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  1. #1
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    2000 Mustang 3.8 Rough Idle

    I have a 2000 Mustang with a 3.8L engine. It has 101,000 miles and it has been taken very good care of. The engine went to idling very rough and I replaced the spark plugs. However I am hearing a metal ticking sound from the engine. Is this going to be a (head) valve or rocker arm problem, or could an electronic failure also cause this?

  2. #2
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    sounds like a Valve or colapsed lifter. change the oil filter and put in 1 quart of transmission fluid in the oil. it will degunk the engine. after 500 miles change the oil and filter. If you have been using Quaker state skip what I said and take it to a shop it needs professional care.

  3. #3
    Senior Member teengeek88's Avatar
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    i have a 5.0L 95 mustang gotta love mustangs

    no problems with it luckily

  4. #4
    Where's the beef? Scott Tiger's Avatar
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    Originally posted by whitebeard21
    sounds like a Valve or colapsed lifter. change the oil filter and put in 1 quart of transmission fluid in the oil. it will degunk the engine. after 500 miles change the oil and filter. If you have been using Quaker state skip what I said and take it to a shop it needs professional care.
    Does this hurt the engine in any way? How much gunk does this really get out?
    Where's Lunch?

  5. #5
    Living the dream The Real Bingo's Avatar
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    The tapping could just be the fan hitting something. If its still idiling rough, I'd suggest some fuel injector cleaner.

  6. #6
    CRAP! Brainchild's Avatar
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    Could be a number of things.From your description,sounds like a valvetrain noise.Could be a Rockerarm,pushrod,lifter,lobe off the cam,worn valve.If it's causing it to idle rough,I would say it's prolly a lobe off the cam,or a collapsed lifter.Get it checked soon.
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  7. #7
    (AKA) Nakamura sweeper2's Avatar
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    odd, having same prob with my 87 jeep cherokee, tapping from top of engine, rough idle and rough while i drive with backfiring from throttle body and exhaust. Sucks.... 4.0 liter straight six. Heard it's going to cost me alot to fix this.

    either a collapsed lifter or bad lobe on cam or valve in head. pretty soon it will burn vavle


  8. #8
    Ultimate Member Richard Cranium's Avatar
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    Don't discount the spark plug wires from leaking to a ground source giving the sharp noise you hear. This can be seen at night.

    However I think it's going to be valvetrain related.

    Doc

  9. #9
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    Since its a V-6 is there a particular side that this sound is more pronounced? For rough idle it could also be a blown exhaust manifold gasket, How well does the car run after warm up or is the sound there all the time?

    Ryo
    Ryo

  10. #10
    CRAP! Brainchild's Avatar
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    sweeper2,I'm betting on a lobe off the camshaft.That's the general symptoms of that disease

    Hi Doc
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  11. #11
    just passin thru Sweeper's Avatar
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    Bring it to Gardners Automotive. We'll fix it.

  12. #12
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    Re: 2000 Mustang 3.8 Rough Idle

    Originally posted by Benep528
    I have a 2000 Mustang with a 3.8L engine. It has 101,000 miles and it has been taken very good care of. The engine went to idling very rough and I replaced the spark plugs. However I am hearing a metal ticking sound from the engine. Is this going to be a (head) valve or rocker arm problem, or could an electronic failure also cause this?
    The problem can also be from a bad or dirty injector, this also makes a ticking sound. I would check the injectors first before tearing into the heads for valve or lifter trouble.

  13. #13
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    same problem

    just noticed problem after cross country trip. my jeep 4.0 had similar ticking, turned out to be a flapping sticker on the block lol.

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