please help

[Chad Kibermanis]

While driving the engine died and will not restart. It will crank but not fire.The engine seems to be getting fuel, the coil is new and delivering spark to all cylinders. I have replaced the crank positioning sensor. I have checked the inertia switch and it has not popped. When I crank the engine, I get a little smoke and what seems like a back fire coming up out of the intake. Can anyone please help?

 

[david4451]

Probably your fuel pump is not working, can you hear it when someone turns ignition on an you near tank(5 second whirring)?
Also that smoke probable your connection to PCV valve blown off at back of drivers side rocker cover, or another vacuum line connected to the inlet manifold.

 

[koda2000]

I hope I'm wrong, but the backfiring makes me think that the timing chains have jumped (typical death of a 4.0L SOHC V6). If this is the case, I suggest you start looking for another vehicle. Like I said I hope I'm wrong.

 

[imp]

I hope I'm wrong, but the backfiring makes me think that the timing chains have jumped (typical death of a 4.0L SOHC V6). If this is the case, I suggest you start looking for another vehicle. Like I said I hope I'm wrong.

@koda2000
Don't the guides and such make noise in advance of loose chain jumping time, usually? How about camshaft position sensor, assuming he verified crank position sensor?

Check fuel pressure, for sure. imp

 

[koda2000]

@imp - Yes, the chains/guides and even the tensioners will usually be the source of making lots of noise before the chains jump, but I imagine a catastrophic failure could also occur. The OP didn't say whether or not his engine had been suffering the "death rattle" before this happened. The backfiring is what makes me think timing.

RE the cam sensor, from what I understand if the cam sensor is bad the engine will still run. It will run like crap, but it will still run.

As you know, with any vehicle problem, you've got to do your due diligence to figure out what's really happened.