Engine Tapping Sound?
03-18-2012, 01:27 PM
#1
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Engine Tapping Sound?
I had to jump my car yesterday, and noticed a tapping sound when the car started back up... not the dreaded "knock", but more of a loud "taptaptaptaptaptaptap" that I did not notice before.
I have uploaded a video of mine here:
I have compared to the video below of a supposedly "normal" sounding Cayenne engines, but the taptaptaptaptap on my video sounds more pronounced.
Normal
Does everyone else's 4.5 sound like this??
I have uploaded a video of mine here:
I have compared to the video below of a supposedly "normal" sounding Cayenne engines, but the taptaptaptaptap on my video sounds more pronounced.
Normal
Does everyone else's 4.5 sound like this??
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03-19-2012, 02:02 PM
#9
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Didn't sound odd to me.
Once again - a SUGGESTION to EVERYONE..
Visit Harbor Freight and buy one of their mechanic's stethoscopes. Regular price is around $3.99, it's often on sale for $1.99 if you're REALLY thrifty.
Recording engine noises with a cell phone may seem like a great use of technology, but it won't localize the sound enough to determine what is really causing it. The recordings become just another of thousands of engine idling recordings that You-tube must be storing.
Using the stethoscope you can listen for differences between cylinders. If one sounds different then the others, there is very likely a reason. If they all sound alike - chances are good everything is fine and you're just obsessing (easy to do..)
It's one of the most used tools in my toolbox. It's tracked down bad bearings in water pumps and idler pulleys, it's told me that my injectors are louder then my lifters.. and on my other vehicles it has been used numerous times.
$3.99. Great tool. Buy one.
Once again - a SUGGESTION to EVERYONE..
Visit Harbor Freight and buy one of their mechanic's stethoscopes. Regular price is around $3.99, it's often on sale for $1.99 if you're REALLY thrifty.
Recording engine noises with a cell phone may seem like a great use of technology, but it won't localize the sound enough to determine what is really causing it. The recordings become just another of thousands of engine idling recordings that You-tube must be storing.
Using the stethoscope you can listen for differences between cylinders. If one sounds different then the others, there is very likely a reason. If they all sound alike - chances are good everything is fine and you're just obsessing (easy to do..)
It's one of the most used tools in my toolbox. It's tracked down bad bearings in water pumps and idler pulleys, it's told me that my injectors are louder then my lifters.. and on my other vehicles it has been used numerous times.
$3.99. Great tool. Buy one.
03-20-2012, 01:29 AM
#10
Burning Brakes
If you don't want the stethoscope, a coat hangar can help as well. Touching the one end of the hangar on the engine and the other end just in front of the ear canal gives you a sound transducer (old shop trick I learned from a master mechanic 
)
)
03-20-2012, 12:14 PM
#11
Drifting
Yup, good trick, a long screw driver also does the same.
03-20-2012, 09:09 PM
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The actual stethescope works better then the bodges.. BTDT years ago when I was poor. The coathanger one must be done carefully to avoid poking a hole in your eardrum.. 
$3.99. Often on sale for $1.99. And the probe is long enough to get to lots of places a screwdriver can't, and it's also very thin, making it easier to use.
I'm cheap. But I'm not that cheap..
$3.99. Often on sale for $1.99. And the probe is long enough to get to lots of places a screwdriver can't, and it's also very thin, making it easier to use.
I'm cheap. But I'm not that cheap..
