problems with GM TBI

[lkurek at smtpgate.anl.gov]

     I second that.
     
     Also, how complete was the swap? For instance, was the EGR, VSS, P/N, 
     switch and Charcoal Cannister hooked up properly? I know that a lot of 
     swappers just ground the P/N switch to fool the ECM into thinking it 
     is always in park or neutral, thereby disabling speed sensitive 
     functions and diagnostics. If they didn't hook all of this up properly 
     and COMPLETELY, you are going to get VERY wacky operation.....at least 
     not what you expect.
     
     Finally, check to see if either the A/C request pin or the power 
     steering switch leads are hooked up properly....or otherwise grounded. 
     In either case, that will raise your idle speed over what is normally 
     commanded.
     
     I've done quite a few swaps like this, and frankly, it may be a little 
     more work up front to get everything operational, but in the long run, 
     it makes things a lot easier. BTW...yes, I would hook up the 
     SES....just get an LED and hook one side of it up to a fused power 
     lead (ign), with a .25A fast blow fuse and tie the other side into the 
     proper pin on the ECM....easy as hell to do, and is very useful (easy 
     for you to do diagnostics as well).
     
     TTYL!
     
     Larry Kurek


______________________________ Reply Separator _________________________________
Subject: Re: problems with GM TBI
Author:  <diy_efi at efi332.eng.ohio-state.edu> at internet
Date:    6/15/98 12:15 PM


Sounds like an Idle Air Control "IAC" solinoid/motor might have gone bad.
     
Jeff Bratcher wrote:
     
> Upon cold start up it would run great until I shut it off. When I
> immediately restart it (ie after going into a store, etc.) I noticed
> that it would stay at high idle and would not come back down to normal 
> idle until the Jeep was shut off and sat long enough for the motor to 
> completely cool off (overnight usually).
> <snip>