Question about 1984 Jaguar XJ

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1989 XJS V12 furl problem

Hello,I just bought an XJS V12 convt.It starts right up but idles rough has pretty good power but blowing black smoke from tail pipes even at idle.I checked two of the spark plugs and they where carboned very bad one was wet and smelled like fuel i did an oil change and the oil was diluted with gas,Could this be due to either a bad fuel injector or a bad cylinder not firing and the fuel going past the rings into the oil?

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Obviously, fuel and oil should never be in the same spot at the same time. You have a dead cylinder and maybe a stuck-open injector. The black smoke is from a too-rich fuel mix, so the cheap things to look for are in the fuel injection system. Look at the fuel pressure regulator as well. Good luck, and don't forget to relieve the fuel pressure before you do any work on fuel inj. engines!

Posted on Aug 22, 2009

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