Simple spark plug question - Northstar "tune up"
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Northstar Engines and System Technical Discussion Discussion, Simple spark plug question - Northstar "tune up" in Cadillac Engine Technical Discussion; Just want to get a feel for what people think of plugs for the Northstar engine. I'm pretty well aware ...
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    Tailfin's Avatar
    Tailfin is offline Cadillac Owners Enthusiast
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    Simple spark plug question - Northstar "tune up"

    Just want to get a feel for what people think of plugs for the Northstar engine. I'm pretty well aware that on the 4.x engines, it's of no use to use anything fancy, just the Delco platinum plugs. This hold true for the N*? I only ask because this is my second N*, and both have a minor tendency to misfire when it's rained or very damp, so I'm mulling on tune-up products...

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Use only the correct AC Delco plug in the Northstar. They tend to foul anything else.
    maeng9981 likes this.

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    Ranger's Avatar
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    Re: Simple spark plug question

    A/C Delco 41-950's for your pre-2000 Northstar.

    both have a minor tendency to misfire when it's rained or very damp
    That is not due to the plugs.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Simple spark plug question

    For the 1996, (or any pre-2000 Northstar) with waste spark ignition, the condition and cleanliness of the ICM, connectors, coils and base contacts and plug wires is the determining factor in performance and occasional missing. ANY moisture that collects or condenses on any of those ignition components will cause a nagging miss. Squeaky clean is the answer, because condensing moisture simply LOVES dirt and scum in an ignition system.

    AC Delco #41-950 plugs for pre-2000 engines. AC Delco plug wiresets seem to have the best-fitting boots.

    Google "gm waste spark ignition systyem". Know that Northstars do NOT like cutesy multiple-electrode boutique spark plugs.

    Use this waste spark diagram to properly connect the coil towers, wires, and plugs - make sure that the ICM ground cable is perfect and tight, clean terminals.

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    Tailfin's Avatar
    Tailfin is offline Cadillac Owners Enthusiast
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    Re: Simple spark plug question - Northstar "tune up"

    Cool thanks. Yeah, I understand what waste spark is...each coil fires both of its plugs every cycle. Guess it was too expensive to have 8 coils LOL. The cleanliness issue certainly makes sense. I'll do the cleaning. These things are simply great for that kind of job

    http://www.widgetsupply.com/product/BCU66.html

    I've gone through many of them :-P.

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