[Gmecm] Tracker TBI Ignition mystery

[Programmer]

Kinda figured it was blue...

Lyndon ; )

----- Original Message ----- 
From: "Cowen" <captain_krill at yahoo.com>
To: <Gmecm at diy-efi.org>
Sent: Tuesday, February 13, 2007 5:24 PM
Subject: [Gmecm] Tracker TBI Ignition mystery


> For anyone still guessing:
>
> I checked the timing of my mother's car yesterday, set
> the same way (by hand, no light, advance until it
> pinged under light throttle, then back it off until it
> stops.)  It matched my wife's car.  BOTH of them are
> reading about 20deg BTDC at idle, check connector
> shorted. (It should be about 8deg)
>
> The check connector does indeed influence timing, so
> that's working.  Also, "blipping" the throttle results
> in a momentary spark retard (as it should when MAP
> increases), followed by spark advance (as it should
> when RPMs increase).
>
> Idle RPM is about 750, factory calls for 800.
>
> Sometime in the future I'll confirm the cam timing,
> and I'll mechanically check that the TDC mark actually
> lines up where it should, although I can't believe
> both cars would've suffered the same failure though
> (and to the same degree).
>
> I give up.  Two different people checking, two
> different guns, two different cars, and ignition seems
> to function flawlessly on both of them - except for
> irrationally high amount of advance!  The car still
> has a very minor driveability issue, so I still think
> there's a problem outside of my technique.
>
> Thanks for all your advice folks, this has changed
> from what I thought was an EFI problem to an unsolved
> mystery.  I appreciate the patience and help from
> those on the list who tune in purely for injection and
> programming discussion.
>
> There used to be (still is?) a radio program on NPR
> called "Click and Clack, the Tappet Brothers" hosted
> by Tom and Ray Mariozzi (sp?).  The premise was that
> people called in to have their car problems diagnosed.
> At about this point in a difficult diagnosis, one of
> the "brothers" would ask the car owner "What colour is
> the car?"  Whatever the response, a learned "Ah ha!"
> (and a flurry of chuckles) would burst forth, as
> though that explained everything!
>
> So, in case you're wondering, it's blue.  They both
> are.
>
> Duncan
>
> **********************END TRANSMISSION**********************
>
>
>
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