Knock knock, got an ear and 30 seconds?
#1
Knock knock, got an ear and 30 seconds?
Greetings all.
So it's my turn to be riddled by a new knocking sound underhood.
The knocking seems most pronounced on cold start but persists when the car is warm. As I've tried to let the film clip reflect, it seems to be loudest right around or under the intercooler area, possibly a bit louder on the left side.
The dipstick tells me oil level is as per spec and it's 5W-30 changed less than a year ago. I believe the spark plugs were changed on the same occasion.
The car runs just fine with no stutter but I do get the impression the engine "moves" a bit more and a bit more unevenly than I would expect when it's idling and I put my hand on it.
I've read a multitude of posts here and elsewhere and realise a knocking noise could be lots of things within or outside the engine and ranging from the trivial to the dire.
So, where to go from here for a relative mechanical ignoramus? Further diagnostic steps? Get my hands on a stethoscope?
Can anyone venture an opinion judging by the sound?
<iframe width="560" height="315" src="https://www.youtube.com/embed/SpuLbRUEHk0" frameborder="0" allowfullscreen></iframe>
Thanks!
/Per
So it's my turn to be riddled by a new knocking sound underhood.
The knocking seems most pronounced on cold start but persists when the car is warm. As I've tried to let the film clip reflect, it seems to be loudest right around or under the intercooler area, possibly a bit louder on the left side.
The dipstick tells me oil level is as per spec and it's 5W-30 changed less than a year ago. I believe the spark plugs were changed on the same occasion.
The car runs just fine with no stutter but I do get the impression the engine "moves" a bit more and a bit more unevenly than I would expect when it's idling and I put my hand on it.
I've read a multitude of posts here and elsewhere and realise a knocking noise could be lots of things within or outside the engine and ranging from the trivial to the dire.
So, where to go from here for a relative mechanical ignoramus? Further diagnostic steps? Get my hands on a stethoscope?
Can anyone venture an opinion judging by the sound?
<iframe width="560" height="315" src="https://www.youtube.com/embed/SpuLbRUEHk0" frameborder="0" allowfullscreen></iframe>
Thanks!
/Per
#2
Join Date: Apr 2014
Location: Jersey, Channel Islands
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#3
#5
#6
Hope it's not the same cause as "my" occasional tapping a few years ago. I ended up with a spun bearing and a seriously munched crankshaft. Somehow the thrust washer(s) had "left the building" as well. The cheapest solution was to put in another engine (used, but with 80K fewer miles).
I'm hoping it's just the SC gears. Mine was making some noise a year or so ago. I changed the oil and all is well since.
I'm hoping it's just the SC gears. Mine was making some noise a year or so ago. I changed the oil and all is well since.
#7
So. Day before yesterday I started the car, heard the knocking (I swear I did) and drove off to see the indy. Twenty-five minute drive, got there, car warm, no knocking to be heard. It's like going to the doctor.
Indy believes it might be something related to the exhaust manifold - at least, something that tightens up when heated.
What he *did* alert me too was the faint hissing sound in the right side of the engine... which turned out be the cracked crankcase breather pipe. So now I'm looking for one of those. More on that in another recent thread.
Thanks for listening :-)
Indy believes it might be something related to the exhaust manifold - at least, something that tightens up when heated.
What he *did* alert me too was the faint hissing sound in the right side of the engine... which turned out be the cracked crankcase breather pipe. So now I'm looking for one of those. More on that in another recent thread.
Thanks for listening :-)
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#14
#15
So. Day before yesterday I started the car, heard the knocking (I swear I did) and drove off to see the indy. Twenty-five minute drive, got there, car warm, no knocking to be heard. It's like going to the doctor.
Indy believes it might be something related to the exhaust manifold - at least, something that tightens up when heated.
What he *did* alert me too was the faint hissing sound in the right side of the engine... which turned out be the cracked crankcase breather pipe. So now I'm looking for one of those. More on that in another recent thread.
Thanks for listening :-)
Indy believes it might be something related to the exhaust manifold - at least, something that tightens up when heated.
What he *did* alert me too was the faint hissing sound in the right side of the engine... which turned out be the cracked crankcase breather pipe. So now I'm looking for one of those. More on that in another recent thread.
Thanks for listening :-)
EDIT: And by "Amazon" I mean "eBay". :-) Part NCA3951CB
Last edited by BillDJohnson; 10-05-2018 at 06:45 PM.
#16
I had a knocking sound which turned out to be the primary timing chain. One of the rails was disintegrated and the chain was riding on the rail frame and both the tensioners were stuck with the spring collapsed.
I am talking about the primary tensioners here in the front of the engine here, not the secondary tensioners on top under the valve covers.
I am talking about the primary tensioners here in the front of the engine here, not the secondary tensioners on top under the valve covers.
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Peter Jones
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08-24-2016 08:12 PM
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