I have a 2000 xj when i went to start it tonight it would fire and run rough for a few seconds and stall out. None of the gauges were working and read no bus on dash were the odometer is.Could this be the fuel pump or relay or could it be crank shaft position sensor?

 

CEL on?
Error codes?

 

i got code #1282 an open or shorted condition detected in the fuel pump relay control unit

 

Try swapping in a known good relay.

 

tried that did the same thing I just put front tow hooks i plugged the canister back in when i put the bumper back on that could've came off I dont know if that has anything to do with it.

 

After doing some research I think it could be ballist resistor I'm not sure though if my year is eqipped with it only one way to find out

 

Nope, you don't have one.

 

The message NO BUS, can indicate a shorted 5 volt management sensor. The most common one is the crankshaft position sensor.

***Try this. Unplug one of the crank sensor connectors. Then turn the key to the ON position. If the NO BUS message is gone, you have found your culprit.

There are 2 connectors for the crank sensor. The one on the sensor itself, and there is also one inside of the engine bay near the firewall / #6 injector. The one inside the engine bay is easier to get to and is the one I'd recommend unplugging.

The above will take you all of 1 minute and will be very helpful in isolating the root cause here.

 

Do you mean crank or camshaft position sensor

 

he means crank sensor but the cam sensor could also do this.

 

Thanks everyone for the help

 

Still getting the no bus no gauges no blower motor could it be the computer?

 

Just trying to figure out what the blower moter has to do with this? Does the engine still start, run rough, then die?

 

Yes it seems to run ok but dies after about 2-3 seconds

 

What's the fuel pressure static & engine running?