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Old 10-20-2011, 04:56 PM   #1 (permalink)
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Question rattling noise at 3000 rpm

so my mechanic told me i have a rod knock my engines makes a vibrating rattling sound at 300 rpm but is really smooth before that and after it drops into gears i dont have an overdrive selenoid im suppose to put in soon so it shifts a little late theres no sounds of metal knocking together when i drive my car or start it up with out revving it what do you think it is guys? i have a feeling the mechanic i took it to knows less about cars than i do and need to find a new one
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Old 10-21-2011, 06:47 AM   #2 (permalink)
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Yep, that's very similar to what mine did when the bearings went.
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Old 10-21-2011, 08:14 AM   #3 (permalink)
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Sounds to me like the beginning of the end for that engine without some major work
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Old 10-21-2011, 04:34 PM   #4 (permalink)
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Quote:
Sounds to me like the beginning of the end for that engine without some major work

wel what do u think i have to do i looked up symptoms on google and alot of people say pull the thottle cable and see if the rattle comes from the belt side of the valve cover or that it might be my timing belt tensioner taking a crap on me, or something with my catalitic converter or the heatshield? heatshield to what? what do u think can it be any of these?
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Old 10-21-2011, 10:52 PM   #5 (permalink)
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Those would be possible if it was just a rattle, the vibration is what makes the bigger concern. A loose throttle cable wouldn't cause vibration. A blown beaing or bad timing would, both require a fair amount of effort with timing being the better sceanrio. Is there any hesitation in engine power as it revs up? What kind of noise is it exactly? A knocking or just a rattle?
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Old 10-21-2011, 10:56 PM   #6 (permalink)
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If you don't have faith in your mechanic a second opinion couldn't hurt. Also, if you have a steel tire iron you can Place the end of that on your engine block, press your ear to it and listen to one cylinder at a time. If there is a metal knock you'll hear it loud and clear, blown bearing will sound like a rough grinding. Don't be worried by the ticking of the injectors, you'll probably hear those too. It would help if you have a friend to rev the motor up while you listen
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Old 10-21-2011, 11:00 PM   #7 (permalink)
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A rattling heat shield would likely be an exhaust heat shield, designed to protect the body of the car and some engine components from the high heat of the exhaust. The exhaust manifold likely has a heat shield and the bolts that hold it in place often rust out and leave the shield loose, and rattling. Trying to shift it around will answer that question. Obviously, do that when then engine is cool. A loose valve cover is less likely and again, just wiggle them and see if they are loose, again, when the engine is cool
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Old 10-22-2011, 12:12 AM   #8 (permalink)
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no theres no hesitation really its pretty smooth up until 3000rpm it almost sounds like it has balls but at 1300-1500 u could hear the faintest rattle about to come on like it does at 3000 but then stops at 1500 hundred and then starts again louder just after 3000 and then it sounds like water running trickling down a drain under my dash sorta where my stereo should be i have no radio so it just the inside of the dash i see and thats where the sound comes from but this is only after i rev to 3000 and beyond im pretty damn sure i dont hear knocking i mean im no experienced mechanic but it doesnt take a sound expert to distiguish a rattling or knocking sound. i do think im hearing ticking of the fuel injectors like u mentioned i dont really know what a tire iron is but im sure i can get a hold of one from someone i know
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Old 10-22-2011, 01:12 AM   #9 (permalink)
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A flat screwdriver will serve the same purpose as the tyre iron.
Put the metal part onto the engine and stick your ear on the plastic part.
It acts like a stethoscope.
You can buy a mechanic's stethoscope for $15-$30 but the screwdriver is just as good for many jobs.
Take care not to get caught in spinning parts or burnt on hot parts.

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Old 10-22-2011, 10:44 AM   #10 (permalink)
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The tire iron being longer is generally why I recommend it for that exact reason :-P
Especially near the front of the engine, you're listening...fan blades 3 inches away.. 8-l
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Old 10-22-2011, 12:17 PM   #11 (permalink)
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if i posted a video on youtube of my car running and posted the link on here wud u check it out for me anyone?
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Old 10-22-2011, 12:41 PM   #12 (permalink)
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Go for it, hopefully will give a general idea of what the noise is
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