Scanner problems

[Jason Weir]

T Hergen wrote:

> My '92 4.3L vin W (as opposed to vin Z, the one without the balance
> shaft)
> has two knock sensors wired in parallel.  There are different flavors
> of
> the 4.3L vin W that require different calibrations.  One service note
> states explicity (quoting from bulletin no. 23-61-11, referring to the
>
> flavors of vin W 4.3L motors)  "Without the correct calibration
> MEM-CAL,
> the engine will detonate."  Of the two vin W 4.3L motors I know about,
> one
> has needle bearing (early motors) and the other has sleeve bearings.
> The
> needle bearings are more noisy resulting in the need for different
> knock
> calibrations, I think.
>
> The knock sensor locations for the vin W for more recent motors have
> changed as compared to my '92 motor.  This will probably affect the
> knock
> sensitivity (and required "calibration").
>
> This info doesn't fix your problem, but it may help you figure out
> what
> to look at.
>
> Tom

I have a 91 system and the scanner doesnt like W for an engine code in
91 so hopefully that elliminates that possability but I'll check it out
anyways... thanks Jason

--
Jason Weir - 88 YJ - 258 / Howell TBI  145K and counting
Fayetteville, North Carolina
JTW Web pages at http://home.att.net/~jweir
mailto:jweir at worldnet.att.net