While driving the other day my tach started jumping all around and went to zero a couple times! It did this for a couple minutes and then cleared up and didnt do it again until today! I stoped **** the truck off and it quit doing it! I was wondering if my cam sensor is going out or if i have a bad connection some where?

 

definently not cam sensor

 

Well its throwing the cam sensor code! Psomething i cant really remember! The truck was p-pumped last year and we just put it back to a vp and its taking awhile to get everything straightened out!

 

Also right now im running without the tst since i had to send it back to get repaired! Will not haveing a boost fooler cause it to do this! It only starts to do it when i gets around 25lbs of boost!

 

also is throwing p1690

 

my 01 doesnt have a cam sensor only crankshaft sensor. or maybe its vise versa.

all i know is it doesnt have one behind the starter.

 

The 01 has the cam sensor and not the crank.. I just had the pleasure dealing with the 1690 code and the 341 code. For me it turned out not so good. I replaced the cam sensor but no go. Still 1690 and 341. Swapped in a spare ecm for kicks and no more 341 but still the 1690. Put the old ecm back in and instant 341/1690. Put the spare back and 341 goes away. Dropped in a new pump and no more 1690. So my pump and my ecm went out. My wallet is now significantly lighter.

 

Was your vp acting up? I got a brand new scheid lighting vp! So i really dont think its the pump! But the truck hasnt done this in awhile so i kind of think its a wek cam sensor!