Question about 1992 Cadillac Eldorado

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My 4.9 is ideling rough

Then it did not want to start. so i cleaned the throttle body and changed the spark plugs then it started but still ran rough and was smoking and the fumes is strong.once i cut it off it would not start. I pulled one of the spark plugs and it is black. what else can it be?

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  • willie_to520 Jan 04, 2009

    ronny2051 the spark plugs are also wet.

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Hi what condition were your spark plugs in when you removed them ? were they platinum ? sometime when the platinum pieces fall off a spark plug the gap will get bigger causing the coil to work harder , leading to eventual failure . if you replace one of the coils and the problem persists after changing it swap it to the other coils spot and see if it helps !!

Posted on Jan 02, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 02, 2009

    when you swap in the new coil put it into the cylinder that had those black sooty plugs in them . that would be my first choice




     you have 4 valves per cylinder and 4 cams 2 per head the sparkplugs are in the middle of the valve cover with a long cover covering 4 coil on spark plugs. 
    DANGER DANGER
    these engine have been known to stick spark plugs ( if you break one off you will be removing the head) not an easy job.
    ONLY DO THIS ON A COLD ENGINE
    blow out around the sparkplug to remove any dirt. spray some WD40 or whatever you use into each plug hole. and go have a cup of coffee because this is going to take awhile . slowly remove your plus do not force it they will break. install with a very little neverseze on the threads re install coils and cover plate.
    i know of professionals that have had problems with these.
    the 32 valve is one of the best engines ford ever made and no longer make it they replaced it with the 3 valve and my new one wont even come close to the performance and millage the 32 valve had (wish i had it back it was paid for)

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Its time to clean oil tank of your car,

Posted on Jan 02, 2009

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