benspilk09
10+ Year Contributor
- 128
- 68
- Feb 16, 2010
-
Little Rock,
Arkansas
I'm about at my wits end with this problem.
Car is a 91 TSi AWD, all stock except for ecmlink and a wideband.
The car makes no attempt to speed up the idle when you kick the a/c on. Normal idle is perfect at around 800rpm, it drops to about 500 with the a/c.
I put the car in diagnostic mode and set the BISS per the VFAQ.
The isc buzzes when you turn the key on, but doesn't visibly move. It is clean and the plunger moves freely when you take it apart. It tests perfect across all 4 coils. All the drivers in the ECM look fine. The wiring harness tests fine.
In ECMlink, when I log ISC position and learn idle adjust they're both flatlined at 120 and 176 respectively. No changes, ever. I assume this means the problem is with the ECU? Anyone had an issue like this before?
Any help is appreciated, Thanks!
Car is a 91 TSi AWD, all stock except for ecmlink and a wideband.
The car makes no attempt to speed up the idle when you kick the a/c on. Normal idle is perfect at around 800rpm, it drops to about 500 with the a/c.
I put the car in diagnostic mode and set the BISS per the VFAQ.
The isc buzzes when you turn the key on, but doesn't visibly move. It is clean and the plunger moves freely when you take it apart. It tests perfect across all 4 coils. All the drivers in the ECM look fine. The wiring harness tests fine.
In ECMlink, when I log ISC position and learn idle adjust they're both flatlined at 120 and 176 respectively. No changes, ever. I assume this means the problem is with the ECU? Anyone had an issue like this before?
Any help is appreciated, Thanks!