knochgoon24
DSM Wiseman
- 6,135
- 92
- Jan 29, 2008
-
Troy,
Michigan
Hi all.
I have a 91 2.0 NT MT. I'm driving myself nuts trying to fix this idle issue. It happens both while the car is rolling in gear with the clutch pressed in, and when rolling with the clutch out with the car in neutral. It has an idle surge from 1200-1500 rpm. Worse when cold, and less so but still noticeable when up to temp.
Also, the car needs the BISS to be screwed in all the way to hold a proper idle. Idle comes up high when first started, might surge once or twice, the settles into a nice smooth idle.
I've tried--
1. Adjusting the idle stop switch and TPS to spec.
2. Rebuilding thr throttle body with new seals.
3. New (used) ECU.
4. Multiple ISCs that all ohm out just fine (4 of them).
5. New injector seals
6. New PCV valve
7. Blocked the PCV valve.
8. 2g TPS, just swapped and set like a 1g TPS.
(At this point, the timing belt snapped. I installed a new (used) head, new TB gaskets, and checked the IM for visible cracks.)
9. Timing checked and set to spec.
10. 2g TPS with a pin added and jumped to replace the 1g idle switch.
11. Different throttle cable tensions (super slack to nearly pulling it open tight).
At this point, the only thing left to try is a new (used) FIAV, or a FIAV blockoff.
Car is almost bone stock. Cheap eBay header.No AC. PS disconnected (leaks).
Do these sound like symptoms of a bad FIAV?
I have a 91 2.0 NT MT. I'm driving myself nuts trying to fix this idle issue. It happens both while the car is rolling in gear with the clutch pressed in, and when rolling with the clutch out with the car in neutral. It has an idle surge from 1200-1500 rpm. Worse when cold, and less so but still noticeable when up to temp.
Also, the car needs the BISS to be screwed in all the way to hold a proper idle. Idle comes up high when first started, might surge once or twice, the settles into a nice smooth idle.
I've tried--
1. Adjusting the idle stop switch and TPS to spec.
2. Rebuilding thr throttle body with new seals.
3. New (used) ECU.
4. Multiple ISCs that all ohm out just fine (4 of them).
5. New injector seals
6. New PCV valve
7. Blocked the PCV valve.
8. 2g TPS, just swapped and set like a 1g TPS.
(At this point, the timing belt snapped. I installed a new (used) head, new TB gaskets, and checked the IM for visible cracks.)
9. Timing checked and set to spec.
10. 2g TPS with a pin added and jumped to replace the 1g idle switch.
11. Different throttle cable tensions (super slack to nearly pulling it open tight).
At this point, the only thing left to try is a new (used) FIAV, or a FIAV blockoff.
Car is almost bone stock. Cheap eBay header.No AC. PS disconnected (leaks).
Do these sound like symptoms of a bad FIAV?