So driving Home from Thanksgiving vacation, tachometer goes to 0, then back up. Check engine light on. Keep driving, shut it off a few times, start it, Check engine light goes off but down the road a ways the tach does the same thing. Truck seems to run just fine, got me home the rest of the 150 miles it had to. Did have a "Burp" a couple times cruising at about 60 MPH. I'm hoping it is a sensor going haywire, Seems to have good fuel pressure, I stopped and checked all the connections in the engine bay I could find. Anyone have any Ideas?

Not sure if it would be related or not, but the Oil pressure sending unit went out about two weeks ago, but haven't had a problem since I put the new one in.

Thanks for any help!

Nick.

 

Just giving you a bump Nick. Were all the battery connections clean?

 

yea go get codes pulled on it cause everr time mine does it something goes wrong like now i have code P1693 and it wont start and dont know whats wrong

 

cam sensor or crank sensor, depending on the year, pull the codes

 

Yeah, battery connections are clean. I don't have a scanner, so I am going to slip down to Napa first thing and see if I can pick one up. From everything I have been reading it is either the crank or Cam sensor, or at least it sounds like it. Thanks for the help guys.

Nick.

 

Pulled codes, 0336- crankshaft pos. sensor, and 1690 not in the list? Any ideas? I'm guessing it is a code as a result of the failing sensor. I'm going to get the sensor changed and see what happens.

 

1690-


Fuel injection pump CKP Sensor Does Not Agree With ECM CKP Sensor

Looks like the crank sensor.

 

if you fill in your sig it might make it easier for members to assist you

 

Changed crank sensor, cleared codes- everything A OK right now. Thankks for your help guys. Scooter- I'll fill in my Sig, sorry about that.

 

I kept changing sensors on mine when I had the same symptoms. It ended up being a wire rubbing across the back of the motor. The engine rattle wore a hole in a wire and threw codes for different sensors.