Start up rev
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Joined: Sep 2000
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From: Sarasota, FL
Start up rev
When I start the motor hot, it'll rev up to 2000 and sit there for a couple of seconds. I thought this was the IAC park steps, but adjusting it didn't help. A cold start works fine. Any ideas?
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Joined: Jun 2000
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Aaron's 87:
When I start the motor hot, it'll rev up to 2000 and sit there for a couple of seconds. I thought this was the IAC park steps, but adjusting it didn't help. A cold start works fine. Any ideas?</font>
When I start the motor hot, it'll rev up to 2000 and sit there for a couple of seconds. I thought this was the IAC park steps, but adjusting it didn't help. A cold start works fine. Any ideas?</font>
Supreme Member
Joined: Jun 2000
Posts: 7,554
Likes: 1
From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Aaron's 87:
Went through all that when I tore everything apart. Are the park steps how far the IAC is open when your start the car? </font>
Went through all that when I tore everything apart. Are the park steps how far the IAC is open when your start the car? </font>
But why would it all of a sudden change?.
Still sounds like an IAC related problem.
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Joined: Oct 2000
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From: Lima, Ohio
Could you give some more info on the cars specs? What code your running as your base chip?
I had a similar problem when I was running the AUJP base code on my 5speed car. I also had some other minor open loop problems along with other minute driveability problems. I've since then switched over to the 92 305/5spd chip and copied all of my exsisting tables over from the AUJP chip, it runs much better and also starts great.
On hot starts now it will jump to 1500rpms max, if that. One big thing I noticed between the two is the fact that the manual chip parks the IAC at 120 instead of the 160 for the auto tranny. You could try and fudge with that a little to see how it works but I have a feeling its a little more complicated than that.
Like Bruce said, it could just be a dirty IAC passage.
Brendan
------------------
1987 IROC-Z L98,SR,EB 6085's,LPE 219/219 SR Cam, Crane 1.6RR, EB TPI Base, 58mm TB, Stock T5, 30lb SVO, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, Aluminum DS, 94 Disk Rear, Adjustable Prop Valve, Precision 3.73 Gears, Weld in Sub-Frame Connectors, Hotchkis LCA's, KYB Shocks/Struts, Poly Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm, Big stereo, 730SD Conversion.
To see the ROC, Check out the webpage Here
I had a similar problem when I was running the AUJP base code on my 5speed car. I also had some other minor open loop problems along with other minute driveability problems. I've since then switched over to the 92 305/5spd chip and copied all of my exsisting tables over from the AUJP chip, it runs much better and also starts great.
On hot starts now it will jump to 1500rpms max, if that. One big thing I noticed between the two is the fact that the manual chip parks the IAC at 120 instead of the 160 for the auto tranny. You could try and fudge with that a little to see how it works but I have a feeling its a little more complicated than that.
Like Bruce said, it could just be a dirty IAC passage.
Brendan
------------------
1987 IROC-Z L98,SR,EB 6085's,LPE 219/219 SR Cam, Crane 1.6RR, EB TPI Base, 58mm TB, Stock T5, 30lb SVO, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, Aluminum DS, 94 Disk Rear, Adjustable Prop Valve, Precision 3.73 Gears, Weld in Sub-Frame Connectors, Hotchkis LCA's, KYB Shocks/Struts, Poly Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm, Big stereo, 730SD Conversion.
To see the ROC, Check out the webpage Here
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Joined: Sep 2000
Posts: 235
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From: Sarasota, FL
I've got a new IAC in it, but it might be sticking or something. I've got my park steps at 0 and this only happens sometimes. The car used to do it when stock once in a while though, so I figured it might be hidden in the code somewhere.
Car is 87 Auto Vette with ARAP as a base but lots of spark and fuel changes for the heads and cam.
Car is 87 Auto Vette with ARAP as a base but lots of spark and fuel changes for the heads and cam.
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