[Diy_efi] RE: diy_efi Digest, Vol 6, Issue 15

Sat Apr 24 17:45:23 GMT 2004

Hi Guys:

I am new.  And very inexperienced.  However, I am a quick study mechanically
and electrically.  Anyone who is extremely familiar with the Chevy 5.7 TBI
and its computer/harness/sensors, please shout back.  I would very much like
to tap into some good technical expertise and identify where information can
be found for the proper operation, repair, overhaul and maintenance of such
a system.

Thanks,
Christian Colletti
cacolletti at att.net
757-582-3083

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of diy_efi-request at diy-efi.org
Sent: Tuesday, March 23, 2004 1:00 PM
To: diy_efi at diy-efi.org
Subject: diy_efi Digest, Vol 6, Issue 15

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Today's Topics:

   1. Re: 1227747 VSS signal?? (Ludis Langens)
   2. Re: 1227747 VSS signal?? (frederic)
   3. Intake pop at start-up (Rod Hiorns)
   4. Re: Intake pop at start-up (Adam Wade)
   5. New Guy (Manson, Tom)

----------------------------------------------------------------------

Message: 1
Date: Mon, 22 Mar 2004 13:36:41 -0800
From: Ludis Langens <ludis at cruzers.com>
Subject: Re: [Diy_efi] 1227747 VSS signal??
To: A list for Do-It-Yourself EFI <diy_efi at diy-efi.org>
Message-ID: <405F5C66.C6FB69FA at cruzers.com>
Content-Type: text/plain; charset=us-ascii

frederic wrote:
>
> > I am installing a TBI system out of a 88 chev 1/2 ton into a 75 Nova.  I
have a 4000 pulse/mile speed pulse generator installed on the speedo cable.
How do I get this thing to work with my computer?  I think the instrument
cluster "cleaned up" the signal in the truck?  Will it work to just hook up
the speed sensor wires directly to the ECM?  Any help would be greatly
appricated...
>
> I wasn't able to get my 4k per mile speed sensor to talk directly to the
> 749 ECM for whatever reason, so I put a simple op-amp between the two
> wired up for zero gain (using two 5.6K resistors).  Worked fine.  You
> might have to do the same.

The 747 for his TBI wants a 2000 ppm "optical" signal.  Electrically,
the ECM is expecting a "switch" to ground that opens and closes.  The
donor vehicle should have had a box that did the needed conversion.  It
might have labeled as a "4 OUT BUFFER".  BTW, the "box" does the 4000 to
2000 conversion too.

Your 749 can use two different types of VSS signal depending on a mode
bit in the EPROM.  One setting will accept the same signal as the 747.
The opposite setting wants a 4000 ppm "magnetic" signal to be applied
across a pair of ECM pins.  The "magnetic" signal can be created via a
DC motor run backwards (aka generator) or a reluctor setup.

--
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

------------------------------

Message: 2
Date: Mon, 22 Mar 2004 16:50:32 -0500 (EST)
From: frederic <frederic at midimonkey.dyndns.org>
Subject: Re: [Diy_efi] 1227747 VSS signal??
To: ludis at cruzers.com, A list for Do-It-Yourself EFI
	<diy_efi at diy-efi.org>
Message-ID:
	<Pine.LNX.4.44.0403221650160.3369-100000 at midimonkey.dyndns.org>
Content-Type: TEXT/PLAIN; charset=US-ASCII

> Your 749 can use two different types of VSS signal depending on a mode
> bit in the EPROM.  One setting will accept the same signal as the 747.

Thank you very much Ludis!

------------------------------

Message: 3
Date: Mon, 22 Mar 2004 15:16:40 -0800 (PST)
From: Rod Hiorns <rehiorns at vcn.bc.ca>
Subject: [Diy_efi] Intake pop at start-up
To: diy_efi at diy-efi.org
Message-ID: <Pine.GSO.4.43.0403221511410.13842-100000 at earth>
Content-Type: TEXT/PLAIN; charset=US-ASCII

Hi,
I've now got an intake "pop" at key-on (inline 4 cyl with plenum)
and I guess this is a leaky injector (since I've just installed
some). They are new, so I wasn't expecting problems ... are there
any other likely causes of this? It seems to be worst after it's
been standing for a while, and the pop is *before* the priming is
complete or cranking has begun.
Thanks for your insight,
Rod

------------------------------

Message: 4
Date: Mon, 22 Mar 2004 15:44:30 -0800 (PST)
From: Adam Wade <espresso_doppio at yahoo.com>
Subject: Re: [Diy_efi] Intake pop at start-up
To: A list for Do-It-Yourself EFI <diy_efi at diy-efi.org>
Message-ID: <20040322234430.84737.qmail at web41608.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii

--- Rod Hiorns <rehiorns at vcn.bc.ca> wrote:

> I've now got an intake "pop" at key-on (inline 4 cyl
> with plenum) and I guess this is a leaky injector
> (since I've just installed some).

Another potential option is that it's the fuel
pressure regulator.  Why did you replace the old injectors?

__________________________________
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Yahoo! Finance Tax Center - File online. File on time.
http://taxes.yahoo.com/filing.html

------------------------------

Message: 5
Date: Tue, 23 Mar 2004 09:52:46 -0600
From: "Manson, Tom" <Tom.Manson at danahermotion.com>
Subject: [Diy_efi] New Guy
To: <diy_efi at diy-efi.org>
Message-ID: <E7C7B94803F502498784EC26674E245501705BA2 at exchange2000>
Content-Type: text/plain; charset="iso-8859-1"

Hi, I'm new to this list. I own three late model Chrysler products that all
have OBDII and I want to be able to troubleshoot these babies to the Nth
degree. My daughter is starting college this year, that means I will not be
buying any new cars soon! I have an Actron scan tool, but all it does is
give the error codes and allows you to clear them. Like it's one step better
than a blinking MIL. So I need something where I can hook up and get good
stuff like sensor output voltages, be able to control actuators, etc. I've
seen software/cables for laptops and PDA's. Actron has a model CP9145 that
supposedly gives you that capability. I build computerized electronic test
and control systems for a living, so this stuff is right up my alley. Any
opinions out there? What are my options?

Thanks, Tom Manson
Rockford, IL
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