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  1. #1
    Jr. Apprentice
    Join Date
    Sep 2009
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    Deer Park Tx
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    14

    Question Random misfire 97 silverado

    Just get sparkplugs right?
    97 Silverado 5.7.
    Kenwood Head unit, 1 10inch pancake pioneer premier, 1500 watt amp
    Soon to come:
    Two 12' Kicker cvr's, Rollpan,Headers, Exhaust, Tint, 2f 4r drop.

  2. #2
    Jr. Mechanic
    Join Date
    Dec 2008
    Location
    Gettysburg, Pa.
    Posts
    103

    Default Random misfire

    Hopefully sparkplugs will be all you need but just in case here is a site that may help. http://www.random-misfire.com/

  3. #3

    Default

    Plugs are a good idea. AC Delco platinums gapped at .040. The smaller gap might fix the problem by itself. If the rest of the ignition is old, or unknown age, you would be well served to replace the cap & rotor with AC Delco. Napa premium wires are nice too.

    I would also clean the TB, MAF, IAC before hand, and run some Seafoam through the system.

    Here's how.

    http://www.gmtruckclub.com/forum/sho...uction+cleanup

    You'll be amazed how nice the truck runs.
    When you hear hoofbeats, look for horses not zebras.

  4. #4
    Jr. Apprentice
    Join Date
    Sep 2009
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    Deer Park Tx
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    Default

    well i replaced the plugs. still idles like crap. a buddy said it is the Fuel pressure regulator. because he opened the throttle body and smelt raw gas. the part is under the intake manifold correcT?

  5. #5
    Jr. Mechanic
    Join Date
    Dec 2008
    Location
    Gettysburg, Pa.
    Posts
    103

    Default random misfire

    Do your troubleshooting before just throwing parts at it.( http://www.random-misfire.com/ ) A vacuum leak could make it call for more fuel to compensate for the lean condition. You are more likely to get a misfire on lean conditions than rich ones. How did the old plugs look when you changed them? Have you been experiencing any unexplained loss of antifreeze over time? Does it run well when heavy into the throttle and/or at higher RPMs?

  6. #6

    Default

    When mine was giving the Random Misfire I replaced both knock sensors, plugs and wires (about $200 total) before I figured out it was all caused by a plugged catalytic converter. One day it got so bad I couldn't even go over 30 mph without the tachometer redlining! Pulled over on the highway and there was NO air coming from the left side of my exhaust. I just got both cats cut off. ($60.00) It being clogged ended up damaging the piston rings on the left bank and now I have compression issues.

    Check your exhaust.
    Current Daily Driver:
    2003 Chevrolet Silverado 1500 - 4WD - 4.8L V8 - True Dual Exhaust Setup, Cat Delete, Cherry Bomb Glass Packs

  7. #7
    Jr. Apprentice
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    Sep 2009
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    Deer Park Tx
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    Default

    thanks ill check my exhaust

  8. #8
    Jr. Apprentice
    Join Date
    Sep 2009
    Location
    Deer Park Tx
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    14

    Default

    well found the problem. my distributor cap had a crack in it and my rotor cap was bad =/
    but it is still running real rich how do i fix that? like when i turn my truck off it doesnt smell right, i wanna say gas but i don't know.
    when i seafoam it. it will idle like normal correct? its idle is a bit shaky at the moment
    Last edited by 97silvy; 09-21-2009 at 10:22 PM.

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