[Diy_efi] High idle after highway driving

[Aaron]

If it worked before and is only messing up recently, then a sticking IAC is
a good possibility, like Mike says.
A plugged passage is also a place to look.

Do you see the high count position during your in town driving?
Since the GM TBI IAC is a stepper motor basically, it may have a bad
position.

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Mike
Sent: Wednesday, January 26, 2011 3:58 AM
To: Ashley Wagner; Do It Yourself fuel injection
Subject: Re: [Diy_efi] High idle after highway driving

By IAC I guess u mean Idle Air Adjust,

Can you tell if the unit is jamming due to high changes or anything else,
perhaps less vibration at highway, round town its shaking more as engine
revs up and down... Is the pwm signal to it different, does the O2 feedback
loop stay on when idle on TPS, tried tapping the IAC to see if it shifts up
or down
esp after highway cycle etc etc,
regards
mike

At 02:47 AM 1/26/2011, Ashley Wagner wrote:
>My 7747 does not want to idle down below 1000 rpm after I have taken  
>it out on the Highway. The IAC stays out at a high count and does not  
>readjust. It does not do this when I drive it around town, any  
>suggestions???
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://lists.diy-efi.org/mailman/listinfo/diy_efi

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://lists.diy-efi.org/mailman/listinfo/diy_efi