idles high after warms up
04-13-2011, 04:45 PM
#1
Thread Starter
Join Date: May 2010
Location: ohio
Posts: 14
idles high after warms up
i have a 92 lx vert some mods, headers, underdrive pulleys full flowmaster exhaust, 3.73 gear and cold air induction kit. car runs good untill it warms up then it starts idleing high and wont idle down. i was thinking it might be the idle air control i was told i might just be able to clean it but i dont know any help would be appriciated thanks.
04-16-2011, 10:59 AM
#4
4th Gear Member
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 1,219
Got this one thanks to Joel.5.0...
Summarized/Corrected Base Idle Reset version
1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned.
2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid.
3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own.
4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected.
5. Set idle speed to the lowest setting possible between 600-800 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows.
6. Turn engine off, and reconnect IAC
7. With Ign On Eng Off, check TPS voltage output....if it's between .7vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire.
8. Disconnect battery (-) for 3-5 minutes.
9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup,
10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time.
11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required.
12. Reconfirm TPS output is within the .7vdc - 1.0vdc range.......you're done!...
..no need to reset ECM KAM (reset computer) b/c the TPS minimum value used for idle control, is automatically reset by the EEC-IV every time the ign is cycled on-off for 20 seconds-on, and as explained in the next post
13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....now you're done.
Summarized/Corrected Base Idle Reset version
1. Clean TB with carb cleaner and nylon brush (toothbrush size). Engine off, fully open TB blade and spray/brush TB until all gunk and oil residue is cleaned.
2. Allow to dry, or close TB blade and start engine until it clears all carb cleaner fumes/liquid.
3. Let engine idle...if it doesn't, increase idle speed via TB stop screw until engine stays idling on its own.
4. Disconnect IAC valve, if engine dies repeat 3 with IAC disconnected.
5. Set idle speed to the lowest setting possible between 600-800 rpms with IAC disconnected. It is key to use the lowest possible to prevent idle surge, rolling, etc once the IAC is connected as follows.
6. Turn engine off, and reconnect IAC
7. With Ign On Eng Off, check TPS voltage output....if it's between .7vdc - 1.0vdc, it's OK. This voltage check should be done between the Green and Black wires at the TPS side connector as shown in the pic below....(-) terminal of the DVOM on the Black wire and (+) terminal on the Green wire.
8. Disconnect battery (-) for 3-5 minutes.
9. Reconnect battery, start engine, allow it to idle for 2-4 minutes to confirm setup,
10. If idle speed falls too low or stalls, increase idle speed via the TB set screw a little at a time.
11. Turn engine off for 20 seconds, re-start engine and repeat 9 - 11 if required.
12. Reconfirm TPS output is within the .7vdc - 1.0vdc range.......you're done!...
..no need to reset ECM KAM (reset computer) b/c the TPS minimum value used for idle control, is automatically reset by the EEC-IV every time the ign is cycled on-off for 20 seconds-on, and as explained in the next post
13. Allow a 10-20 minute "relearning" period under normal driving conditions (drive cycle).....now you're done.
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