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  1. #1

    Default bosch plugs bad for 99 S-10 2.2L ???

    my truck had a miss. shop replaced fuel pump because fuel pressure was way low. it runs better now but they said that the bosch plugs in it are the reason it is still missing a little. they said that i should replace them with autolite plugs or something like them. also said that the bosch plugs do not work well in an older vehicle with some miles on it. have about 150K on it. is there any truth to this or are they pulling my leg?? anyone else ever heard of this??

  2. #2

    Default

    Alot of people including myself on this site have found that the factory A/C Delco's work best in GM's.

  3. #3

    Default

    x2....On what Silveradotrailblazer has Mentioned on Staying with A/C Delco Plugs......the G.M. Engines Run and Perform Better went A/C Delco Plugs are being Install....Also In Some Cases staying with Factory/OEM Parts is the way to Go.....and this is One of those Cases.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  4. #4
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    stephan's Avatar
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    Default

    X4, but it's AC Delcos you should use, (not Autolites, those would be the Ford plugs) I've never had a problem running off brand (Champions) but my truck is older than yours, & there have been numerous posters on here who've had nothing but problems with running other plugs in their Chevys/GMs'. Usually engine misses but occasionally hard starting etc. They swap the plugs out for a set of AC Delcos & the problems are fixed. It has happend too often to just be a coincidence.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  5. #5

    Default

    X5...aswell as the OEM wires..or HUGE custom MSD's

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

  6. #6

    Default

    Bosch plugs are bad for all GM engines, especially the "special" ones like the +2 and +4. AC Delco is the only way to fly, NGK are also acceptable in a pinch.
    When you hear hoofbeats, look for horses not zebras.

  7. #7
    Jr. Mechanic LoneWolf'burban's Avatar
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    I'm anti bocsh. They didn't work at all in my friends 1963 327 powered Caprice or my 1963 283 powered C-10. Went with an off brand, don't remember what it was, and they worked like stock but wore out sooner.
    1992 GMC Sonoma GT 4.3
    1984 C20 'burban 454
    1963 C10 283
    One lead foot
    Two hands that turn a steering wheel very quickly and very well.

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