engine knock??

Discussion in '1994-2004 V6 Mustang Tech' started by minc2_2000, Aug 17, 2006.

  1. minc2_2000 New Member

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    alright so i just replaced my o2 sensor and today i just pulled my valve cover off and checked the rockers they were all tight but i could turn the rods on the valves that were not compressed (dont know if this is normal or not)?? i checked the rods they all were streight. it is most knotcible around 1500-1800 rpm do you guys think it could be the lifters?
     
  2. sgramer Big LoZer

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    Would you say the noise is at the same tempo as the engine speed, or half the engine speed.

    Scott
     
  3. minc2_2000 New Member

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    it speeds up with the engine.
     
  4. sgramer Big LoZer

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    Is the noise 1-1 with the engine RPM ??

    Scott
     
  5. minc2_2000 New Member

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    i would say so.. its like at idel its slower and 1200 up to 2k it just increases with the rpm and is the most knoticable.
     
  6. sgramer Big LoZer

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    If it is 1-1 with the engine speed it could very well be a rod.
    Do a cylinder balance test and see if the tone changes.
    If it does then you can be fairly sure it is a rod.

    Scott
     
  7. minc2_2000 New Member

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    how do you do the cylinder balance test?
     
  8. KTBug - Kris -

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    Forget that! 2000 model year cars had a PCV problem. It tends to leak oil into the combustion chamber which will develop deposits and cause pinging. Try some Seafoam and see if that helps any.

    Search for "Seafoam" and you will get a ton of threads around here!

    BTW, complain about this to your dealer and you may get a free '01+ valve cover installed that will fix the problem.
     
  9. supramkivtt2jz '00 232

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    first off, i get the exact problem. second, it cant be fixed as far as i know (not permenantly anyway).

    now for your questions.

    yes, you should be able to turn the rods. the noise is the rods actually hitting the guide hole. dont ask me why, cause i have no idea why. if you wait til night and let the area "dry" a bit, take out a flash light and look at the rods. theres scrapes on them. its not terrible, and its not deep. its a very light scrape, but its like that nonetheless. i figure the compcams rr's would fix it, but forget $500. fixing a noise that wont destroy the engine any time soon isnt worth it.

    for a temp fix, tighten the bolts to 29 ft lbs and dont rev above 3000. you wont hear it for a long time to come.
     
  10. minc2_2000 New Member

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    kt i got a 95 3.8! lol.. still havent go my 01 yet :( end of next mo i should have the $$ for the thing.
     
  11. supramkivtt2jz '00 232

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    if youre still under warranty. i already tried... :(
     
  12. minc2_2000 New Member

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    supramkivtt2jz: thanks for the info.. i did knotice on some of the rods minor scratches didnt think anything of it though sence they were streight. well as long as it dont hurt the engine then **** it.. i just travel alot and didnt want somthen to **** up with it knocken like that.
     
  13. KTBug - Kris -

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    But you go by minc2_2000?



    You have to be under warranty still? I always assumed it was a recall, not a warranty issue. That's pretty sneaky on Ford's part! I bet there's thousands of cars out there with this problem and the owners don't even know it. They didn't come to 3.8! :lol:
     
  14. supramkivtt2jz '00 232

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    nah. it was never a recall, just a bullitin. but, i did the next best thing: a blowby filter. keeps all crap from going into the manifold, and its fun to watch as the engine is running. :lol:

     

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  15. KTBug - Kris -

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    That works just as well as a new improved valve cover.
     
  16. minc2_2000 New Member

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    supramkivtt2jz: is that filter so the oil dont suck into your intake? because i knoticed that when i pulled my upper off so i could take the two bolts off for the valve cover that there was alot of oil residue in the runners of the intake!!
     
  17. supramkivtt2jz '00 232

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    pretty much. i did it because my plugs had oil on them when i took them off and decided enough was enough. air circulates through the pcv system, and no more nasty oil crap. the total cost was less than $15 for the filter, hose, clamps and a sprite. if you do it, youll need the glass filter (anyone at autozone will know where its at), 1 ft of 3/8" power steering line, and some clamps. the sprite is optional. :D

    but, im not sure about your pre 99 stang... i dont know how much hose to run or if the pcv system even looks similar.

    edit:
    oil on the plugs is one factor that can lead to and cause knock.
     
  18. KTBug - Kris -

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    Yes!



    Exactly what I was talking about!

    BTW, it's "noticed"! :D
     
  19. sgramer Big LoZer

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    Fords have horrible oil control problems. It is not just the 3.8L either. The later model 5.0s, and the 4.6 have the same issue.
    Is this noise under a no load condition ?? It sounds like you were saying it was. Also is it a tap, or a knock.
    How regular is the noise ?? Is it sporadic, or is rhythmic.

    The easiest way to do a cylinder balance test; is to pull the plug wire one by one. Pull the wire listen, then put it back on, and do the next.

    It sounds like you may have figured it out though.


    Scott
     
  20. supramkivtt2jz '00 232

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    its under load, but right at the point where the engine makes enough power to keep the car moving w/o gaining speed