[Diy_efi] RE: Diy_efi Digest, Vol 5, Issue 25

Dennis Hanson dhanson at larsonburton.com
Thu May 29 15:09:15 GMT 2003


OK Guys...  I'm new to this so hang with me a bit.
I have a 1986 325e that has a surge of power when accelerating.  It runs
fine otherwise.
Is this the high pressure fuel pump not keeping up with the demand of fuel?
Or is it the pressure regulator?
Or.... Something else?

 -----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:	Thursday, May 29, 2003 10:35 AM
To:	diy_efi at diy-efi.org
Subject:	Diy_efi Digest, Vol 5, Issue 25

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Today's Topics:

   1. Re: Chevy / Jaguar conversion spark knock (steve ravet)
   2. RE: Chevy / Jaguar conversion spark knock (Mike Worley)
   3. Re: Chevy / Jaguar conversion spark knock (steve ravet)
   4. Re: question for the masses (John Stricker)
   5. Re: question for the masses (steve ravet)
   6. Re: Chevy / Jaguar conversion spark knock (Scott Pearson)
   7. RE: Chevy / Jaguar conversion spark knock (Mike Worley)
   8. RE: Chevy / Jaguar conversion spark knock (Jeff Behrens)
   9. Re: Chevy / Jaguar conversion spark knock (Scott Pearson)


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

Date: Wed, 28 May 2003 14:00:35 -0500
From: steve ravet <sravet at arm.com>
To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <3ED50753.4B398281 at arm.com>
References:
<16C6F45C140EF440AACF65C9C5992A5603A8C2C3 at com2.ambassadorsgroup.com>
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Message: 1

Jack Vines wrote:
> Doubtful any of us will find a "better" location for the knock sensor than
> did GM.  More convenient or more accessible perhaps.  However, it is the
one

The water jacket plug hole predates the knock sensor, there couldn't
have been much of a design decision to place it there.

> component which seldom seems to give trouble or need to be replaced
> periodically.

Agree with that, I only had to replace mine because I crushed it while
installing the engine.  But on a used motor, who knows?

--steve

--
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com

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

Date: Wed, 28 May 2003 15:28:47 -0400
From: "Mike Worley" <Mike.Worley at cae.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Subject: RE: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <9E6F0AEB5128D34BBC1AF4DA50E17E2202B2224A at srv511.caemilusa.com>
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Message: 2

That's a water jacket hole.... (lose coolant when removed)?  I need to
put it somewhere else that I have better access to.

Mike

-----Original Message-----
From: steve ravet [mailto:sravet at arm.com]
Sent: Wednesday, May 28, 2003 3:01 PM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock


Jack Vines wrote:
> Doubtful any of us will find a "better" location for the knock sensor
than
> did GM.  More convenient or more accessible perhaps.  However, it is
the one

The water jacket plug hole predates the knock sensor, there couldn't
have been much of a design decision to place it there.

> component which seldom seems to give trouble or need to be replaced
> periodically.

Agree with that, I only had to replace mine because I crushed it while
installing the engine.  But on a used motor, who knows?

--steve

--
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com

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

Date: Wed, 28 May 2003 14:50:17 -0500
From: steve ravet <sravet at arm.com>
To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <3ED512F9.9BF80CF2 at arm.com>
References: <9E6F0AEB5128D34BBC1AF4DA50E17E2202B2224A at srv511.caemilusa.com>
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Message: 3

Mike Worley wrote:
>
> That's a water jacket hole.... (lose coolant when removed)?  I need to
> put it somewhere else that I have better access to.

Yes, the coolant will come pouring out of the hole.

--steve


--
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com

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

Date: Wed, 28 May 2003 18:49:36 -0500
From: "John Stricker" <jstricke at rwisp.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] question for the masses
Message-ID: <184e01c32573$cf2103e0$0f00a8c0 at johnwo1nvpyipq>
References: <E19Kjg4-0006NR-00 at diy-efi.org>
	<040f01c32523$07a51bd0$0300a8c0 at bear>
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Message: 4

Just curious,

Why not use the MPFI from the Fiero with the Fiero Ignition and '85 ECM that
supports a knock sensor?  It's a common, well hacked ECM (or so I
understand) and pretty low profile.

John Stricker
----- Original Message -----
From: "clayton "oddcomp"" <oddcomp at adelphia.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 28, 2003 9:08 AM
Subject: [Diy_efi] question for the masses


> i am trying to  make a  one off  injection setup for a small kit car
since
> a tbi setup is too tall and using a mpfi setup from the same engine he
would
> have ignition problems
>
> my idea was to  use a carb intake <2.8 litre chevy v6> since they are
fairly
> low profile
> make a plenum to bolt onto it  with a progressive throttle body mounted on
> the front side of the plenum <like a tiny tpi >
> and about 4 injectors 2 on each side firing into the plenum behind the
> throttle body  aside from maybe fuel puddling when its cold or too much
fuel
> from improper tune
> anyone see a problem with this setup?
>
>
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi


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

Date: Wed, 28 May 2003 21:10:03 -0500
From: steve ravet <sravet at arm.com>
To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] question for the masses
Message-ID: <3ED56BFB.21743B8A at arm.com>
References: <E19Kjg4-0006NR-00 at diy-efi.org>
	<184e01c32573$cf2103e0$0f00a8c0 at johnwo1nvpyipq>
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Message: 5

> > my idea was to  use a carb intake <2.8 litre chevy v6> since they are
> fairly
> > low profile
> > make a plenum to bolt onto it  with a progressive throttle body mounted
on
> > the front side of the plenum <like a tiny tpi >
> > and about 4 injectors 2 on each side firing into the plenum behind the
> > throttle body  aside from maybe fuel puddling when its cold or too much
> fuel
> > from improper tune
> > anyone see a problem with this setup?

You've got the wet manifold drawback of TBI with this setup, without the
benefit of the good atomization as the fuel passes the throttle plate.
What is the ignition problem with the MPFI setup?

--steve


--
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com

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

Date: Thu, 29 May 2003 08:34:28 -0500
From: "Scott Pearson" <mrcad472 at iowatelecom.net>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <00e501c325e7$07d3cce0$0475f8d8 at netins.net>
References: <9E6F0AEB5128D34BBC1AF4DA50E17E22037C150C at srv511.caemilusa.com>
Precedence: list
Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Message: 6

When you're changing the base timing, are you also changing it in the EPROM?
I had a 305 powered S10 in the other day that had the base timing set at
"0", set it to the 6 deg advance that was specified and the knock went away.

- Scott
----- Original Message -----
From: "Mike Worley" <Mike.Worley at cae.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 28, 2003 12:27 PM
Subject: [Diy_efi] Chevy / Jaguar conversion spark knock


> I have been struggling with a resolving a spark knock in my now Chevy
> powered Jaguar convertible.  The engine and computer / harness is from a
> 1991 Camaro.  Its a 305 TBI.  Even running at -4deg retard base timing I
> still have spark knock upon even light acceleration (when warm).  The
> sensor doesn't seem to catch it.  There are no error codes showing up
> and I do seem to have some RPM drop when doing the bang on the block
> test.  I wanted to remove the sensor but due to the close quarters I
> cannot seem to break it free.  Its stamped steel construction doesn't
> lend its self to much muscle and every thing seems to slip.  I have do a
> spare and was wondering if there is alternate spot to mount it on the
> Chevy block or intake???  I guess what's more important would be why is
> knocking in the first place...  The engine runs strong, is tight, good
> compression and only 45K miles.   Does anyone have the correct part
> numbers for the sensor and associated signal conditioning amp for the
> 350 TBI engine.  I want to make sure the right parts are installed.
>
> Mike
>   _____
>
> Privileged/Confidential Information may be contained in this message. If
> you are not the addressee indicated in this message (or responsible for
> delivery of the message to such person) you may not use, copy, disclose
> or deliver this message to anyone. If you have received this message in
> error, kindly notify the sender by reply email or at the phone number
> listed above, and then delete this message.
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi




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

Date: Thu, 29 May 2003 10:06:01 -0400
From: "Mike Worley" <Mike.Worley at cae.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Subject: RE: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <9E6F0AEB5128D34BBC1AF4DA50E17E22037C150F at srv511.caemilusa.com>
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Message: 7


Since I didn't have the Camaro under hood decal that specifically sited
the base timing, I was depending on other feedback I got from the Web
that the base timing should be 0 deg, ( set timing connector opened up.)
I have not attempted using any aftermarket chips or reprogramming the
timing maps, etc. First I just need to get it sorted out stock so I know
where I am starting from.

Why would your S10 have reduced knock with base timing advanced more
than spec? Doesn't that skew the entire timing map up causing more
knock? That doesn't sound right.

Does anyone have the definitive answer as to what the base timing should
be for a 1991 Camaro 305 TBI?  Understandably there doesn't seem to be
much interest in the TBI Camaro.

Thanks,
Mike
'67 Jaguar 420 (no EFI here!)
'86 Jaguar XJ6 (Lucas/Bosh EFI)
'88 XJS convertible (Chevy 305 TBI)
'02 Yukon XL



-----Original Message-----
From: Scott Pearson [mailto:mrcad472 at iowatelecom.net]
Sent: Thursday, May 29, 2003 9:34 AM
To: List for general do-it-yourself EFI talk
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock


When you're changing the base timing, are you also changing it in the
EPROM?
I had a 305 powered S10 in the other day that had the base timing set at
"0", set it to the 6 deg advance that was specified and the knock went
away.

- Scott
----- Original Message -----
From: "Mike Worley" <Mike.Worley at cae.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 28, 2003 12:27 PM
Subject: [Diy_efi] Chevy / Jaguar conversion spark knock


> I have been struggling with a resolving a spark knock in my now Chevy
> powered Jaguar convertible.  The engine and computer / harness is from
a
> 1991 Camaro.  Its a 305 TBI.  Even running at -4deg retard base timing
I
> still have spark knock upon even light acceleration (when warm).  The
> sensor doesn't seem to catch it.  There are no error codes showing up
> and I do seem to have some RPM drop when doing the bang on the block
> test.  I wanted to remove the sensor but due to the close quarters I
> cannot seem to break it free.  Its stamped steel construction doesn't
> lend its self to much muscle and every thing seems to slip.  I have do
a
> spare and was wondering if there is alternate spot to mount it on the
> Chevy block or intake???  I guess what's more important would be why
is
> knocking in the first place...  The engine runs strong, is tight, good
> compression and only 45K miles.   Does anyone have the correct part
> numbers for the sensor and associated signal conditioning amp for the
> 350 TBI engine.  I want to make sure the right parts are installed.
>
> Mike
>   _____
>
> Privileged/Confidential Information may be contained in this message.
If
> you are not the addressee indicated in this message (or responsible
for
> delivery of the message to such person) you may not use, copy,
disclose
> or deliver this message to anyone. If you have received this message
in
> error, kindly notify the sender by reply email or at the phone number
> listed above, and then delete this message.
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi




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  _____

Privileged/Confidential Information may be contained in this message. If
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or deliver this message to anyone. If you have received this message in
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------------------------------

Date: Thu, 29 May 2003 07:31:36 -0700 (PDT)
From: Jeff Behrens <jwg94 at yahoo.com>
To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Subject: RE: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <20030529143136.26319.qmail at web11405.mail.yahoo.com>
In-Reply-To: <9E6F0AEB5128D34BBC1AF4DA50E17E22037C150F at srv511.caemilusa.com>
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Message: 8

I owned a 91 gmc truck tbi that called for 0 base
timing.  I ran 8 ahead of base without any problems.
Are you running a knock sensor?  It should take out
any knock problems due to predetonation.  I purposely
set my timing to 18 ahead to test it and it corrected
fine.


Jeff
--- Mike Worley <Mike.Worley at cae.com> wrote:
>
> Since I didn't have the Camaro under hood decal that
> specifically sited
> the base timing, I was depending on other feedback I
> got from the Web
> that the base timing should be 0 deg, ( set timing
> connector opened up.)
> I have not attempted using any aftermarket chips or
> reprogramming the
> timing maps, etc. First I just need to get it sorted
> out stock so I know
> where I am starting from.
>
> Why would your S10 have reduced knock with base
> timing advanced more
> than spec? Doesn't that skew the entire timing map
> up causing more
> knock? That doesn't sound right.
>
> Does anyone have the definitive answer as to what
> the base timing should
> be for a 1991 Camaro 305 TBI?  Understandably there
> doesn't seem to be
> much interest in the TBI Camaro.
>
> Thanks,
> Mike
> '67 Jaguar 420 (no EFI here!)
> '86 Jaguar XJ6 (Lucas/Bosh EFI)
> '88 XJS convertible (Chevy 305 TBI)
> '02 Yukon XL
>
>
>
> -----Original Message-----
> From: Scott Pearson
> [mailto:mrcad472 at iowatelecom.net]
> Sent: Thursday, May 29, 2003 9:34 AM
> To: List for general do-it-yourself EFI talk
> Subject: Re: [Diy_efi] Chevy / Jaguar conversion
> spark knock
>
>
> When you're changing the base timing, are you also
> changing it in the
> EPROM?
> I had a 305 powered S10 in the other day that had
> the base timing set at
> "0", set it to the 6 deg advance that was specified
> and the knock went
> away.
>
> - Scott
> ----- Original Message -----
> From: "Mike Worley" <Mike.Worley at cae.com>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, May 28, 2003 12:27 PM
> Subject: [Diy_efi] Chevy / Jaguar conversion spark
> knock
>
>
> > I have been struggling with a resolving a spark
> knock in my now Chevy
> > powered Jaguar convertible.  The engine and
> computer / harness is from
> a
> > 1991 Camaro.  Its a 305 TBI.  Even running at
> -4deg retard base timing
> I
> > still have spark knock upon even light
> acceleration (when warm).  The
> > sensor doesn't seem to catch it.  There are no
> error codes showing up
> > and I do seem to have some RPM drop when doing the
> bang on the block
> > test.  I wanted to remove the sensor but due to
> the close quarters I
> > cannot seem to break it free.  Its stamped steel
> construction doesn't
> > lend its self to much muscle and every thing seems
> to slip.  I have do
> a
> > spare and was wondering if there is alternate spot
> to mount it on the
> > Chevy block or intake???  I guess what's more
> important would be why
> is
> > knocking in the first place...  The engine runs
> strong, is tight, good
> > compression and only 45K miles.   Does anyone have
> the correct part
> > numbers for the sensor and associated signal
> conditioning amp for the
> > 350 TBI engine.  I want to make sure the right
> parts are installed.
> >
> > Mike
> >   _____
> >
> > Privileged/Confidential Information may be
> contained in this message.
> If
> > you are not the addressee indicated in this
> message (or responsible
> for
> > delivery of the message to such person) you may
> not use, copy,
> disclose
> > or deliver this message to anyone. If you have
> received this message
> in
> > error, kindly notify the sender by reply email or
> at the phone number
> > listed above, and then delete this message.
> >
> > _______________________________________________
> > Diy_efi mailing list
> > Diy_efi at diy-efi.org
> > http://www.diy-efi.org/mailman/listinfo/diy_efi
>
>
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi
>   _____
>
> Privileged/Confidential Information may be contained
> in this message. If
> you are not the addressee indicated in this message
> (or responsible for
> delivery of the message to such person) you may not
> use, copy, disclose
> or deliver this message to anyone. If you have
> received this message in
> error, kindly notify the sender by reply email or at
> the phone number
> listed above, and then delete this message.
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi


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

Date: Thu, 29 May 2003 09:44:32 -0500
From: "Scott Pearson" <mrcad472 at iowatelecom.net>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock
Message-ID: <017001c325f0$d4424f00$0475f8d8 at netins.net>
References: <9E6F0AEB5128D34BBC1AF4DA50E17E22037C150F at srv511.caemilusa.com>
Precedence: list
Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
Message: 9

6 deg is what the base timing was set at in the chip. Find out what your
base timing should be and set it there, might take care of your problem.

If you want, send me your file offlist and I'll look it up and see what it
should be.

- Scott
----- Original Message -----
From: "Mike Worley" <Mike.Worley at cae.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Thursday, May 29, 2003 9:06 AM
Subject: RE: [Diy_efi] Chevy / Jaguar conversion spark knock


>
> Since I didn't have the Camaro under hood decal that specifically sited
> the base timing, I was depending on other feedback I got from the Web
> that the base timing should be 0 deg, ( set timing connector opened up.)
> I have not attempted using any aftermarket chips or reprogramming the
> timing maps, etc. First I just need to get it sorted out stock so I know
> where I am starting from.
>
> Why would your S10 have reduced knock with base timing advanced more
> than spec? Doesn't that skew the entire timing map up causing more
> knock? That doesn't sound right.
>
> Does anyone have the definitive answer as to what the base timing should
> be for a 1991 Camaro 305 TBI?  Understandably there doesn't seem to be
> much interest in the TBI Camaro.
>
> Thanks,
> Mike
> '67 Jaguar 420 (no EFI here!)
> '86 Jaguar XJ6 (Lucas/Bosh EFI)
> '88 XJS convertible (Chevy 305 TBI)
> '02 Yukon XL
>
>
>
> -----Original Message-----
> From: Scott Pearson [mailto:mrcad472 at iowatelecom.net]
> Sent: Thursday, May 29, 2003 9:34 AM
> To: List for general do-it-yourself EFI talk
> Subject: Re: [Diy_efi] Chevy / Jaguar conversion spark knock
>
>
> When you're changing the base timing, are you also changing it in the
> EPROM?
> I had a 305 powered S10 in the other day that had the base timing set at
> "0", set it to the 6 deg advance that was specified and the knock went
> away.
>
> - Scott
> ----- Original Message -----
> From: "Mike Worley" <Mike.Worley at cae.com>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, May 28, 2003 12:27 PM
> Subject: [Diy_efi] Chevy / Jaguar conversion spark knock
>
>
> > I have been struggling with a resolving a spark knock in my now Chevy
> > powered Jaguar convertible.  The engine and computer / harness is from
> a
> > 1991 Camaro.  Its a 305 TBI.  Even running at -4deg retard base timing
> I
> > still have spark knock upon even light acceleration (when warm).  The
> > sensor doesn't seem to catch it.  There are no error codes showing up
> > and I do seem to have some RPM drop when doing the bang on the block
> > test.  I wanted to remove the sensor but due to the close quarters I
> > cannot seem to break it free.  Its stamped steel construction doesn't
> > lend its self to much muscle and every thing seems to slip.  I have do
> a
> > spare and was wondering if there is alternate spot to mount it on the
> > Chevy block or intake???  I guess what's more important would be why
> is
> > knocking in the first place...  The engine runs strong, is tight, good
> > compression and only 45K miles.   Does anyone have the correct part
> > numbers for the sensor and associated signal conditioning amp for the
> > 350 TBI engine.  I want to make sure the right parts are installed.
> >
> > Mike
> >   _____
> >
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End of Diy_efi Digest, Vol 5, Issue 25
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