Identifying Engine knock
#41
For what it's worth, I seem to be tracking the (near?) same problem here:
https://www.jaguarforums.com/forum/x...-member-87491/
23 year experienced Jag tech/shop owner seems to think symptoms point to one cylinder not firing - or at least firing at wrong time.
Will know more in a few days.
https://www.jaguarforums.com/forum/x...-member-87491/
23 year experienced Jag tech/shop owner seems to think symptoms point to one cylinder not firing - or at least firing at wrong time.
Will know more in a few days.
#43
Hello from Poland.
I'm getting exactly the same sound in my 4.0 X308. Knocking when engine cold, louder on D or R, when engine gets hot - knocking gets totally away. The engine always runs perfect. Driving with this from about 8000 km.
My question is - how is your knocking now?
Are you still driving with it?
Still the same/worse? Have you diagnosed or repaired it?
I'm getting exactly the same sound in my 4.0 X308. Knocking when engine cold, louder on D or R, when engine gets hot - knocking gets totally away. The engine always runs perfect. Driving with this from about 8000 km.
My question is - how is your knocking now?
Are you still driving with it?
Still the same/worse? Have you diagnosed or repaired it?
#46
#47
#48
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sparkenzap (12-19-2014)
#49
I had the same problem with engine tick/knock when cold only. It sounded like sharpening a French chef knife with a knife sharpener file. I thought my supercharger was being destroyed.
I eventually found the cause which was a split in the stainless steel metal tube from the exhaust manifold to the EGR valve. The split is hard to spot and is in the corrugated section of the tube. I only found the split when the engine was running and I saw the insulation of the EGR valve tube flapping rhythmically. I replace that tube and problem solved permanently. It's been a year now, no sound and runs perfect.
I thought I had the wrong oil filter (incorrect), need to change the supercharger oil (incorrect), use better quality engine oil (incorrect) which I did, but to no avail. Replacing the EGR valve tube solved the problem!
I eventually found the cause which was a split in the stainless steel metal tube from the exhaust manifold to the EGR valve. The split is hard to spot and is in the corrugated section of the tube. I only found the split when the engine was running and I saw the insulation of the EGR valve tube flapping rhythmically. I replace that tube and problem solved permanently. It's been a year now, no sound and runs perfect.
I thought I had the wrong oil filter (incorrect), need to change the supercharger oil (incorrect), use better quality engine oil (incorrect) which I did, but to no avail. Replacing the EGR valve tube solved the problem!
The following 4 users liked this post by XJR Pilot:
#50
#51
I had the same problem with engine tick/knock when cold only. It sounded like sharpening a French chef knife with a knife sharpener file. I thought my supercharger was being destroyed.
I eventually found the cause which was a split in the stainless steel metal tube from the exhaust manifold to the EGR valve. The split is hard to spot and is in the corrugated section of the tube. I only found the split when the engine was running and I saw the insulation of the EGR valve tube flapping rhythmically. I replace that tube and problem solved permanently. It's been a year now, no sound and runs perfect.
I thought I had the wrong oil filter (incorrect), need to change the supercharger oil (incorrect), use better quality engine oil (incorrect) which I did, but to no avail. Replacing the EGR valve tube solved the problem!
I eventually found the cause which was a split in the stainless steel metal tube from the exhaust manifold to the EGR valve. The split is hard to spot and is in the corrugated section of the tube. I only found the split when the engine was running and I saw the insulation of the EGR valve tube flapping rhythmically. I replace that tube and problem solved permanently. It's been a year now, no sound and runs perfect.
I thought I had the wrong oil filter (incorrect), need to change the supercharger oil (incorrect), use better quality engine oil (incorrect) which I did, but to no avail. Replacing the EGR valve tube solved the problem!
#53
Originally Posted by XJR Pilot
I eventually found the cause which was a split in the stainless steel metal tube from the exhaust manifold to the EGR valve.
Or maybe X308 4.0 without supercharger also has an EGR?
Anyway my engine knock is EXACTLY the same as on Markocosic's video.
#54
I just checked the Jaguar Technical Guide - AJ-V8 Engine and 5HP24 Transmission Introduction book, page 37 on the EGR system it clearly shows a picture of the stainless steel EGR tube which they call the "transfer pipe" connecting from the right (passenger) exhaust manifold to the EGR valve. That transfer pipe was what had the split and was replaced. It costed around $200 dollars and five minutes to replace. The picture shows a non-supercharged engine. See attached PDF.
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brys (12-20-2014)
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