My car is setting the P0336 code. I have a 96 TA, stock ported heads, cc503 cam, new GM opti, Jethot Longtubes, ory, hooker catback. I have replaced the crank position sensor and the code came back. The engine light will turn off at random times during start up, but then it will come back. My car is running good, with no misfires, no bad idle, no start up hesitation. I cleaned up the wire harness to the crank position sensor but the code is still there. I really want this fixed because im scared to drive my car since i dont know much about this code. what is the worst case scenario for this code? And most importantly, how do i fix it?

 

The code means the crank position sensor (CKP) signal duty cycle is outside the normal range. It will not affect the way the car runs, the sensor was only added in OBD-II to detect misfires. Did ths problem appear right after the cam install? Or did it run for a substantial period of time after the cam install without the code?

Are you sure the reluctor gear is on the crank tight? Any possibility its touching the timing cover or the sensor? Are there any high voltage (plug, coil) wires close to the harness for the CKP sensor?

 

It's a false code from your cam. I went through the same thing. You can't fix it, the only thing you can do is tune out the crank sensor to make the light not appear.

 

This code appeared about 20 or 30 miles into driving the car. This is a new motor. im sure i put on the reluctor on tightly and doubt it is touching, i will double check, i still have to check to make sure there are not any other high voltage wires.

 

any idea why the cam would send false codes? is this common with cc503s?

 

The cam changes the response of the crankshaft to the way the cylinders are firing. The whole purpose of the CKP is to provide the PCM with a measure of the rotational velocity of the crankshaft, which it can compare to the known crank response to the stock cam. Changing the cam is sometimes enought to change the irregularities in the crank rotational velocity, to the point where the PCM will start indicating misfires. The more aggressive the cam, the more likely this is to happen.