Diagnosis steps & tools?

[rauscher at icst.com]

For those DIY's, there's also a write-up & schematic for a stepper
motor driver in the incoming directory:

ftp://efi332.eng.ohio-state.edu/incoming/

StepDrv1.gif
StepDrv2.gif
Stepdrv.txt

This circuit is aimed at the GM IAC's...

BobR.


Bruce wrote:
>On the gms, the pintle shaft rides on a little plastic insert to keep it
>from spinning rather than unscrewing.   It's real easy to FUBAR that
>little plastic insert (been there, and have many T-Shirts to show for it)
>
>If you really have a need to play with it, get a Stepper Motor Controller
>Kit, and slow it down, and use that to install, and remove the pintle.
>
>Usually a quick zap of carb cleaner is fine.  If there is so much carbon in
>there that that isn't enough get a new/replacement IAC.

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