05-01-2009, 12:54 AM
I had my 95 coupe in to my mechanic for a few minor service items. The car has been running just great after the cumulative effects of the air box modification, K & N filter replacement, cam shafts properly synchronized after a previous head replacement, and an RS Barn Stage 1 Chip. I also did some exhaust mods where I replaced the rear muffler with 2 FlowMaster Canister units and into a dual exhaust. I had upgraded the steering wheel to the 993 wheel and clockspring (a huge interior facelift modification that I would recommend to anyone!).
Anyway, after the steering wheel install, even though I did the battery disconnect, I got the dreaded airbag light. I asked my mechanic to hook up and clear the code for me, which he had no trouble doing. He also ran a full diagnostic while in there (only $49.00 !!!) and found a fault code with the Hall Sensor. It turned out to be just a bad connection to the sensor.
What I didn't realize is that when the car records a Hall Sensor fault, it automatically delays the ignition timing by 6 degrees !
After fixing the connection to the Hall Sensor and resetting the codes, what a HUGE improvement in performance (feels like a big torque gain and much improved acceleration). As I said, I was pleased with the performance prior to this, so you can imagine how pleased I am now. And all of this to clear a airbag light!
I know it can be very expensive for the dealerships to analyze codes, but as I said, my independent mechanic did it for cheap.
I wonder how many others are running around with missing HP if they have been put off running a code check due to the dealership cost. At $49.00, I think this is something I will have done at least annually.
Anyway, after the steering wheel install, even though I did the battery disconnect, I got the dreaded airbag light. I asked my mechanic to hook up and clear the code for me, which he had no trouble doing. He also ran a full diagnostic while in there (only $49.00 !!!) and found a fault code with the Hall Sensor. It turned out to be just a bad connection to the sensor.
What I didn't realize is that when the car records a Hall Sensor fault, it automatically delays the ignition timing by 6 degrees !
After fixing the connection to the Hall Sensor and resetting the codes, what a HUGE improvement in performance (feels like a big torque gain and much improved acceleration). As I said, I was pleased with the performance prior to this, so you can imagine how pleased I am now. And all of this to clear a airbag light!
I know it can be very expensive for the dealerships to analyze codes, but as I said, my independent mechanic did it for cheap.
I wonder how many others are running around with missing HP if they have been put off running a code check due to the dealership cost. At $49.00, I think this is something I will have done at least annually.
