I was driving down a country road and I decided to punch it a little, so I did and the second I did I got a huge jerk and the truck was dead so I got pulled over and it would not start, so after 20 minutes of letting it sit and then crankkng, I finally got it to fire up and everything was just normal, so I got it home and started looking around and couldn't find anything wrong so I took it on a test drive and It did it again and this time, no start. I had to be towed home and over and over two hours later no start. Everything that I am reading is pointing to a bad tps, which has been replaced before (I know that the new ones are prone to going bad quickly) any input/ suggestions before I start throwing new parts at it? I always thought that a bad tps wont keep the truck from starting, but would only cause it to run rough Also, I did check for the fuel pump priming and there is fuel pressure

 

Well, start by reading codes.

Typically cam/crank sensors, coils, or PCM would be where I'd look.

 

It hasn't thrown any codes, I think I have it narrowed down to either the tps or the crank sensor. I did get the truck to start fine once it cooled off but then same thing after about five minutes of running

 

Find out what's missing when it won't start. TPS rarely causes a no-start condition, and I haven't ever seen one cause the engine to die while driving.

 

I think I have ruled out a tps, I checked function of that with a scan tool this morning, I am thinking a crank sensor now. Would a crank sensor cause no spark? What is a good way to check for no spark without getting lit up by the coil? I'm going to put a crank sensor on it tonight, needs to be done anyway because it has never been replaced before, thanks for the replies guys

 

Get one from the dealer, yes, they are more expensive, but, they WORK.

I just use a spare spark plug.... hook it up to a random, easy to get to plug wire, ground it out somewhere, and have a bud crank the motor..... see if anything happens. Do NOT hold it in place with your fingers, you can use a screwdriver, or something similar with an insulated handle..... and you can probably avoid doing the 45,000 volt dance.

 

Pcm needs inputs from both cam and crank to get a spark. Timing light on the coil wire will tell you. if you have one do what hayyou said. Delphi or oem sensors only.

 

Do you guys think that a cam sensor would do this? I would be willing to bet it's one of the two

 

I think the pcm will still fire the coil, if it doesn't get a cam sensor signal, it just won't know which injector to fire..... therefore, it probably won't fire any of them. Service manual isn't real clear on that.....

 

No spark, replacing the cps right now