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Tapping Noise.

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Old 06-21-2009, 02:59 PM   #1
AlexZi
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Default Tapping Noise.

Hey guys. Ive had a tapping noise coming from my stock 289 for a while now. I can hear it louder now after I put a new exhaust system on, and its very noticeable. I was wondering if anybody could diagnose the problem as Im guessing its not normal for this to be happening. You can hear it clearly in this video. The car was in drive and I was hitting the gas lightly. Its much quieter when the car is idling in park.

http://www.youtube.com/watch?v=zj2lc...eature=channel
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Old 06-21-2009, 03:35 PM   #2
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can you hear from wich side ? and if the sound comes from the heads (valvetrains) or lower in the engine.

Its hard to tell from a video. Take a long screwdriver, put the metal part on the engine on different places and put your ear on the handle. That way you can check the location of the noise.

Could be cam shaft bearings, big end bearings or crankshaft, tilting piston (like my old engine). It doesnt sound healthy to be honest !
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Old 06-21-2009, 03:50 PM   #3
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i would make sure all valves are tight, also are your exhaust manifolds lead all 4 into 1 or are they two Y's?
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Old 06-21-2009, 03:54 PM   #4
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They are long tube headers. All four into one.

And good advice with the screwdriver. Ill try that soon.
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Old 06-21-2009, 04:03 PM   #5
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Maybe something is hitting something? Did you check all he parts near the fan? lol
I am not expert but if its not that could be the pistons clanking. Happened to me before I rebuilt the engine.
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Old 06-21-2009, 05:48 PM   #6
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Look (listen, feel, etc.) all the way around for an exhaust leak. If there are none, check the valves for bent pushrod or mushroomed valve tip. If all that's OK, you should adjust the valves.
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Old 06-21-2009, 06:08 PM   #7
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Sounds like an exhaust leak. Not just from the type of sound, but firstly it's WAY too fast to be valvetrain related(valvetrain noises are at half engine speed). And it doesn't sound bottom end mechanical. Does the sound change once the car warms up?
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Old 06-22-2009, 12:42 AM   #8
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The frequency of the sound depends on how fast Im going/RPM. The more I hit the gas, the more frequent the tapping. If I slowly get onto the gas, it taps slowly. Its hard to tell in the video because Im holding it at pretty much the same RPM the whole time.


PS: This sound was here before the new exhaust, but its more noticeable now because it is amplified by the louder exhaust system.

Im going to annotate the youtube video for when I decrease the RPM and when I put it in park, so you can tell the difference in sound.
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Old 06-22-2009, 12:53 AM   #9
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Just a small test to rule out an unlikely source:

Try stepping on the brake with the motor on (parked) and putting it in reverse. Does the tapping stop? If so, it could be your flex plate.

It is more likely to be a leak from the headers or a valve tapping. Try a tube from gift wrapping paper to listen if you don't want to dive under the car to hear if it's exhaust. Good luck.

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Old 06-22-2009, 12:53 AM   #10
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I'm with 67mustang302. I think it's an exhaust leak. I have several, so I should know the sound
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Old 06-22-2009, 12:56 AM   #11
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This is highly possible, as the guy who did the exhaust has scheduled for me to return in 10-14 days to torque down/re-torque the headers...

Hopefully thats all it is. The only thing is that this sound was there before. Maybe I had an exhaust leak before too...heh.
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Old 06-22-2009, 02:46 AM   #12
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check this easy thing out, just to rule it out, jack up car a little, get a 9/16 wrench and take off the 2 screws that cover the flexplate on the bottom of the tranny. its very easy, then start her up and see if the noise went away. perhaps the plate is on backwards or its bent. perhaps your screws on the flexplate are rubbing somewhere.
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Old 06-22-2009, 04:43 AM   #13
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Quote:
Originally Posted by Starfury View Post
I'm with 67mustang302. I think it's an exhaust leak. I have several, so I should know the sound
Thats what I was thinking as well.

You can get a mechanics stethoscope for about 8 dollars. A'zone or Advance should have it. Its nice to have. You can use it to check for valvetrain noise, lower end noise, or even just the pulleys.
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Old 06-22-2009, 10:03 AM   #14
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Sweet. Will do. Im going to go out side and have a look at some things.
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Old 06-22-2009, 12:35 PM   #15
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I gave up trying to seal all the leaks at my header collector. Tick tick tick tick etc.
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Old 06-23-2009, 04:07 AM   #16
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You can also check for exhaust leaks with the car running. Just use your hand and feel for exhaust coming out somewhere it shouldn't. This works better the farther you go back on the exhuast. It doesn't work that well right at the motor since the fan is moving air. Also you can look for black exhaust residue somewhere that would indicate that there is a leak.
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Old 06-23-2009, 04:12 AM   #17
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Here is what I was talking about. I guess it went up a couple bucks its a little over 10 now.

http://www.jcwhitney.com/autoparts/P...tt=stethoscope
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Old 06-23-2009, 12:49 PM   #18
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Do you have a fan shroud? If so it may be hitting the fan because my mom's 68 did that for a while till I fixed it.
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Old 06-23-2009, 02:42 PM   #19
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Quote:
Originally Posted by 1965fastback View Post
Do you have a fan shroud? If so it may be hitting the fan because my mom's 68 did that for a while till I fixed it.
Nope, no fan shroud here.
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Old 06-23-2009, 07:01 PM   #20
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Then I'd have to go with exhaust leak.
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Old 06-23-2009, 07:01 PM
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1965, 289, adjusting, clanking, ear, engine, ford, half, idling, mustang, noise, rpm, speed, tapping, v8, valve, valves

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