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Thread: Motor shakes

  1. 07-29-2008 04:49 PM #1
    yellowdemon327's Avatar
    yellowdemon327
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    Exclamation Motor shakes

    Heres the prob: 2002 5.3liter with 94,000 miles on it, starts fine-engine is noisy due to lack of oil lubrication on initial start up. but mine is a little extra noisy. seems to idle fine, sometimes lopes a little bit. when i give it little gas and hold it(about 800-900rpms) the engine shakes like crazy-vibrates the whole body. above 1000rpms shaking goes away. ive heard about cam lobes getting worn, but i am not sure that this is the problem. this engine has had much abuse, but always the finest maintainance(Mobile 1 full synthetic every 3000 miles religiously, fuel filter every oil change, new plugs and wires,etc).
    Any help will be extremely appreciated. I would love to continue going to the track, but i do not know if i am just doing further damage to an exsisting problem.
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
    Quote Originally Posted by farmtruc View Post
    Damn dude, take it easy on yourself during personal wacky time lol.
    Sometimes it can get out of hand
    Quote Originally Posted by DamnYankee View Post
    Satan just called - hell froze over.
    Quote Originally Posted by pl4yboy View Post
    I take it like a virgin on prom night... I'm not happy, it hurts, but at the same time, I'm too drunk to care.
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  2. 07-29-2008 04:51 PM #2
    COWL327's Avatar
    COWL327
    COWL327 is offline Senior Member
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    Ignition or injector problem...my 2 cents
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  3. 07-29-2008 04:59 PM #3
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    injector would be my guess.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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  4. 07-29-2008 06:09 PM #4
    yellowdemon327's Avatar
    yellowdemon327
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    huh.... i would have never guessed injectors or ignition...shows how much i know
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
    Quote Originally Posted by farmtruc View Post
    Damn dude, take it easy on yourself during personal wacky time lol.
    Sometimes it can get out of hand
    Quote Originally Posted by DamnYankee View Post
    Satan just called - hell froze over.
    Quote Originally Posted by pl4yboy View Post
    I take it like a virgin on prom night... I'm not happy, it hurts, but at the same time, I'm too drunk to care.
    Reply With Quote Reply With Quote
  5. 07-29-2008 06:30 PM #5
    ff_jeff Guest
    It doesnt like you. Just my 2 cents.
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  6. 07-29-2008 11:00 PM #6
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    yellowdemon327
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    Quote Originally Posted by ff_jeff View Post
    It doesnt like you. Just my 2 cents.
    hey, my truck loves me
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
    Quote Originally Posted by farmtruc View Post
    Damn dude, take it easy on yourself during personal wacky time lol.
    Sometimes it can get out of hand
    Quote Originally Posted by DamnYankee View Post
    Satan just called - hell froze over.
    Quote Originally Posted by pl4yboy View Post
    I take it like a virgin on prom night... I'm not happy, it hurts, but at the same time, I'm too drunk to care.
    Reply With Quote Reply With Quote
  7. 07-30-2008 12:57 PM #7
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    yellowdemon327
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    ttt
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
    Quote Originally Posted by farmtruc View Post
    Damn dude, take it easy on yourself during personal wacky time lol.
    Sometimes it can get out of hand
    Quote Originally Posted by DamnYankee View Post
    Satan just called - hell froze over.
    Quote Originally Posted by pl4yboy View Post
    I take it like a virgin on prom night... I'm not happy, it hurts, but at the same time, I'm too drunk to care.
    Reply With Quote Reply With Quote
  8. 07-30-2008 10:21 PM #8
    txarkitekt's Avatar
    txarkitekt
    txarkitekt is offline Resident Smart Ass™
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    Yeah--sounds like a fuel issue to me as well. No CEL for KR?

    Dave, you could take the injectors and fuel rail off and soak them in some warm water and mineral salts for 1/2 a day. Then use low pressure water to hose them out. Or you can send the injectors off to have them disassembled and cleaned. If you do so, make sure to get some new o-rings for the injectors.

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  9. 08-05-2008 03:09 AM #9
    2500Ak
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    Cam lobes rarely ever go bad in a hyd roller set up. Read the spark plugs to see if you have any lean or rich cylinders. Might run some fuel system cleaner and it wouldn't hurt to swap the inline filter if you haven't done so in a while.
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  10. 08-06-2008 08:15 AM #10
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    99sierra4x4
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    when i did the cam swap on my truck, i put in new injectors at the same time, and before the swap i had the same shake. When i took my fuel rails off, i noticed that the FPR screen had a hole in it, so as far as i know something was in there because it was a decent sized break in the screen.

    FYI you cant buy the screen seperately

    Hope that helps a little.
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