Timing...

[Bruce Plecan]

-----Original Message-----
From: David A. Cooley <n5xmt at bellsouth.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Saturday, November 14, 1998 5:25 PM
Subject: Timing...


>While disassembling and playing with the code and going through the tables
>for my 1995 Buick LeSabre, I found a strange calibration... The front 3
>cylinders (transverse mounted 3800 V6) have the ignition timing retarded in
>relation to the rear 3 cylinders...  Cyl's 6 & 4 are retarded 3.86 Degrees,
>Cyl 2 is retarded 1.58 Degrees.
>Anyone know why? (or why I shouldn't change them to 0?)

Just quessing but some ideas are
The O2 when mounted behind the radiator in cool weather tends
   to cool too much might be a strat to keep it warmer.
Is most the EGR porting (or exhaust port pick-up) around there.
Wouldn't be surprised to hear it's engine balance related.
What kind of timing does it run at light cruise/WOT?.

You might try splitting the difference, and see what goes.  But, unless
there is a noticeable improvement, I'd leave it there.
Cheers
Bruce
This "retard" is always present?.

>Thanks,
>Dave
>
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>           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
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approximated.
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