edu/~wicktho/len

 

sounds like with those big gears you have (I have 3.08's myself) your tranny is just downshifting to first when you see the RPMS jump to 950. mine does this too and I think I should get a tranny flush anyway. this problem is very evident on cars with tall rear end gears like stock 80's mustangs. if you listen when one slows down you can actually hear the rpms jump and the tranny downshifts.
if this doesnt seem to add up in your situation then please disregard.
all in all it sounds like every other 3rd gen ive ever driven though so as long as the idle is steady when youre stopped I wouldent worry about it.

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88 WS6 T/A 305 TPI--
K&N,Air foil,hypertech chip, thermostat+fanswitch
free mods, dynomax exh, urethane motor+trans mounts,
SSM frame con, Bilsteins
very trick homemade ramair.

 

88,

Good analysis. My '86 TA does the same thing when downshifting at stop sign approaches. Always has.


If the car idles without hunting while standing still, you're probably O.K. If the idle is hunting while standing, then you might still have a IAC or TPS issue.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

It never did this before I "adjusted" it. I think I made a mistake. Do you think it wants more or less air?

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1989 Iroc-Z L98 Original engine-58K miles!!

SLP 1 3/4 SS headers, Hooker Areochamber catback, no cat, BBK AFPR, 3.8L Turbo V6 200* fan switch, MSD GM coil, ported and gasket matched plenum, TB coolant bypass, relocated MAT sensor, screenless MAF sensor, K&N filters, Accel cap and rotor, Taylor SpiroPro 8mm wires, Bosch Platinum plugs, Mobil 1 oil, and more to come...
Best ET not corrected- 14.24@96.76MPH / 2.17 60ft on street tires with the crappy B/W 2.77 gears.

Homepage currently under construction: http://www.iit.edu/~wicktho/len

 

Drive in first and stop if it dosen't do it then your fine.

 

I'll try that evilho7810 and get back to ya!
Thanks!!