After replacing a leaking coolant hose and trying to get rid of air bubbles out of the cooling system, I hear this noise. My guess is a knock but after seeing other people’s videos, mine isn’t as loud as theirs. So what could this be?
Just FYI, you can’t make a fair comparison of how an engine sounds using two different cameras w. different microphones, different distance/angle from the engine, different frequency response etc. Even the reflected sound from a bare hood makes a difference compared to a hood liner.
understood. do you hear the tapping noise right before i rev it or starting to rev?
[QUOTE=iogearz;2278843]understood. do you hear the tapping noise right before i rev it or starting to rev?[/QUOTE]I hear it.
What coolant hose did you replace, and did it definitely START after that, OR, do you think you just noticed it b/c the hood was open?
Where I am going with this, if it was the top coolant hose or something in that area, is it possible you bumped the distributor and messed up the timing?
I replaced #9
Well, I haven’t been keeping up to date with my weekly checks as I used to and I just noticed it after replacing that hose. However, I do noticed when I start my car, there’s a quick SQUEAK. But I’m always in a hurry to go somewhere so I forget about it quickly after.
Any other ideas? Would you rule out knocking?
Thanks for helping so far.
Any other ideas? Would you rule out knocking?[/QUOTE]No, I would not rule it out, but there are lots of causes for an engine sounding “rough”, and people often lump them all under “knock”.
Here is another interesting youtube video I came across where someone is trying to localize it to one cylinder:
(I do NOT recommend pulling individual wires on this engine, but you can compare the sound).
I’ve done it before to find out which spark plug was dead. Thanks for the vid
I hear two different sounds in the video. There is the tapping or muffled knocking sound.
There is also a whistle or whine as you let of the gas after revving the engine. That second sound seems familiar, like something I have heard before, but can’t remember the cause.
It sounds a bit like the sound a timing belt makes when it is rubbing on something, or too loose. Unfortunately I do not have enough experience with this car to say that definitely. Maybe welfare knows, or someone else with a good ear for engine sounds can listen to this and tell you. The sound occurs each time when you let off the gas, lasts less than a second, and changes pitch from high to low as the rpm drops.
Oh, that’s my power steering pump. Im slowly leaking fluid.
In that case, I think I might take the p/s and ac belts off before I tried to diagnose it. After that, check the timing with a timing light, and on from there…