My truck RPM drops with the corresponding tach which has failed intermittantly followed by check engine light. I wait 12 hours or so and restart the truck with no symptons. Now the problem has progressed to the engine shutting off for mili seconds and then running fine. It acts like the solonoid for the fuel is shut off for split seconds.

 

Welcome to DTR. To help us help you, go ahead and fill out your signature with what kind of truck you have (ie:year,tranny,4WD or 2,ect,ect..). Have you checked your codes? It sounds kind of like the "dead pedal". The code you don't want is the P0216. That has been dubbed the "death code" on this forum meaning your injection pump is toast. Hope this helps some. Let us know if you have any codes. You can check code by cycleing the key on and off 3 times and the third time leave it in the run position (not running). Good luck

Eric

 

I didnt realize help was this easy to come by. Thanks again

 

If the tach is going to zero and giving you a CEL, your Crank Position Sensor may be on its way out. The truck will run, but poorly, limp mode. But check the codes (key on-off-on-off-on, watch the odometer window for the 00-02 models), and let us know what they are. If you have a 98 or 99, you'll need a scanner of some kind to pull them.

 

98.5-00 ckp is bad, 01 and above cmp is bad

 

The two codes are 1690 and 336, any idea on what that is?

 

I got a 336 code which according to my reader says a crank position sensor. Is that good or bad?

 

What is ckp/cmp? I'm new and dont understand your codes.

 

336 says you have a bad crank position sensor. 1690 says your crank sensor doesn't agree with the cam sensor. Replace the crank position sensor, and clear the codes, and it should be back to normal.