I'm pulling my hair out on this one, so any help would be greatly appreciated. No Tachometer and throwing a PO340 code (camshaft position sensor).

After all the things I did (listed below), I finally got to start it tonight. Took a couple seconds of cranking, but fired up and ran smooth. Tach was being weird, jumping way high, then went to zero, and it's been there since . 2 minutes of run time, then I got a call and had to go. Came back an hour later, started it up, and it spit out PO340. I was hoping it was a fluke, so I cleared it and restarted, but it came back again.

Voltage looks good at connector, pink wire to black, pink to ground, 12+ volts without engine running.

Before the project, tach was fine, and no codes.

Do I just get a camshaft sensor? Or is it possible I screwed something up somewhere? Does the sensor being bad cause the tach to register 0?

Here are some screenshots from Torque lit, not sure what it all means though. One screenshot at idle, other at 2K revs

Did all this, I have a build thread going....

New lower Manifold gaskets
New Valve cover gaskets
New MPI spider upgrade
New Distributor cap and Rotor
New #3 plug
New idler and tensioner pulleys
New plug wires
Cleaned MAF sensor.
Replaced steering rag joint
Fixed clockspring (radio controls and airbag)
Full cooling system flush

 

Sensor was cracked. Fixed now. What was interesting is the RPMs were fine on my scanner, but didn't show on the tach.

 

Thanks for sharing the solution. Was it obviously cracked just by looking at the sensor or did you have to remove it?

 

I gave up diagnosing and just took the dizzy top all apart again. It was my own fault. Put too long of screw in the rotor, and it broke the magnet off the sensor at the end.