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GM IAC PROBLEMS UPDATED

Posted: Fri Dec 09, 2005 6:57 pm
by Lordprimate
Spec's in Sig.

1.9l twincam NA mota.

All stock saturn ( GM ) sensors/valve.

The v3 pcb is jumpered for IAC use according to the assembly guide.

First Question!

On the Relayboard, is this correct?

S1 = 1A ("A" = "+" positive)
S2 = 1B ("B" = "-" negative)
S3 = 2A ( " " " " )
S4 = 2B ( " " " " )

more less do the A and B signify Pos, Neg....?

ok moving on

My IAC valve...

O-ringed type

Infinate resistance between the Middle 2 pins...

The day I got my relayboard/wireharness/MS2blah blah blah....

I put everything(MS2/harness/RB/GMIAC"in a TB"/CLT/MAT) on my desk, connected everything... Hooked up my Lamda power supply... Bench tested my IAC... Always on And No Heat...

for the IAC valve I have the Saturn Wireing Scematix... (lookn now as i type, to copy correctly)

IAC A HI --------- Light blue wire / White trace
IAC A LOW ------- Light blue wire / Black trace
IAC B HI --------- Light green wire / White trace
IAC B LOW ------- Light green wire / Black trace

With that Blue would be coil 1 , green would be coil 2

I wired
A HI ---- S1
A LOW -- S2
B HI ---- S3
B LOW -- S4


Tired..

I have contacted a friend that is going to come over and turn the key for me.

I will be using a spare throttle body and SAME model IACV "but different unit", to phically watch IACV movement.

While doing so I will note Step Time and test to see how small I can to with out missing steps. When I have proper "Visual" function of the valve.

And

Set the Start Step more accuratly...

Posted: Sat Dec 10, 2005 3:34 pm
by Lordprimate
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Posted: Sat Dec 10, 2005 8:51 pm
by Lordprimate
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Posted: Tue Dec 20, 2005 10:36 am
by Lordprimate
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Posted: Tue Dec 20, 2005 6:16 pm
by eightvalver
Lance, that was some really really good information and explanation about what the settings do that I can use.

Posted: Mon Dec 26, 2005 9:17 pm
by Lordprimate
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Posted: Tue Dec 27, 2005 9:37 pm
by eightvalver
Yes, try the reflash.
The same thing almost happened to me.
What fixed it was switching the polarity of the wires for the IAC motor for both sides.

but I am still hunting for that magic number for consistent operation. I think the newer embedded code releases should solve some of the inconsistent problems.

keep us posted.

Posted: Fri Dec 30, 2005 8:04 pm
by Lordprimate
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Posted: Fri Dec 30, 2005 8:36 pm
by eightvalver
switch the polarity of the wires for the IAC motor for both sides.

Posted: Fri Dec 30, 2005 11:26 pm
by eightvalver
try different start values

Posted: Thu Jan 05, 2006 12:25 pm
by Lordprimate
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Posted: Thu Feb 09, 2006 3:46 pm
by Lordprimate
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Posted: Sat Feb 11, 2006 7:28 pm
by Lordprimate
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