/ Register

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

is that knocking?

Discussion in 'Diagnosis/Help' started by pico_741, Oct 20, 2009.

Page 1 of 2
  1. pico_741

    pico_741 Guest

    Hey, got a bit of a problem. after driving in 40 minute traffic on the way back from school, i got on clear roads and noticed a bit of a knocking sound coming from the engine bay. its not literally knocking it sounds a lot like the cars timing is off. could this be a sign of the end of my 3S-GE or is it simply a timing issue ? thanks for reading !
     
    pico_741, Oct 20, 2009
    #1
  2. Mafix

    Mafix Owner Staff Member Administrator Donated!

    hard to say. try and pinpoint the source of the noise.
     
    Mafix, Oct 20, 2009
    #2
  3. 89celicagt

    89celicagt Well-Known Member Staff Member Super Moderator Donated!

    Are you sure it's a rod knock or is it just "pinging"?
     
    89celicagt, Oct 20, 2009
    #3
  4. Celic_GT2

    Celic_GT2 Well-Known Member Moderator Donated!

    get a stethoscope, have a listen around and that will point you in the right direction
     
    Celic_GT2, Oct 20, 2009
    #4
  5. pico_741

    pico_741 Guest

    see thats the weird thing. it only makes noise when I accelerate. do you think the viscosity of the engine oil might be to low for this engine ?
     
    pico_741, Oct 20, 2009
    #5
  6. 89celicagt

    89celicagt Well-Known Member Staff Member Super Moderator Donated!

    I think it's just pinging on you at the moment (combustion occurring too early) Lots of things can cause it - timing is too advanced for whatever reason, leaned out air-to-fuel mixture, too low of octane gas or crappy gas...

    Try a higher octane gas and see it it goes away.
     
    89celicagt, Oct 21, 2009
    #6
  7. Stig

    Stig ST162 Guru Donated!

    Knocking - can be heard at idle, gets louder with revs, no change in power

    Pinging - not heard at idle, tapping noise is constant volume, no power
     
    Stig, Oct 21, 2009
    #7
  8. pico_741

    pico_741 Guest

    you guys are great at this lol. its definitely pinging. ill try the better grade gas and if that doesn't work ill check the timing. thanks for your help ! ill keep you guys posted.
     
    pico_741, Oct 21, 2009
    #8
  9. 86CelicaGTS

    86CelicaGTS Well-Known Member

    timing is too advanced. what kind of gas do you use? if your timing is advanced and you still use 87 octane or other low octane gas it will ping. stock is 10 degrees btdc, mine is set at 20 and i run the best gas i can get (92 or 93 Shell) and my motor runs great.
     
    86CelicaGTS, Oct 22, 2009
    #9
  10. Seank90

    Seank90 Well-Known Member Donated!

    this can be a headgasket issue...if it runs fine then just started knocking i know that there can be a rip in the headgasket... happened me...makes a hell of a noise like steel on steel..
     
    Seank90, Nov 11, 2009
    #10
  11. sega01

    sega01 Guest

    Do you have any improvement in fuel economy with the advanced timing? If I can use higher octane fuel and get enough economy boost to pay for itself while gaining a little power, that would be awesome.

    Thanks,
    Teran
     
    sega01, Dec 10, 2009
    #11
  12. 86CelicaGTS

    86CelicaGTS Well-Known Member

    im not too sure but advanced timing will result in less mpg, the reason for the 92 octane is just so it wont ping. if you run premium on stock timing ur mpg should definately be better, it made a noticable difference for my mpg between 87 and 92 when my timing was stock
     
    86CelicaGTS, Dec 12, 2009
    #12
  13. sega01

    sega01 Guest

    Thanks, I might try that then. Any figures as to how dramatic the MPG change was? I wonder if it's worthwhile for the extra cost. I know the one time I filled my car up on premium it idled lower, but I didn't notice any real changes beyond that. Are the 4th gen Celicas immune to problems with changing octane? I've always heard about myths with the ECU getting used to the higher octane and not functioning properly if you revert back.

    Thanks,
    Teran
     
    sega01, Dec 12, 2009
    #13
  14. Wonderz

    Wonderz Well-Known Member Donated!

    So on my drive to work today i believe i experienced a similar problem.....


    There is a knock/ping, while the car is moving. it seems to be consistent with tire rotation.

    - If the car is not moving and i increase the RPMs there is no knock/ping.
    - While the car is moving and i put the car in neutral, and increase the RPMs there is no change in the knock/ping
    - if the car is in neutral and it increases movement (heading down a hill) the knock/ping rate increases
    - The knock/ping isn't heard/noticed until i am going over 30km/h.

    Checked my oil pressure and it was fine, looked under the hood, and the oil levels were full.

    I am using a 10w30 high millage oil. (last oil change was 1000km ago)
    I just did the timing in November 2009 (2000km ago)
    I just replaced the head gasket in October 2009 (2000km ago)

    I am not sure where to go from here help

    After thinking about it some more i was thinking it might be a CV. any ideas?
     
    Wonderz, Dec 16, 2009
    #14
  15. Stig

    Stig ST162 Guru Donated!

    Definitely a CV, learn to trust your instincts

    Check for torn/worn boots, you can try cleaning and replacing the grease as the knock is usually
    the inner ring (ball cage) running dry.
    When it overheats, it will shatter and the balls shoot out.
    A filthy job, but possible on the car using a paraffin gun & home compressor.

    I've always had exellent results from graphite based CV grease, seems to work better.
     
    Stig, Dec 16, 2009
    #15
  16. Wonderz

    Wonderz Well-Known Member Donated!

    thanks for the help :thumbsup:
     
    Wonderz, Dec 17, 2009
    #16
  17. Seank90

    Seank90 Well-Known Member Donated!

    check for buldging tyres... cv normaly will click when you go around a cornor slow... now unless the diff in the gearbox is screwd which had happened to me it sounds like the rear engine mount is missing or banging off the passenger footwell
     
    Seank90, Dec 17, 2009
    #17
  18. Wonderz

    Wonderz Well-Known Member Donated!

    I checked the front suspension, (cv's and suc, and everything still looked tight, and in good shape. when i lowered the car iand took it for a drive the noise was gone. after about 5 minutes of driving it returned, but it wasn't as bad as before, which leads me to believe it is the lower ball joint. I am hoping to get at it this weekend if weather permits.
     
    Wonderz, Dec 17, 2009
    #18
  19. Seank90

    Seank90 Well-Known Member Donated!

    hmmm... is it a constant or justs bangs over certain times?
     
    Seank90, Dec 17, 2009
    #19
  20. sega01

    sega01 Guest

    My Celica's left CV joint is bad, but I can only hear it in the corners. I think if it's the CV being noisy on the straights you'd have an undriveable car to begin with. I think the low ball joint sounds a lot more likely.

    Good luck!

    --Teran
     
    sega01, Dec 17, 2009
    #20
Page 1 of 2

Share This Page

Welcome to our site! Please take a moment and Register today!