BlueMark
Banned
New here, need ideas, help-
I had a Weird no start yesterday, I drove my 96 mark 8 about 50 miles and it ran perfectly as always, then sat for about 4-5 hours. When I started it, it ran rough, so I shut it off and hooked up a scanner to see what tripped the CEL. My scanner (Acton 9145) would not communicate with the ECM? I use this thing all the time on my and other's cars, and I disconnected and reconnected it, no communication. I disconnected the neg post to the battery, waited a minute and hooked it up-now, NO start at all, just crank. Tried the scanner again, no communication-and i then noticed that the radiator fan was running with the key on-car was not hot, it ran maybe 10 seconds before I shut it off after having sat for over 5 hours. I disconnected BOTH battery connections and held the lugs together for a minute, hooked it up again and it just cranked the first couple of times-then it started, and was smooth and quiet. I drove home (50 miles) with no problems whatsoever-it ran perfectly? when I got home, i hooked up the scanner-it worked also, communicated immediatly. No codes (of course, bat was disconnected) so anyone here have any ideas? Would a crank sensor on it's way out do this? Why would the radiator fan run with the key on when the engine was not hot or even warm? No communication with the scanner was strange too, my first thought was a bad ECM? After getting home, I started it later when it was cold and no problems at all-starts right up, smooth and quiet, like it never happened.
thanks
I had a Weird no start yesterday, I drove my 96 mark 8 about 50 miles and it ran perfectly as always, then sat for about 4-5 hours. When I started it, it ran rough, so I shut it off and hooked up a scanner to see what tripped the CEL. My scanner (Acton 9145) would not communicate with the ECM? I use this thing all the time on my and other's cars, and I disconnected and reconnected it, no communication. I disconnected the neg post to the battery, waited a minute and hooked it up-now, NO start at all, just crank. Tried the scanner again, no communication-and i then noticed that the radiator fan was running with the key on-car was not hot, it ran maybe 10 seconds before I shut it off after having sat for over 5 hours. I disconnected BOTH battery connections and held the lugs together for a minute, hooked it up again and it just cranked the first couple of times-then it started, and was smooth and quiet. I drove home (50 miles) with no problems whatsoever-it ran perfectly? when I got home, i hooked up the scanner-it worked also, communicated immediatly. No codes (of course, bat was disconnected) so anyone here have any ideas? Would a crank sensor on it's way out do this? Why would the radiator fan run with the key on when the engine was not hot or even warm? No communication with the scanner was strange too, my first thought was a bad ECM? After getting home, I started it later when it was cold and no problems at all-starts right up, smooth and quiet, like it never happened.
thanks
