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Thread: po 300 code help

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  1. #1
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    hey guys im reading all over and some people are saying any cam just about will throw a po300 code .is this true.and that the misfire perameters need tro be set higher.im not feeling it alot and i feel it could be the cam.its just alittle shaky in gear at idle,wen it pops the code.i do feel it alittle more with a/c on.like a bad plug.but i could be looking too hard.ya know .some are saying that low idle will cause it.turn up the idle 500 rpm could fix it?it does do it wen the idle comes down.aaaalllleen what do ya think bud?
    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 .

  2. #2
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    allen did u take the weekend off?were r u ?lol .
    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 .

  3. #3
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    come oooooooooooon.jeeesh i have to drive this thing ,man.could aaaaanyone help me here .with the tune questions or about the cam throwing the code .or turning up the misfire perameters.what about a crankshaft sensor,or camshaft sensor?idk i just want this POS to run normal this is exactly y i demodded so i didnt have to work on it all the time.i ready to smash it in a tree if it doesnt get fixed.im stumped and dont know what to do.when it idles to long the code comes on as soon as the idle gets low after 5 mins .so i dont know if its losing the cylinder and lowereing idle or what im soooooo sick of this.and cant get any answers,ive tried and tried on my own.
    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 .

  4. #4
    Join Date
    Feb 2010
    Location
    Central Texas
    Posts
    300
    My 96 used to do the same thing at idle after so long with ZZ4 cam, it ran great but after idling so long it would set the same code at idle, so if it runs fine just turn off the code, if don't ou need to see what cylinders are showing a misfire with a scan tool and go from there. I also showed this code on my 01 pu after putting in my LS1 I copied over all the fuel tables for a LS1 and flashed my computer, except for the MAF which was used the orignal off my truck. Code 300 would always come up around 80 mph, so after looking at info on scanner I decided that program was lean so I used the program off the camaro as far as programming go, it was to rich according to scanner at low speed so I blended it in program on the MAF tables and no more code 300, trims are closer now and no codes, hopr this helps.

    BB

    BB

  5. #5
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,038
    you're gonna have to ohm out the wires to ensure there is connectivity. ohm each wire at the terminal, don't just poke through the wire plastic covering, becuase the terminal could have a cold joint.
    you're feeling a physical misfire, it has to be an inj, plug, coil, and dealing with wiring, or at least that is the first place i'd start.
    the lean code, well it might have something to do with the misfire, or there is a bad o2 on that side or an exhaust leak.

    it's gotta be wiring, at least that is a very good place to start.

  6. #6
    Join Date
    Jun 2007
    Location
    saratoga springs ,new york {upstate ,adirondacks }
    Posts
    1,878
    Thank u Allen , well appreciated.
    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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