Dual TBI units - How To Handle Twin IAC's?

[Bruce Plecan]

Two weeks late, but, the CFI TBI's use a very different taper on the IAC,
hence the IAC counts work out fine when using the 747.
Grumpy

----- Original Message -----
From: <ECMnut at aol.com>
To: <gmecm at efi332.eng.ohio-state.edu>
Sent: Friday, December 17, 1999 6:47 PM
Subject: Re: Dual TBI units - How To Handle Twin IAC's?


| Can I change my bet?  I like Shannen's idea better, since he
| has already proven it to work on his own vehicle.
| Thx
| Mike V
| > > 1) Can I physically drive two IAC's from the single PCM IAC driver?
| >  > 2) If so, should I wire the two IAC's in parallel?
| >  > 3) For a first blush at the cal, can I simply cut the commanded IAC
| steps
| > in
| >  > half?  Just looking for a starting point.
| >  > 4) Any other thoughts or recommendations?
| >  Here's some food for thought.  When I converted my CFI to a 7747,  I
| >  connected both IAC's in parallel, just as they were in the old setup.
| >  I've talked to several other people who have done the same.  That ECM
| >  looks for idle speed, not IAC counts, so it just moves the iac until
| >  idle speed is right.
| >  >
| >  > Thanks a bunch;
| >  You betcha.
| >  Shannen
| >  > Walt.
|