Tapping Noise.
06-21-2009, 02:59 PM
#1
2nd Gear Member
Thread Starter
Join Date: Aug 2008
Location: New York
Posts: 312
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
http://www.youtube.com/watch?v=zj2lc...eature=channel
06-21-2009, 03:35 PM
#2
1st Gear Member
Join Date: Nov 2008
Location: Netherlands
Posts: 60
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 !
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 !
06-21-2009, 06:08 PM
#7
6th Gear Member
Join Date: Apr 2007
Location: California
Posts: 10,468
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?
06-22-2009, 12:42 AM
#8
2nd Gear Member
Thread Starter
Join Date: Aug 2008
Location: New York
Posts: 312
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.
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.
Last edited by AlexZi; 06-22-2009 at 12:46 AM.
06-22-2009, 12:53 AM
#9
3rd Gear Member
Join Date: Jul 2008
Location: Santa Monica, Calif.
Posts: 958
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.
CP
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.
CP
Last edited by Carlos Pineiro; 06-22-2009 at 12:58 AM.
