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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
[QUOTE=eddie20890]btw joel... the rpms stayed where they were as the number went down. i guess that's another sign IAC is the culprit?[/QUOTE]
Ed Zachary...
With the IAC counts moving up/down by that much, you should see a corresponding drop/rise in the idle speed. The IAC is a "stepper", meaning it moves a step at a time, sorta like a ratchet...click-click-click..
It's possible that while the key was on, the ECM commanded the IAC closed, and the dang thing just got stuck there.
When you change it out, make sure there is not a lot of doo-doo caked up in the passage on the throttle body. Also, check the service manual for info on how to "set" the IAC before installing it, so the pintle isn't sticking out too far. If it is, screwing the IAC in could damage the seat.
Ed Zachary...
With the IAC counts moving up/down by that much, you should see a corresponding drop/rise in the idle speed. The IAC is a "stepper", meaning it moves a step at a time, sorta like a ratchet...click-click-click..
It's possible that while the key was on, the ECM commanded the IAC closed, and the dang thing just got stuck there.
When you change it out, make sure there is not a lot of doo-doo caked up in the passage on the throttle body. Also, check the service manual for info on how to "set" the IAC before installing it, so the pintle isn't sticking out too far. If it is, screwing the IAC in could damage the seat.
Joel Adams
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Send PMLanoka Harbor, NJ - USA
Joined: 12/21/2006
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Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
good news. changed the IAC today and the 90 is up and running again. as soon as i pulled it out you could see it was the culprit as it was extended way to far plus you could see it wasn't seated right by the marks on it.
one thing is for sure, i won't be leaving the key on for any extended period of time anymore.
one thing is for sure, i won't be leaving the key on for any extended period of time anymore.
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Lifetime Member
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Woo-Hoo! Glad to hear it was that simple!!
Joel Adams
C3VR Lifetime Member #56
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(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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in Forum: C4 Engines, Driveline and Handling
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