my car died while driving on monday. it sputtered like i ran out of fuel. i had been on the same tank for only 2 days, and have over half a tank left. i had it towed back to work to take a look.
my first thought was the fuel pump. i got it on a lift and checked pressure. ive got 45psi. i checked the injectors, and they are all pulsing fine. so, in theory i have fuel... i also changed the filter to be safe.
i changed the plugs and wires. the cap and rotor are only a year and a half old, but i checked it anyways, and its all good. i have plenty of spark.
checked compression... after trying to start so many times, i washed the rings, so compression was only 80psi at best. i put some oil down the plug hole to get the rings back up. rechecked compression and im now at about 150-160 across the board.
still wont start!
rechecked the CEL codes, as last time, there were none. now i have code 12 for the RPM signal.
im thinking the crank sensor took a crap. any ideas?
does anyone know where the hell the crank sensor is? i called the lexus dealer, but they said their too busy.
its a shame all of us BMW tachs are so spoiled with the bimmers... it makes it hard to diagnoss the SC in a timely manner.
thanks for the help.
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nope, thats been dissconnected. im thinking the code was actually from spinning the motor over with all the plugs and wires removed and the distributor connector off while i was checking the compression.
honetsly, the only thing left that still makes sence is bad gas... ill have to get a sample on monday.
You guessed right! There are three separate pickup coils in the distributor which measure RPM and crankshaft angle. if any one of these sensors malfunctions, or a shorted wire between there and the ECU, you'll get the code 12. Most likely you could have just isolated the particular sensor, but a whole new distributor would surely do the trick! Good call
I'm throwing a code 12 on a 95 300. I read here that pre 96's don't have cam and crank sensors. I was wondering if anyone found out what sensor in the distributor was bad, rather than replace the distributor itself. I did see where the clip on the coil wire where it connects to the distributor was broken and the plug was loose. The coil plug looked a little rusty, so I ordered
a new one. But the clip and the wire will not be here for a week. Was just wondering if anyone had more specific info...thanks.