Question about Jaguar XJ8

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1999 JAGUAR XJ8L Got a problem, was driving normal under heavy rain, then going up the hill an a very steep hill, when I reached the top of the hill the engine started to shake, made it home like that, engine under restricted performance,the the naxt day the engine just died, and did not want to start anymore, but if I press the gas all the way in, it started but as soon as I let the gas go, the motor dies, then it did not want to start at all. car gave codes P0174 ,P0300, P0301 ,P1313, P1642, P1111, I checked the spark plugs and found out that they were wet with engine oil, somehow engine oil went thru and the top of the spark plugs were wet, incluiding the plugs cover, took the spark plugs off and the bottom ,where the spark comes out was dry no oil at all, but was carbonized, all black, cleaned all the oil ,replaced spark plugs and put everything back and car does not start, checked the spark out of one plug, and it gave a very little spark, not strong enough to fire the engine up,any ideas?? Thank you

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  • dklmn66 Feb 02, 2010

    Did that but car won'start, could it be the crankshaft sensor the cause of the no spark situation?

    Thank you.

  • dklmn66 Feb 07, 2010

    Thanks .



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P1642 is a possible PCM failure

Oil on top of the plugs may of stressed the computer.

All the other codes point to a misfire issue.

The valve covers gaskets should be replaced to stop this condition and the plugs and the boots should be replaced. .

Then clear all codes and try to restart. If the P1642 is still there then your going to have to use a shop repair this since your going to need the new computer programmed.

Posted on Feb 02, 2010

  • Susan Price Feb 02, 2010

    You replaced the plugs and boots. Do you have a no start code after you cleared the codes.

    Whats throwing me here is you have a CAN code. Anything is possible on why it wont start now. If you have no spark then it can be a coil, crank sensor, ignition module or PCM issue.

    Also check all your fuses for maybe a popped ignition one or PCM.


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P0174 system too lean bank 2, p0300 random misfire, p0301 cylinder 1 misfire, p1313 misfire rate catalyst damage fault bank 1, p1642 fuel pump monitor circuit high input, p1111 intake air temp sensor circuit intermittent high voltage. thats alot of codes all at once. did this vehicle have any codes prior to this? the answer is quite important. if all was good.....replace the ecu. these things just dont throw that many codes, so erratic, all at once.

Posted on Feb 01, 2010

  • Kori Policy
    Kori Policy Feb 02, 2010

    if you have little spark then at least youre getting a signal. try replacing the plugs with bosch or champion(i prefer bosch) and then see what kind of spark you have. these do have tendency to leak around the rocker cover gaskets and then would cause the boots on the plugs to swell and leak to ground. all those codes at once are a little too much though.



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