[Diy_efi] Re: (was: IAC counts) VE tuning issues
Karl Walter
krw at efn.org
Sat Jan 1 23:52:15 GMT 2005
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I have had trouble with the AIR system bleeding air into the exhaust =
even with the valve "off". Had to plug off the air line whlie tuning. =
Once I had the idle set, and re-connected everything, it would creep to =
ritch. Had to replace the valve in the end. Also had problems with =
the exhaust manifold not sealing at the head on another vehicle and =
giving lean readings on the o2 sensor. Idle blocks are hard to tune, in =
my opinion, since they have to be lean to pass smog.
--Karl=20
----- Original Message -----=20
From: Mike Frels=20
To: A list for Do-It-Yourself EFI=20
Sent: Saturday, January 01, 2005 5:42 AM
Subject: Re: [Diy_efi] Re: (was: IAC counts) VE tuning issues
I was reading HELMS this morning(couldn't keep the eyelids open past =
11:00 last night) AIR should only inject into the exhaust manifolds when =
cold and in open loop to help burn converter destroying unburned fuel. =
When it warms and goes closed the AIR should then divert to the =
converter. I interpret this to mean the AIR system should have no =
influence on my 02 readings.
Just the same I am going to double check for proper operation today. =
Hmmm...could I have switched the two connectors to the diverter valve =
last time I reassembled after checking lifter preload?...I've done worse =
before!...
I will report on progress as it happens. Yesterday's forecast for =
today was 50% chance of rain.
Happy New Year,
Mike
At 10:04 PM 12/31/2004, you wrote:
that may be the problem... while tuning, plug the AIR system as it =
injects air to the exhaust like a giant leak...
=20
=20
-------Original Message-------
=20
From: Mike Frels
Date: 12/31/04 21:54:09
To: A list for Do-It-Yourself EFI
Subject: Re: [Diy_efi] Re: (was: IAC counts) VE tuning issues
=20
Don't you mean 'injectors are much SMALLER than #24 they are =
supposed to be?'
=20
Anyway as far as oxygen getting into the exhaust stream the only =
thing I
have really checked is proper AIR system operation. That is working =
as it
should. I have not re-checked that exhaust manifold bolts since =
spring when
I put the engine in. Yes, I am still running cast iron manifolds. I =
will
take a wrench to the exhaust bolts and nuts tomorrow. Thanks for =
that
possible pointer.
=20
The injectors are brand new Accel 24 pounders. No, I did not have =
them
flowed before installing as I believed I could trust them from the =
factory.
Is experience counter to this?
=20
Mike
=20
At 05:59 PM 12/31/2004, you wrote:
>I look at it this way: BLM's greater than 128 means the ECM is =
having to
>add fuel to keep the mixture right. This means it's getting more =
air than
>it should according to the VE tables, which means the table values =
need to
>be raised by the appropriate factor. [(BLM/128)*current VE] is a =
very
>good formula for finding how much to adjust it.
>
>If you're getting 160 BLM's and you have 80's in the low-rpm VE =
table,
>then either your injectors are much bigger than the 24# that you =
think
>they are, or you have a pretty significant vacuum leak, or you're =
getting
>a false lean reading from the O2. First thing to do is check for =
exhaust
>leaks before/near the O2, as that will REALLY screw with your BLMs. =
Where
>did you get the injectors? Are they new or used, and have they =
been flow
>tested?
-------------------------------------------------------------------------=
-----
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<DIV><FONT face=3DArial size=3D2>I have had trouble with the AIR system =
bleeding air=20
into the exhaust even with the valve "off". Had to plug off the air line =
whlie=20
tuning. Once I had the idle set, and re-connected everything, =
it=20
would creep to ritch. Had to replace the valve in the=20
end. Also had problems with the exhaust manifold not =
sealing at=20
the head on another vehicle and giving lean readings on the o2 =
sensor. =20
Idle blocks are hard to tune, in my opinion, since they have to be lean =
to pass=20
smog.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>--Karl</FONT> </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dmfrels at ix.netcom.com =
href=3D"mailto:mfrels at ix.netcom.com">Mike=20
Frels</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
href=3D"mailto:diy_efi at diy-efi.org">A list for Do-It-Yourself EFI</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, January 01, =
2005 5:42=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Diy_efi] Re: =
(was: IAC=20
counts) VE tuning issues</DIV>
<DIV><BR></DIV>I was reading HELMS this morning(couldn't keep the =
eyelids open=20
past 11:00 last night) AIR should only inject into the exhaust =
manifolds when=20
cold and in open loop to help burn converter destroying unburned fuel. =
When it=20
warms and goes closed the AIR should then divert to the converter. I =
interpret=20
this to mean the AIR system should have no influence on my 02=20
readings.<BR><BR>Just the same I am going to double check for proper =
operation=20
today. Hmmm...could I have switched the two connectors to the diverter =
valve=20
last time I reassembled after checking lifter preload?...I've done =
worse=20
before!...<BR><BR>I will report on progress as it happens. Yesterday's =
forecast for today was 50% chance of rain.<BR><BR>Happy New=20
Year,<BR>Mike<BR><BR>At 10:04 PM 12/31/2004, you wrote:<BR>
<BLOCKQUOTE class=3Dcite cite=3D"" type=3D"cite">that may be the =
problem... while=20
tuning, plug the AIR system as it injects air to the exhaust like a =
giant=20
leak...<BR> <BR> <BR><I>-------Original=20
Message-------<BR></I> <BR><B><I>From:</I></B> <A=20
href=3D"mailto:mfrels at ix.netcom.com">Mike =
Frels</A><BR><B><I>Date:</I></B>=20
12/31/04 21:54:09<BR><B><I>To:</I></B> <A=20
href=3D"mailto:diy_efi at diy-efi.org">A list for Do-It-Yourself=20
EFI</A><BR><B><I>Subject:</I></B> Re: [Diy_efi] Re: (was: IAC =
counts) VE=20
tuning issues<BR> <BR>Don't you mean 'injectors are much =
SMALLER than=20
#24 they are supposed to be?'<BR> <BR>Anyway as far as oxygen =
getting=20
into the exhaust stream the only thing I<BR>have really checked is =
proper=20
AIR system operation. That is working as it<BR>should. I have not =
re-checked=20
that exhaust manifold bolts since spring when<BR>I put the engine =
in. Yes, I=20
am still running cast iron manifolds. I will<BR>take a wrench to the =
exhaust=20
bolts and nuts tomorrow. Thanks for that<BR>possible=20
pointer.<BR> <BR>The injectors are brand new Accel 24 pounders. =
No, I=20
did not have them<BR>flowed before installing as I believed I could =
trust=20
them from the factory.<BR>Is experience counter to=20
this?<BR> <BR>Mike<BR> <BR>At 05:59 PM 12/31/2004, you=20
wrote:<BR>>I look at it this way: BLM's greater than 128 =
means the=20
ECM is having to<BR>>add fuel to keep the mixture right. =
This means=20
it's getting more air than<BR>>it should according to the VE =
tables,=20
which means the table values need to<BR>>be raised by the =
appropriate=20
factor. [(BLM/128)*current VE] is a very<BR>>good formula =
for=20
finding how much to adjust it.<BR>><BR>>If you're getting 160 =
BLM's=20
and you have 80's in the low-rpm VE table,<BR>>then either your =
injectors=20
are much bigger than the 24# that you think<BR>>they are, or you =
have a=20
pretty significant vacuum leak, or you're getting<BR>>a false =
lean=20
reading from the O2. First thing to do is check for=20
exhaust<BR>>leaks before/near the O2, as that will REALLY screw =
with your=20
BLMs. Where<BR>>did you get the injectors? Are they =
new or=20
used, and have they been flow<BR>>tested?<BR></BLOCKQUOTE>
<P>
<HR>
<P></P>_______________________________________________<BR>diy_efi =
mailing=20
=
list<BR>diy_efi at diy-efi.org<BR>http://lists.diy-efi.org/mailman/listinfo/=
diy_efi<BR></BLOCKQUOTE></BODY></HTML>
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