Low power 5.0 TPI

[Bruce Plecan]

In the test for too high TPS value.
Depends on cal, but some wherez around 4.7 trips ecm into a default mode and
commanded AFR goes drops to 14.7:1
Bruce



----- Original Message -----
From: "rr" <RRauscher at nni.com>
To: <gmecm at diy-efi.org>
Sent: Monday, October 30, 2000 4:57 PM
Subject: Re: Low power 5.0 TPI


> No, it wasn't a clear flood mode. It was a code condition  whereas
> the code felt something was wrong with the tps. I just looked for what
> I have on it and can't find it.
>
> I also remember Bruce was able to replicate the same thing on his
> test bench. After a certain tps value (high), the ecm would go back
> to closed loop/learn and reduce the bpw.
>
> BobR.
>
>
> Programmer wrote:
>
> > Would you have a section of that code handy ? It's not for
> > "clear flood mode" I hope <g>....
> > Lyndon.
> > -----Original Message-----
> > From: rr <RRauscher at nni.com>
> > To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> > Date: October 27, 2000 1:45 PM
> > Subject: Re: Low power 5.0 TPI
> >
> > >
> > >Actually, the tps reading looks high. There is something about the code
> > when
> > >the tps goes too high, it uses a substitute value and drops out of PE.
A
> > few
> > >years back someone here ran into that with a Vette. Try setting the tps
> > lower.
> > >
> > >The other thing to remember is that a TPI system starts to die about
there.
> > >Something 'bout them long runners.
> > >
> > >BobR.
> > >
> > >Programmer wrote:
> > >
> > >> Hi gurus,
> > >> Got a weird one here I'm trying to help a performance shop on.
Subject
> > >> vehicle is an '88 5.0L TPI with 5 speed and 3.08 ratio--running an
AKFU
> > code
> > >> '165 computer. This code was a one time vehicle Pontiac Firebird--the
> > whole
> > >> thing has been placed in an S10 truck. This thing falls flat after
4500
> > RPM,
> > >> MAF never goes above 175 g/s--pulls timing down to 12 BTDC (with no
> > knock)
> > >> and the shop swears this thing should pull like crazy with the
internal
> > >> engine mods. This thing has the Lingenfelter <sp> intake, TPI
runners,
> > >> etc...Dart heads, 10.5 CR, blah, blah. FP is good, TPS goes 4.7 WOT,
> > however
> > >> this truck is 12 hours away, so I can't personally test....any ideas
?
> > >> Lyndon
> > >>
> > >>
>
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