I have a 98 Z28. The car cranks and tries to start. Only getting spark to 3 cylinders. And fuel to all. Fuel pressure checks out. It keeps throwing p0335 and p0336 crank position sensor code. I replaced the cam and crank sensor still the same issue. I also checked all the grounds. Anyone have these issues before??

 

Anyone?

 

Check wiring from PCM to sensors, you may have a broken wire

 

All wires are good.

 

Check voltage on those sensors u replaced. Mayke sure they are getting power, ground and signal to pcm

 

Ok. I checked all grounds and 12v at the PCM. But not getting any cam sensor signal from brown pcm wire. But if I hook the test light to the positive aide and probe the wire and crank it over it back dires real loud.

 

Ok, break in that wire somewhere. If u have to, hard wire a new line from pcm pinout to sensor.
I always get them confused. Cam and crank sensors. But one out will cause a no start, the other will cause a hard start with backfire, usually cold engine. I believe bad crank sensor signal is no start, bad cam sensor signal is hard start with backfire.

 

My reluctor wheel has some chewed up spots. Could that be my issue. The kicker is im pretty surebwhen I built the motor over a year ago becsuse of a broke rod it had some bad spots but I could be thinking of a different one??

 

The LS1 (GenIII) CKP signal has to look like this (see attached)...