'97 1500 No Spark From Coil Madness!!

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January 4th, 2014 | 9:27 PM

jessb_55

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'97 1500 No Spark From Coil Madness!!

‘’?
I have a 97 1500 with a 5.7l and recently it started running rough under load, but idling fine. I parked it for the night and the next morning it then wouldn’t start. Up until that morning I hadn’t been having any trouble with it not starting.
I hooked up my scanner and it was throwing a P0340 and P0341 codes I looked up the codes and then proceeded to head to O’Reilly and pickup a new crankshaft sensor.
I put the new crankshaft sensor in and it still wouldn’t start, I then proceeded to put the old one back in and it still wouldn’t start.
I then noticed that inside the crankshaft sensor box that there was a sheet of paper that said that the new sensor would need to be “relearned” with a scan tool. I checked my service manual and it didn’t mention that and then called to Stealerships and both of them said that wasn’t the case as far as they knew. I also read somewhere else as well that even if the Crankshaft sensor was bad that the truck would still run.
I then proceeded to look into the troublecodes more and then realized that I read the codes wrong and that the codes actually pertained to the Camshaft sensor NOT the crankshaft sensor

I then decided to replace the Camshaft sensor, distributor cap and the rotor. Still wouldn’t start!
I also know that the crankshaft itself isn’t broken as I had to put a wrench on it to install the sensor and the distributor shaft and rotor were turning with the crankshaft.
I then checked the supply and ground on both the Crankshaft and Camshaft sensor plugs and both were getting 12v.
Also there was 12v to the coil and the module that is mounted on the side of the coil.
Then decided to try a coil from a known running truck and still no spark.
Tested all fuses under the hood and in the cab and all tested good.
Checked fuel pressure, that was fine.
Now after putting the new cranksensor in I’m getting a P0339.
Wondering if maybe ECM is bad or something, like it’s not telling the coil to engage!?!? However I would sure think that the truck would still run but in “limp” mode or etc.
I then started to think maybe a bad ground?!? Maybe in the chassis or something?
From the battery I’m getting 12.125ish volts when turning over, and each plug was getting 12.5v with the key on, and the headlights were strong as well.
I even used a jumper wire on the solenoid on the starter to rule out the ignition ON position.
I then ohm tested the coil wire from the coil to the distributor cap and that was well within spec.
I’ve had no recent electrical problems with the truck.

Does anyone have any advice as I’m at my whits end here!

THANKS IN ADVANCE!!!

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