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Oct 29, 2010 | 09:45 AM

#21

guffey24

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Quote:

Originally Posted by Frost

the 896 and 411 PCMs have the driver, are fairly common, and will run that engine well also..

I have a 6.0, computer and wiring harness in my buggy from a 2001

I am sending Jim all three computers and he is going to use a different program for the tune

If CalEditor is right, the test computer has no IAC drivers, my original does, and the 2001 computer has to have them

Oct 29, 2010 | 09:48 AM

#22

CalEditor

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From: Rock Hill SC

Quote:

Originally Posted by guffey24

well this makes some since

my computer numbers
serv. No. 12586242
hwd. no. 12583660

Test computer I got yesterday

serv. no. 12589463
hdw. no. 12589162

The idle just slowly get higher and higher until it max's out.
I use a 12586242 as a test PCM. I installed it in a 2004 C1500 4.3L. The truck started. That was the issue, but the Idle slowly went up.

I personly like the 1mb PCM's, but most of the info I have is on them.

Oct 29, 2010 | 10:17 AM

#23

guffey24

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well neither computer will change the IAC position, both have the same tune exactly. He thinks something is wrong with the tune, so he is going to put a different tune in my original computer

serv no 12586242
hwd no 12583660

Oct 29, 2010 | 10:34 AM

#24

CalEditor

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From: Rock Hill SC

Look at the pictures in this post
http://www.monodax.com/forums/14404-post1.html

Oct 29, 2010 | 11:30 AM

#25

guffey24

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Quote:

Originally Posted by CalEditor

Look at the pictures in this post
http://www.monodax.com/forums/14404-post1.html

I cant see the pictures, not a member

Oct 29, 2010 | 12:07 PM

#26

CalEditor

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From: Rock Hill SC

GTO PCM with IAC driver

PCM without IAC driver

Oct 29, 2010 | 01:02 PM

#27

edcmat-l1

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From: Va Beach

Can the idle be forced up or down using the scanner bi-di controls?

Any chance youse guys have a hand held IAC tester? Nifty little tool.

What does the scanner say? Is it trying to force the IAC one way or the other? Or is it sitting still?

Oct 29, 2010 | 01:07 PM

#28

CalEditor

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From: Rock Hill SC

Quote:

Originally Posted by guffey24

Quote:

Originally Posted by edcmat-l1

His PCM doesn't have the hardware to drive the IAC, so it doesn't mater and it works in the other truck.

Oct 29, 2010 | 02:16 PM

#29

Mike454SS

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From: South Windsor, CT

Quote:

Originally Posted by jimmyblue

Are you the PCM is right for the job? Some PCMs have
the IAC driver circuitry missing.

Measure each IAC phase to GND with a DMM with the
engine running, poke through the insulation with a
needle & clip-lead. If you see less than 100mV on all
of them, the PCM isn't trying.

Ran into this on an '04 Silverado AWD doing a big cable
TB swap, had to go to an '03 Savana PCM.

I don't think you should ever pierce the insulation of any wire for any testing at all...especially wiring in an engine bay...thats just bad plain advice. There is ALWAYS a way to test it without putting a hole (even just a pin ***** is still a hole) that compromises the insulation of the wire.

Oct 29, 2010 | 02:33 PM

#30

guffey24

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Quote:

Originally Posted by edcmat-l1

I can move the IAC plunger in and out by hand, and it idles up or down, but the PCM will not move it, the IAC is working properly

The scanner I have doesnt read IAC counts

it is sitting still, where I move it by hand is where it stays

Oct 29, 2010 | 02:35 PM

#31

guffey24

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Quote:

Originally Posted by CalEditor

His PCM doesn't have the hardware to drive the IAC, so it doesn't mater and it works in the other truck.

wait a minute, your first post said my orginal computer does have IAC drivers

I have an 8 in the hwd no. instead of a 9

Oct 29, 2010 | 02:42 PM

#32

CalEditor

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From: Rock Hill SC

Quote:

Originally Posted by CalEditor

PCM's with IAC drivers

Quote:

SERV. NO.- HWD NO. -
12576106 - 12570558 - 2003 G-VAN, LM7, IAC DRIVERS INSTALLED. ALSO C-TRUCK LM7
12582605 - 12580786 - 2003 C-MPV, L59
12586242 - 12583660 - 2004 C/K-TRUCK, LM7
12586243 - 12583659 - 2004 GTO LS1, IAC DRIVERS INSTALLED
12589462 - 12589161 - 2005 G-VAN, LQ4, IAC DRIVERS INSTALLED
12589463 - 12589162 - 2005 C/K-TRUCK/MPV, LM7, LQ4
12589463 - 12589162 - 2006 C-PICKUP, LM7
12602802 - 12589162 - 2006 C-PICKUP, L59
12602801 - 12589161 - 2006 - 2007 Express, Drive by Wire, (has IAC drivers)

Green is good Red is not

I should have made that more clear like this. Sorry about that