[Syty] Broke & Stumped!

[Frank]

May be the chip itself.  I had similar problems with a 10:1 chip many years
ago.

Frank Plutt
Cleveland, OH
'91 sy 1404
'92 ty 1737
   
>  DOlivares <seravilo at netzero.net> wrote:  > Who watches The
Watcher? 
 >  
 > Who advises The Guru?
 >  
 > Who assists The Good Samaritan?
 >  
 > I think we're about to find out pretty soon-- at least
> until I can get my Lapdog running again (and one of
> :
 >  
 > Meanwhile, I NEED HELP!  With my laptop in pieces
> all over the bench, I can't run DIACOM or DATALINK
> to give me clues about the usual suspects:
 >  
 > Clean-livin' doesn't always pay off if my holidaze
> so far are any indication.  I spent Christmas Eve
> on a carlift taking apart my right-front axle-- again!--
> after being assured by our local "Gear-Guru" (who
> fully rebuilt that differential less than 6 months
> before I started hearing that same CLUNKING on left
> turns again) that all I needed was a new cir-clip
> (GM #14041989) to keep the axle from popping-out of
> the side-gear in the differential.  HAH!  More bad
> advice and I ended up taking a cab home....  More
> about that Horror Show in a later mailing.
 >  
 > Meanwhile, we got our first technical freeze down
> here in what was becoming tropical San Antone on Nov. 17th and our
first hard-freeze,
> appropriately, on Dec. 7th, and somewhere in between
> those times ol' Syclone #773 began throwing fits during start-up and
for the first 5
> or 6 minutes until the water jacket hits and stays
> at 180° or so.  I'm stumped for the first time in a decade
> or more!  Here's what happens:
 >  
 > Since the new Walbro fuel-pump went in a few months ago, cranking
> times are way down... engine catches pretty quick,
> but now it won't stay lit and "choke" with the new IAC, which went in
along with a new TPS and remote-adjustable FPR about a month before
> the new Walbro.  Now, I have to feather the pedal
> once the ignition gets going and hold the throttle
> open a bit while the IAC hunts for about a dozen cycles
> making the tach swing about 1200 rpm back and forth
> until we hit the "sweet spot" and the engine takes
> off smoothly and the IAC-hunting stops, at least for
> a while.  Now, it's safe to put her in gear and drive
> away as long as I keep a little positive bias in the
> pedal for the next few minutes every time I have to
> slow down to an idle or coast speed. 
 >  
 > THIS PROBLEM IS WICKEDLY WORSE ON COLD DAYS, where
> ambient air is in the 40s or below, which thankfully
> is rare.  (Ain't this global-warming great!)  However,
> on a couple of occasions when I did have to drive
> in the 30s-- and even after reaching full-warm-up temperature-- the
engine starts
> cutting out seriously as the SES light comes on! 
> Now, we're talking some MAJOR pumping of the pedal
> to keep things lit and if I can get on a clear piece
> of road and cruise a spell at 35 mph or better the
> problem goes away completely, until I shutdown and the engine gets cold
again. 
> I barely even recognize that SES light... hardly ever
> see it.  Driving on warmer days never sees a recurrence
> of that mid-period cutting-out, and idle is smooth
> as is the rest of drivability.  Warm start-ups see
> a few moments of that IAC-hunting, but the rpm-sweeps
> are only on the order of 500rpm and the whole anomaly
> goes away in about 30 seconds.  I've NEVER encountered
> anything like this in my many years of wrenching! 
> Now, it's time for some wretching!!  All that ever
> gets logged in the way of a trouble-code is 44... not too helpful!
 >  
 > Naturally, I replaced the O2 sensor-- no improvement
> at all!  Everything described above instinctually
> told me this was a weird thermal transient in the
> injector-drive circuits or else the MAT, CTS or MAP
> I replaced (for the hell of it) 3 years ago needed
> to be switched again.  So I did... one at a time to see if I could
fault-locate the
> culprit that way.  No dice!  I'm running out of hardware
> to replace!  I've even tried setting that 10-to-1
> Chip to different settings, but the same nasty behavior
> persists-- the engine's as well as my own!
 >  
 > WHO CAN TELL ME WHAT MY PROBLEM(S) IS?  Be nice, now....
 >  
 > Dennis O.
 >