[blessedjm99]

i am new to the forum ,I am in need of some assistance i have a 2012 XJ Jaguar 5.0 the engine got messed up i got a motor from another XJ and replace it but the Crankshaft sensor from the motor i got came damaged but it will start the car but it misfire i changed the sensor with two genuine ones and the vehicle does not start i put back the damage one and it start can someone please help me with this what might be the issue here

 

[hamedhbb]

i am new to the forum ,I am in need of some assistance i have a 2012 XJ Jaguar 5.0 the engine got messed up i got a motor from another XJ and replace it but the Crankshaft sensor from the motor i got came damaged but it will start the car but it misfire i changed the sensor with two genuine ones and the vehicle does not start i put back the damage one and it start can someone please help me with this what might be the issue here

Welcome.
this is just an idea:
the crankshaft magnetic ring (part of rear crankshaft seal) should only installed in on orientation. If you have touched it and didn’t put it correctly, ecu could misread the position and won’t start.
the reason you could start engine with bad sensor could be that ECU ignores the sensor and runs using other sensors on a restricted performance mode. I cannot ignore the good sensor though. Try to see if you can start with sensor disconnect.

 

[blessedjm99]

Welcome.
this is just an idea:
the crankshaft magnetic ring (part of rear crankshaft seal) should only installed in on orientation. If you have touched it and didn’t put it correctly, ecu could misread the position and won’t start.
the reason you could start engine with bad sensor could be that ECU ignores the sensor and runs using other sensors on a restricted performance mode. I cannot ignore the good sensor though. Try to see if you can start with sensor disconnect.

Welcome.
this is just an idea:
the crankshaft magnetic ring (part of rear crankshaft seal) should only installed in on orientation. If you have touched it and didn’t put it correctly, ecu could misread the position and won’t start.
the reason you could start engine with bad sensor could be that ECU ignores the sensor and runs using other sensors on a restricted performance mode. I cannot ignore the good sensor though. Try to see if you can start with sensor disconnect.

Thanks for your respond but the the ring was not removed , i will try starting unpluged .

 

[blessedjm99]

Thanks for your respond but the the ring was not removed , i will try starting unpluged .

If it does start unpluged what would you suggest to be my next move

 

[hamedhbb]

If it does start unpluged what would you suggest to be my next move

Checking the camshaft sensor. a faulty crankshaft sensor could put ECU to ignore other timing related sensors that can be also faulty.
Could you read codes off the car?

 

[cutlea01]

As Hamed says, read the DTC codes else you're guessing in the wind.

 

[blessedjm99]

thank you all for the advice but i got it sorted out, had to remove the engine and change the flex plate it was giving off the bad issue so it good now