11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHNoisy water pump on a 996
Reported or suspected cause
air filter box leaking (sounded like sucking air)
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
At first I thought it was the air filter box leaking (sounded like sucking air) so I ignored it but it's got gradually worse and now sounds more like grinding/scraping metal and it's quite loud.
Replace (when the clutch is disengaged basically) is this normal
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The car runs absolutely perfectly with no smoke and no loss of water or oil so i don't think its engine related although I have noticed the oil pressure gauge starts at maximum in the morning or when cold, then gradually drops to 3-4 but then once nice and warm it can drop to 1 when idle and in between slow gear changes (when the clutch is disengaged basically) is this normal?
Leading evidence: 'air filter box leaking (sounded like sucking air)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'air filter box leaking (sounded like sucking air)' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace (when the clutch is disengaged basically) is this normal' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
In respect of your noise, coming from the left side it is most likely the water pump (from my experience only).
Replace (when the clutch is disengaged basically) is this normal
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The car runs absolutely perfectly with no smoke and no loss of water or oil so i don't think its engine related although I have noticed the oil pressure gauge starts at maximum in the morning or when cold, then gradually drops to 3-4 but then once nice and warm it can drop to 1 when idle and in between slow gear changes (when the clutch is disengaged basically) is this normal?
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace (when the clutch is disengaged basically) is this normal
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
The car runs absolutely perfectly with no smoke and no loss of water or oil so i don't think its engine related although I have noticed the oil pressure gauge starts at maximum in the morning or when cold, then gradually drops to 3-4 but then once nice and warm it can drop to 1 when idle and in between slow gear changes (when the clutch is disengaged basically) is this normal?
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
air filter box leaking (sounded like sucking air)
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
At first I thought it was the air filter box leaking (sounded like sucking air) so I ignored it but it's got gradually worse and now sounds more like grinding/scraping metal and it's quite loud.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Old forum user Unidentified(11139) wrote:
Hopefully some of you guys can help me with this one...
A few days ago I heard a sound coming from the back of my 996 that I hadn't heard before. At first I thought it was the air filter box leaking (sounded like sucking air) so I ignored it but it's got gradually worse and now sounds more like grinding/scraping metal and it's quite loud.
I kneeled down under the car and it seemed to be coming from underneath in the sump area (oh my god! panic) but i've narrowed it down to the left side, the sound was just resonating through the sump. I phoned a local Porsche specialist who said it could be the water pump failing as this would make the metallic grinding/scraping sound (fingers crossed).
Has anyone else experienced this?
The car runs absolutely perfectly with no smoke and no loss of water or oil so i don't think its engine related although I have noticed the oil pressure gauge starts at maximum in the morning or when cold, then gradually drops to 3-4 but then once nice and warm it can drop to 1 when idle and in between slow gear changes (when the clutch is disengaged basically) is this normal?
It's not under warranty so hopefully it is the water pump and the oil pressure is normal. It's going into the garage in a few days though so I just need your diagnostics before i go.
Thanks!
Migration info. Legacy thread was 85377
Oil pressure at 1 is very low. Mine runs at just under 3 when warm and stationary and goes up to 4 - 5 when under load.
Migration info. Legacy thread was 85392
The oil pressure readings are fine, mine are exactly like this also although 1.5 when very warm, not as low as 1.
rich
Migration info. Legacy thread was 85394
Old forum user Unidentified(11139) wrote:
Maybee the fact that it's done 90k has something to do with the oil pressure. It doesn't drop below 1 and goes back up to almost 5 when accelerating.
What about the water pump?
Migration info. Legacy thread was 85491
If its a failing water pump watch out - if you have poor water circulation as a result you could be in line for overheating and gasket failure. This is exactly what happened to my mates Audi TT at 17 k miles.
Migration info. Legacy thread was 85533
In respect of oil pressure, mine is as low as 1.5 and then straight up to 5 when accelerating.
In respect of your noise, coming from the left side it is most likely the water pump (from my experience only).
Mine went about 2 months ago. The noise (if it is the same as mine) will be a worn bearing. Mine was making the noise intermittantly (due to the fact that when the bearing warms up the noise should reduce) and I thought it may have been an exhaust rattle as the baffles in my left muffler had gone.
One night it got really loud, to the point where by passers were taking a second look at the car (sounded quite sick!). I took a look underneath and no water so I thought I would limp it home. The noise then stopped.
Got home and there was coolant leaking from the water pump area (the hose) however temp all the way home was fine and coolant level was still ok.
Get it checked as there is a little "propeller" which is attached to the bearing and if it comes away can cause some damage to the housing - so I was told.
The water pump is one unit so the whole thing will have to be changed and it will then require a flush of the system and some new coolant.
If it is the issue....
Migration info. Legacy thread was 85621
Old forum user Unidentified(11139) wrote:
Just thought i'd give you guys an update on my water pump. I decided to replace it myself after OPC quoted £400!!! yea right!
It took me 3 hours and i can honestly say it was quite straight forward and only cost me £125.00
Sounds nice and quiet now.
Migration info. Legacy thread was 87877
Old forum user Unidentified(11139) wrote:
..forgot to mention...Sid, thanks for the help! you inspired me to have a go myself.
Migration info. Legacy thread was 87878
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