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Thread: po 300 code help

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  1. #1
    Join Date
    Jan 2008
    Posts
    8,031
    it can take a week before a reply lol goodluck

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    I had that code and it was a failed rocker. Check all the rockers and look for a bent pushrod. Mine was absolutely quiet on the valvetrain since the lifter stuck up in the lifter retainer.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    interesting u say that redc .hmm.wen i powerbrake it to see if its still sputtering i get alitle poping like a rockers off,not bad but alittle pop wen i give it gas and hold the brake.ill have to try looking at them.but the kicker is wen i parked the truck a year ago almost i dont recall it acting that way ,but i did spike boost real high wen the input shaft broke and i never ran it again,so maybe it happened at the same time and because i never drove it after breaking the input shaft i never knew .thanks ,off the wall but possible.im still open for suggestions guy cus i am broke down until i figure this out.
    mods:2004 sierra ext sb,20s ,big brake kit w,hawk pads,air bagged,2006 6.0 lq4 swap,vortec supercharged10psi, air to water intercooled w/ dual electric fans on it ,snow meth injection kit,60lbers, e-fans ,big radiator swap ,cam 218 /222 548/550 comp .hardened prs .1.85 comp roller rockers ,guideplates ,crane double springs,trans 4l65e built .pacesetter l/ts true duals w/x pipe and magnaflows,14 bolt rearend swap ,3.73s,aroemotive fuel pump system w/elec.fuel controller and bypass regulator a/n fittings, taylor 10.5s interceptor gauge,aem w/b a/f ,autometer boost/vac NELSON 93 OCTANE TUNED .

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