Question about 2000 Jaguar S-Type

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#4 cylinder randon misfire

I changed tower for plug and at idle speed misses

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  • ronald7139 Jul 12, 2008

    maybe i left out 1 important thing, problem started after secondary chain tensioner on right bank broke. i replaced tensioner, all coils are firing, all injectors are workking, i have 145 psi compression on each cylinders, 46 psi to fuel rail, but still have a miss.also no vaccum leaks. HELP

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It's not so much a random misfire when it's always the same cylinder.

If you did not have this problem before you changed the "tower", you might want to remove it, look at it to make sure everything looks like how it should, reconnect it and make sure it connects to the spark plug. If you have a coilpack, try swapping with another coilpack if possible.

If you havent replaced the sparkplug, try doing so to see if its that simple.

If you've had this problem going on before you changed the tower (not sure what you mean by that exactly), then it might be something else. It could be a fuel injector. There's a few ways to test it, one is to disconnect the electrical plug and see if it makes a difference (while running). No difference = bad injector or no spark. Be sure to check that you have a spark before you check the injector to help isolate the problem.

You could try swaping the #4 injector with another and see if you can cause a different cylinder to miss. If it does, that's your culpret.

Posted on Jun 30, 2008

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