Looking for anyone who may have broken a timing chain, and would like to know what you did to diagnose the problem. I was driving down the road this afternoon and My truck died instantly. I tried to crank it over and it doesn't seem to build any compression. Any help would be great because I don't know where to start.

 

Did you hear any noise when or right before the truck died? Usually a broken chain results in bent valves.. Pull a valve cover off and have somebody bump the ignition over to see if all the valves are opening and closing.. I have never heard of a timing chain just letting go at a normal cruise, esp on these new engines..

 

No, I didn't here anything. I'm going to do a compression test to see if there is any change from one cylinder to the other. I did however just install a new fuel pump, but you can here it charge the fuel system when you turn the key on. Is there something else that could cause the engine to shut down like that? that could be tied to the fuel system instead of something mechanical. I have been dealing with this for a while. I've replaced the MAF, MAP, fuel filter, plugs, wires and pump. Just got it running and now this.

 

measure fuel pressure when you turn the key to on. My truck just died like that when the fuel pump went. It's possible you got a dud.

 

+2 check the FP

 

I checked the fuel pump this after noon and it is working. The thing that is throwing me off is how fast the motor cranks over. I tried to start the truck today and it spun over so fast you could feel the vibrations through the steering wheel.

 

That is why I thought that it could be the timing chain. If the chain is broken or the engine skipped time then it wouldn't allow the motor to build compression.

 

If you're sure the FP is ok, disconnect your ignition then pull off a valve cover, and crank it over to look for valve train action. Go from there.