Does the noise change pitch under load? Louder, quieter, same?
When idling in PARK there is no noticeable ticking sound. When I rev the engine like in the last video that is the sound you will hear.Does the noise change pitch under load? Louder, quieter, same?
The rocker arms all look fine.I looked at the video showing the lifters, and the first one seems to have a visibly badly worn top piece (I'm not sure what it's called). Compare it to the adjacent one to see.
What does the mating rocker arm look like?
Usually a lifter "tick" is a sharp rapping sound when the hood is open, whereas the sound in the video is a bit duller. I also am wondering if the noise is transmission related. Is it manual or automatic?
As for running with both lifters deactivated, I did this for many miles when I had a very bad lifter tick on a road trip. I was worried that the lifter's little wheel would be banging around and twisting on the cam lobe, so I took out the lifters and rocker arms for that cylinder and carried on.
However the car was having real problems on the steep uphills and shaking badly as I was in mountainous terrain. Eventually I decided to do a roadside overhaul of the lifters, which was successful.
PLEASE IGNORE THE PREVIOUS POST BY "SASKADOOMTUBE". POSTING FROM WORK, NOT PAYING ATTENTION, LOGGED IN UNDER A DIFFERENT GOOGLE ACCOUNT - DOH!Does the noise change pitch under load? Louder, quieter, same?
Yes, I've used the stethoscope many times. I think it sounds like it's coming from somewhere around the valve cover but never quite sure. Tried the stethoscope all over the top and around the engine. Nice little clicking sounds around the fuel injectors... Rev the engine while using the scope and although I can hear the nasty sound I can't isolate it. Even the timing belt cover, as denisond3 suggested it could the belt hitting the cover, but that wasn't it.Light to no load noise is definitely perplexing, have you checked oil pressure while it's making the noise?
Maybe a mechanics stethoscope could help narrow down the source of the noise, they're pretty cheap and might get you on the right track.
Removed serpentine belt, started the vehicle, revved the engine and I heard a couple brief ticks and then nothing.Oxygen sensor isn't relevant in starting or initial warmup (open loop).
Try disconnecting the serpentine belt and driving the car for a bit to see if the noise changes.
I followed the "Hydraulic lifter clearance" procedure as described in the Haynes manual:Well it appears to not be the accessories or their drive.
You could try a leak down test, I did this recently on a Honda and confirmed a bad exhaust valve. Of course the head then had to come off for repair.
I have read discussions on other websites people giving advice about the necessity of cleaning lifters in an "ultra clean environment". Along the roadside would probably not meet their standards.I think it depends on where the camshaft stopped turning. It would seem that the lifters on valves that were held open on shutdown would slowly bleed down from spring pressure, so that when the rocker arm is removed, the lifter would expand by sucking in air. Then it would feel springy when tested by hand.
But in my experience lifters usually have very limited travel due to normal varnish build up over the years, so essentially act solid when testing them outside of the engine.
Whenever I have lifter ticking I take out all of them and clean them up. I find this so fascinating that I have even done it on the side of the road in the middle of nowhere.
See post #39 here:
If you have marble sounds it may be valve seat falling out which is the most common thing on the sohc 2.0 The lifters are roller and should not need any cleaning. I thought it was typically insufficient lubrication to the cam lobe? I have heard of the valve seat falling out before on our cars...www.feoa.net