99 Loud engine squeal

Discussion in 'V8 - Emergency Issues' started by John Casterline, Apr 17, 2018.

  1. John Casterline

    John Casterline New Member

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    I recently bought a 99 with the camshafts already welded. Good. It starts and idles beautifully, but screeches like crazy. Took off the starter and inspected the flywheel, both look clean. Disabled the fuel pump and it made 1 quick squeal, then quiet. Normal sounds turning over. Fuel back on, it fires and squeals. Ideas?
     
  2. stephen newberg

    stephen newberg Moderator Staff Member

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    Well, it sounds like the fuel pump is dying from just that.

    pax, smn
     
  3. John Casterline

    John Casterline New Member

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    Is the fuel pump in the engine compartment? I also did not mention belts have been removed to rule that out.
     
  4. gamefanatic

    gamefanatic SHO Member

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    Can you get an idea approximately where the squeal is coming from? I'm thinking you are looking atathe engine compartment, but is it the accessory side of the engine, or the airbox side, front or rear of engine?


    If its belt related and the belt is in good shape (right size not stretched/cracking) check for oil on pulleys, and how loose the tensioner is. It should be difficult to get the belt to go back on the tensioner if putting back on at that location.
    Could also be coming from alternator if noise is fron rear or by passenger size tire. Usually heard best standing about the mirror location.


    Another location can be the idler pulley. It typicalky vibrates, so it would sound more like a rattle or loose bearings.


    If coming from near the battery, check the water pulley tensioner. Typically you can push it back a little to release some tension while the car is running to know if there is a problem there.


    Fuel pump would be able to be heard in most cases coming from the rear / under neath the car. Should be heard well from inside the car coming from under the back seat. But best to check the fuel rail pressures if this is suspect.


    Try to isolate where the noise is coming from. If you don't have a decible meter a stethascope can help to isolate the problem.
     
  5. John Casterline

    John Casterline New Member

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    Engine compartment. Belts are off. Pulled the front valve cover off, good oil flow. Sounds like it's coming from Center right on motor. Sounds rotational, loud, but even screech. I thought camshaft synchronizer as the sound I have found on a video, but the 3.4 according to my Ford parts dealer shouldn't have on. The car is at my mechanics shop right now or I would take a video. But it does sound like this video.
     
  6. rubydist

    rubydist Moderator Staff Member

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    isn't that where the water pump is on that engine?
     
  7. John Casterline

    John Casterline New Member

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    Water pump would be on the left, passenger side. Belts are removed. Only makes the sound when fuel is delivered. I don't know if it would be due to fuel delivery or combustion. But when fuel was cut off, no sound.
     
  8. stephen newberg

    stephen newberg Moderator Staff Member

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    Again, it really sounds like something connected to the fuel pump itself, considering the conditions you are describing. IIRC the pump is in the tank, but sounds travels easily in fluids.

    pax, smn
     
  9. gamefanatic

    gamefanatic SHO Member

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    On the Gen3 V8, like my Cadillac, the water pump is on the driver side of the engine. It operates off the CAMShaft.

    On the 3.0 OHV's, it would be on the passenger side. Not sure about the DOHC's.
     
  10. gamefanatic

    gamefanatic SHO Member

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    You said you disabled the fuel and it squealed once, then quiet? That pretty much rules out the fuel pump, but it could be a fuel injector. Listening to the youetube you provided, I am hearing a sequential noise, that appears only a specific time in the engine rotation.

    The Cam Sensor would not cause this noise as a synchronizer might. Though the CMP is right next to the water pump on the front head, facing the fans.

    My suspicions would be an injector or valve. If the noise goes away, ever, its likely not mechanical and could rule out the valve.
     
  11. E1

    E1 Crash Tested

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    In my experiences, when one turns off the fuel pump, the engine follows.

    Air, fuel, spark = running engine.
    Air, , spark = quiet because engine she no run no more.

    Also, water pump as stated is on drivers' side and driven from a camshaft which is driven by a timing chain.

    Fuel pressure regulator on fuel rail on passengers side 'could' make a sound with fuel passing through it if it was damaged at the diaphragm somehow. Kind of like a reed on a clarinet.
     
  12. gamefanatic

    gamefanatic SHO Member

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    Yeah, this is where the stethoscope comes in handy for isolating the noise.
     
  13. John Casterline

    John Casterline New Member

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    I got a stethoscope, haven't made it to the shop. Still baffled. Water pump I have mostly ruled out because the noise isnt present when turning over without fuel, unless it starts making it due to higher rpm of the running motor. I'm leaning towards a fuel injector issue but I've never heard any that loud before. Thanks for the responses.
     
  14. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Seems in fact belt related, and if it's related to engine rpm, it can be a toasted alternator bearing (probably the rear one near the exhaust). I had one and it does a similar noise in the video and it's LOUD. The noise will come from center rear of the engine but little more from passenger side.

    You can try removing the belt and turn manually the alternator for a noise. Reaching the alt isn't funny, you have to retreive the front passenger wheel. Alternator have more probabilities to fail than injectors or waterpump on these SHO.
     

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