Bruce
01-17-2004, 07:52 PM
When doing the min idle adjustment and you short A-B, there is a fast extend
mode, and the pintle will fully extend in just a couple seconds. The
reason for waiting a min before unplugging it, is to *knock* any carbon
loose so the pintle fully seats in it's orfice.
Depending on your housing, phase of the moon, etc... The fully extended
position should generate a measurement of about .96" from the mounting sholder of the IAC to the rear of the pintle.
Pintle: (the cone shaped piece on the end of the shaft).
And if you swap IACs and nothing seems right be sure to check it's extended
lenght. If it runs backwards, then just swap one set of colored leads, ie
Grn/Blk, with Grn/Wht. Swapping all four does nothing. So double check
your work when your done to be sure.
An IAC can lose phase with the moon and on it's own and invert it's operation. Doing the Min Idle Air adjustment, will reset the IAC. On the GNs the IAC reset occurs at engine shut down and ecm power up. There in no VSS triggered IAC reset, like what's used on say a Syclone.
On some codes like the Syclone there is a min IAC count, well it's kind of a min., where the IAC *likes* to run at idle with a 32 IAC count.
The GN code devotes ALOT, of code for the IAC's operation, and then there is a huge IAC routine for A/C load compensation.
There seems to be a fair amount of personal preference on setting the min idle speed and min IAC counts. I go for 0, since that establishes a min idle, that reguardless of what the IAC does, the engine won't stall. There are several IAC settings in the code that can enhance it's operation, in applications where the drivetrain reciprocating weights have changed alot. ie a 9" converter weights alot less then a 12", especially when you fill em up with fluid.
mode, and the pintle will fully extend in just a couple seconds. The
reason for waiting a min before unplugging it, is to *knock* any carbon
loose so the pintle fully seats in it's orfice.
Depending on your housing, phase of the moon, etc... The fully extended
position should generate a measurement of about .96" from the mounting sholder of the IAC to the rear of the pintle.
Pintle: (the cone shaped piece on the end of the shaft).
And if you swap IACs and nothing seems right be sure to check it's extended
lenght. If it runs backwards, then just swap one set of colored leads, ie
Grn/Blk, with Grn/Wht. Swapping all four does nothing. So double check
your work when your done to be sure.
An IAC can lose phase with the moon and on it's own and invert it's operation. Doing the Min Idle Air adjustment, will reset the IAC. On the GNs the IAC reset occurs at engine shut down and ecm power up. There in no VSS triggered IAC reset, like what's used on say a Syclone.
On some codes like the Syclone there is a min IAC count, well it's kind of a min., where the IAC *likes* to run at idle with a 32 IAC count.
The GN code devotes ALOT, of code for the IAC's operation, and then there is a huge IAC routine for A/C load compensation.
There seems to be a fair amount of personal preference on setting the min idle speed and min IAC counts. I go for 0, since that establishes a min idle, that reguardless of what the IAC does, the engine won't stall. There are several IAC settings in the code that can enhance it's operation, in applications where the drivetrain reciprocating weights have changed alot. ie a 9" converter weights alot less then a 12", especially when you fill em up with fluid.