2002 Gmc 2500hd, 8.1l- Intermediate No Spark

[REV353]

Just like the description says, I have intermediate no spark. I have 0 codes and it's been geting worse, sometimes it will start everytime, then others it will take nearly a half hour. I always turnt the key off then try to re start, now on Friday (13th) was the longest time it took to get it started (half hour) it runs great once it starts. Now with in the last few weeks it did die at idle, then restarted on the first time.

 

I read somewhere about a crank sensor, I was thinking of replacing that for starters, being it's only $35. Ideas? Help?

[96chevy7.4L]

I would start with a crank sensor.

[REV353]

Only 1 other opinion, any thoughts on the cam sensor?

[txab]

And you definitely have no spark at all cylinders when having this problem?

[REV353]

Correct, there is no spark. The crank sensor is a known problem, but that is known for dying while running. I can get both crank and cam sensors for $137 at my local dealer, I think I am just going to replace both, I've wasted money in worse places. I did read somewhere that someone else had a problem like this, and the 3rd Tech that worked on it replaced the cam sensor.

[REV353]

I can't get the crank sensor out, I've sprayed the heck out of it with PB and only can get it to spin. I can grab it with a 90 degree needle nose and spin as I lift, the O-ring has to be stuck to the block. Any ideas