4pistons
20+ Year Contributor
- 614
- 24
- Nov 13, 2002
-
Port Charlotte,
Florida
91 GSX, 6 bolt, stock cams, head, engine. Stock ECU with TMO chip...I've had it for 22 years so I'm familiar with DSM's and not a newbie.
My car doesn't have a fuel pump connector on the harness in the engine compartment that I can find. I was thinking I had a fuel pressure issue so I searched for one. Found a connector and put 12 volts to it. WHOOPS! That was the tach signal connector! Since then the car ran but breaks up getting into boost. Then I got a 23 error code "Top Dead Center Sensor" (Cam Angle Sensor). Car still ran, I drove it around but ordered a new CAS.
2 weeks later... Put the new one in, it started right up. I warmed it up, adjusted the timing to 5* btdc, drove it around the block. All was good. Left it running then went to get gas 1 mile away boosted to 18# and it ran good. Shut off at the station. Wouldn't start back up. It would run very rough and then die in 2 seconds then flash 23 again. Swapped the old CAS in the parking lot cuz I had it with me, and still no start. Had it Towed 1 mile back. Car sat for a week. Then I did the CAS check where you remove the CAS but leave it plugged in, pulled the spark plugs, clicked ignition to ON, and spun the CAS by hand...all spark plugs lit up! Did the same with the old CAS...all spark plugs lit up! They both seemed good.
Put the engine to TDC, reinstalled the new CAS, and it fired right up idling smoothly. I let it warm up maybe 10 minutes and reset timing to 5* btdc. Idles great. Blipped the throttle a couple times no problem. EXCELLENT!. Shut it off to disconnect the timing light and timing jumper. Time for a test drive. NO START!!! Same f'ing thing... runs rough for 2 seconds and then dies, then flashes 23 again. Shit. Disconnect battery to clear the code and try again. NOPE. No start, code 23 still.
What did I do?? Did I short/blow the ECU when I powered the Tach Signal Connector with 12V? It's only supposed to be a 5V output from the ECU. If I did then why did it run fine twice until it was shut off?
My car doesn't have a fuel pump connector on the harness in the engine compartment that I can find. I was thinking I had a fuel pressure issue so I searched for one. Found a connector and put 12 volts to it. WHOOPS! That was the tach signal connector! Since then the car ran but breaks up getting into boost. Then I got a 23 error code "Top Dead Center Sensor" (Cam Angle Sensor). Car still ran, I drove it around but ordered a new CAS.
2 weeks later... Put the new one in, it started right up. I warmed it up, adjusted the timing to 5* btdc, drove it around the block. All was good. Left it running then went to get gas 1 mile away boosted to 18# and it ran good. Shut off at the station. Wouldn't start back up. It would run very rough and then die in 2 seconds then flash 23 again. Swapped the old CAS in the parking lot cuz I had it with me, and still no start. Had it Towed 1 mile back. Car sat for a week. Then I did the CAS check where you remove the CAS but leave it plugged in, pulled the spark plugs, clicked ignition to ON, and spun the CAS by hand...all spark plugs lit up! Did the same with the old CAS...all spark plugs lit up! They both seemed good.
Put the engine to TDC, reinstalled the new CAS, and it fired right up idling smoothly. I let it warm up maybe 10 minutes and reset timing to 5* btdc. Idles great. Blipped the throttle a couple times no problem. EXCELLENT!. Shut it off to disconnect the timing light and timing jumper. Time for a test drive. NO START!!! Same f'ing thing... runs rough for 2 seconds and then dies, then flashes 23 again. Shit. Disconnect battery to clear the code and try again. NOPE. No start, code 23 still.
What did I do?? Did I short/blow the ECU when I powered the Tach Signal Connector with 12V? It's only supposed to be a 5V output from the ECU. If I did then why did it run fine twice until it was shut off?