[ba] LT1 Runs Finally - No more DTC 46

Wm. Perry Kincy, CLU, ChFC kincy at kincy.com
Mon Apr 27 04:23:24 GMT 1998


Name the weekend for the Body Installapalooza as soon as possible so schedules can
be reworked.

Perry

Joe Gervais wrote:

> Thanks to the help on these two lists, I got the 93 LT1 motor in my 61 Vette
> running today. The prom images with no vats apparently didn't have VATS
> disabled properly, because the injectors didn't stay running.
>
> Knowing that the Fbody has an easily defeatable VATS, I got the proper input
> for the ECM from Scot on the DIY_EFI list, and built a $5 timer circuit using a
> 555 IC to bypass the thing. I should have done this a couple of months ago, but
> oh well.
>
> Now the race is on. There's the GG Summer Get Together in 4 weeks. I may need a
> body dropapaloosa at my house in a couple of weeks to make the show. The car
> will certainly be on the road by July.
>
> I taped the motor, so I'll have an audio file up on reality in a day or two.
>  I'll have to see how it is with tailpipes, but right now, the bare chassis
> with the straight 2.5" exhaust and 3 chamber Flowmasters is bordering on too
> loud, although it is a good tone. Given I didn't roll the chassis into the
> driveway, and had the sound bouncing off the back wall of the garage didn't
> help. My kids came running from the park a good 1/8 mile away, so it's got
> audible punch.
>
> VATS bypass details
>
> For 93 FBody, ECM 16159278, terminal A19 on the ECM needs a 30 Hz signal, 50%
> duty cycle.
>
> For 94 and possibly 95 with PCM 16188051 terminal A25 on the PCM needs a 50 Hz
> signal.
>
> Alan wrote "In my 94 Helms, it sez terminal A25 on PCM. The name of the wire
> going to this terminal is 229 DK BLU - it may be on your harness. If 40-60Hz is
> not present on this terminal, engine will stall after 1.7 seconds.", which is
> exactly what was happening on my motor.
>
> --
> _________________________________________________________________________
> Joe Gervais                   gervais at sgi.com
> Product Manager               (650) 933-7479 voice
> High Performance Networking   (650) 964-0811 fax
> Silicon Graphics              www.sgi.com
>
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