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Thread: Chronic miss in 4.6L Northstar

  1. #1
    Join Date
    Jan 2005

    Chronic miss in 4.6L Northstar

    I own a '93 4.6L Northstar with 74,000 miles on it.

    This car has had a chronic missing problem. I had the valve seals replaced (because they were "allowing oil on to the spark plugs" which another Cadillac dealer said is wrong), repalced the plugs, replaced the ignition wiring TWICE, had it hooked up to the dealer's diagnostic machine,etc. I am averaging only 13 miles per gallon for combined street/highway driving. Does anyone have any thoughts on what to do next?

    Could it be the injectors possibly fouled?

    Thanks in advance!

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  3. #2
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
    Automobile(s): 1981 CoupeDeville, 2 1990 Eldorados, 1994ETC ,1992STS
    Join Date
    Feb 2004

    Re: Chronic miss in 4.6L Northstar

    do a search on fuel pressure regulators and read bbobinski's posts, I would also check you coil packs as they can also do this.

  4. #3
    Join Date
    Jan 2005

    Re: Chronic miss in 4.6L Northstar

    Thanks Jeff. I'll do that.

  5. #4
    Join Date
    Jul 2004

    Re: Chronic miss in 4.6L Northstar

    When I changed the plugs on mine I got a miss. I then changed the wires and applied a bit of dielectric grease to the inside of the wire plug. No help. I found that i had gotten a bad plug. Nbr 7 was dead. I changed it out and all was fine for about a week. A miss again developed and I found that Nbr 5 plug had died. I took them all back as the AC plugs do have a warrenty and replaced them all. I have had no other problems.

    You can't allways get a complete set of plugs that are good. I found that out. That particular box may have been dropped thus cracking a porcelin insulator in a couple of plugs. Just can't tell. In the aircraft industry if a plug is dropped it is discarded.
    Just another thing to think about while you are troubleshooting


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