Holley 4 Brrl gm ecm

[Shannen Durphey]

I saw something similar just last weekend.  Engine ran great carb'ed,
switch to tpi, 1 dead cylinder.  Turns out rockers were too tight, efi
swap was just a coincidence.
Shannen

Shane Buss wrote:
> 
> ive got a serious problem.. 2 dead cylinders.. they have been causing all
> this.. never suspected it because how can your car be running GREAT, you put
> a 4bbl on top, and it never runs right again?
> 
> BUT i compression checked it.. weird huh?
> we'll see
> ----- Original Message -----
> From: "Shannen Durphey" <shannen at grolen.com>
> To: <diy_efi at diy-efi.org>
> Sent: Sunday, May 21, 2000 3:15 PM
> Subject: Re: Holley 4 Brrl gm ecm
> 
> > Do you have a scope or noid light to confirm that the ecm is not
> > triggering the injectors?
> > 27" of vacuum sounds like a pretty strong signal to me. Have you
> > checked it with a guage?  Are you reading the Diacom info correctly?
> > Any chance you're on ported vacuum??  Lots of directions to go, you
> > should have some diagnostic tools to work with.
> > Shannen
> >
> > Shane Buss wrote:
> > >
> > > Here's what i got guys..
> > >
> > > car starts.. idles fine for 5 seconds.. then it revs up a little, then
> quits
> > > spraying and dies..
> > >
> > > The ecm is cutting the fuel out, and my map sensor reads only 27HG.. i
> > > cannot find ANY vacuum leaks, and i dont think i have any.. i tried 2
> map
> > > sensors..
> > >
> > > i think my ecm might be fried, but diacom shows correct readings for
> > > everyone other sensor..  i pulled the vacuum line to the map sensor and
> > > sucked on it as hard as i can, diacom showed 22HG.. sound right?
> > >
> > > THanks,
> > > Shane
> > >
> >
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> 
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