Thread: Motor noise at half throttle

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  1. #1 Motor noise at half throttle 
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    Hey guys I have an 04 comp g and at half throttle to 1/4 throttle it has a almost "loud tapping" to "knocking" noise. Any idea to what I'm hearing guys. I mean it's not a low milage cAr it had 170k so I'm not looking for it to be quiet but noises like this scare me..
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  2. #2 Re: Motor noise at half throttle 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Oil is full and newer?

    Lifter tap, exhaust tick come to mind first.

    Running 91+ octane fuel right?

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  3. #3 Re: Motor noise at half throttle 
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    Always 91. always Castrol syntec 5w30. Only 500miles on oil change maybe exhaust..?
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  4. #4 Re: Motor noise at half throttle 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I'd have to hear the sound/tone to even give a educated guess.

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  5. #5 Motor noise at half throttle 
    Turbo is the way to go. REDCRAPGP's Avatar
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    Take a video

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    Squirrels are my engine. I need a Ford Regal
    04 Comp G.
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  6. #6 Re: Motor noise at half throttle 
    GXP Level Member Grimsin's Avatar
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    I had a noise like you describe. Finally got under the car and it was a heat shield above the downpipe.. was just touching the downpipe. Ripped it off.

    Wonder if it was creating false kr now that i think about it..never know now lol.
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  7. #7 Re: Motor noise at half throttle 
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    Will false knock or knock in general make the cel come on?? It's never had a cel for knock but I have a Cam pos code Could that cause it?
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  8. #8 Re: Motor noise at half throttle 
    Donating Users bandook's Avatar
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    What code?
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  9. #9 Re: Motor noise at half throttle 
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    I'll check and give the codes that come up. But I have a multiple misfire which I changed wires plugs and icm. Still have the misfire code and now after I changed the icm a few months later the cam pos code came up. Emission small leak code. Sensor 2 o2 code from the catless 3"dp.
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  10. #10 Re: Motor noise at half throttle 
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    P0341, p0455,

    That's all for now
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  11. #11 Re: Motor noise at half throttle 
    Killa Bee Scottydoggs's Avatar
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    http://www.obd-codes.com/p0341 cam sensor

    the 455 is a evap leak or purge solenoid. http://www.obd-codes.com/p0455

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #12 Re: Motor noise at half throttle 
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    Thanks.
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  13. #13 Re: Motor noise at half throttle 
    GT Level Member Xorbex's Avatar
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    I have a leak on my header exhaust that sounds like a tick/knock. Do you hear any pfff pfff pff noises at all under throttle? Mechanical ticking and exhaust ticking sound similar but if you listen good you can tell the difference. I unplugged my radiator fans and felt around the exhaust and felt it puffing.
    RIP August 2015 - (2005 Comp G // Custom HAI / S1X Cam / 105 Crow Springs / Mild Ported heads / 3.4 Pulley / SD Headers / Dynomax Catback / Overkill Tune / Comp cams pushrods / LS7 Lifters //)
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  14. #14 Re: Motor noise at half throttle 
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    Good point I'll try that thanks man!!
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  15. #15 Re: Motor noise at half throttle 
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    Started the car up this morning when the motor was cold and the noise I've been hearing is coming from the back valve cover sounds like a valve tap. Is this common with these motors?
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  16. #16 Re: Motor noise at half throttle 
    Killa Bee Scottydoggs's Avatar
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    it could be a broken spring, or a lifter gone bad. only one way to find out, take the v/c off and check em out. you cn run the engine cover off for a bit to watch the rockers.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  17. #17 Re: Motor noise at half throttle 
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    K will do thsnkd
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  18. #18 Re: Motor noise at half throttle 
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    Checked the oil yesterday for shots and gigs and my oil looked glittery. So issues... - loud tapping In rear of motor and glittery oil.

    Any ideas now guys?
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  19. #19 Re: Motor noise at half throttle 
    Awesome Level Member chrsmi1's Avatar
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    Quote Originally Posted by Slopar00 View Post
    Checked the oil yesterday for shots and gigs and my oil looked glittery. So issues... - loud tapping In rear of motor and glittery oil.

    Any ideas now guys?
    Engine go boom. sorry dude
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  20. #20 Re: Motor noise at half throttle 
    I AM PEWPIN! rynoman03's Avatar
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    Sounds like your motor is Fvcked to me! Better start callin some junkyards. You probably spun a bearing.

    Go to www.moradpartscomany.com and see what they have available.

    Or www.carpart.com
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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