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Discussion summary
YOUR RESEARCHTicking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace aos a year or so ago due
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
I just replaced my AOS a year or so ago due to some smoke issues I was having on start up.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed work
Check vacuum system
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
You can also use a hand vacuum pump to check the vacuum system, it won't tell you where the leak is but if it holds vacuum you know there is not a leak.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Replace aos a year or so ago due' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check vacuum system' (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 performed work without a confirmed outcome
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.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check vacuum system
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
You can also use a hand vacuum pump to check the vacuum system, it won't tell you where the leak is but if it holds vacuum you know there is not a leak.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace oil fill cap
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
On Issue #2: Even though I had just replaced the AOS about 2 years ago I went ahead and did it again and replace the oil fill cap to try to rule out crankcase ventilation issues.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Smoke-test intake
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 noise has not changed at all, so I think my next step is to smoke test the intake to see if there are any leaks there.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (6)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check vacuum system
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
You can also use a hand vacuum pump to check the vacuum system, it won't tell you where the leak is but if it holds vacuum you know there is not a leak.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace oil fill cap
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
On Issue #2: Even though I had just replaced the AOS about 2 years ago I went ahead and did it again and replace the oil fill cap to try to rule out crankcase ventilation issues.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use hand vacuum pump
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
You can also use a hand vacuum pump to check the vacuum system, it won't tell you where the leak is but if it holds vacuum you know there is not a leak.
Ticking Noise When Warm and Other Strange Sounds - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261026T072535Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hey all, hoping some of you can help me diagnose and address some concerning noises that have started occurring on my '98 base Boxster with ~91K miles.
Issue #1:
- My Boxster has recently developed a ticking/tapping noise on the driver side cylinder bank after the car is fully warm. The engine sounds normal until I have been driving for ~15 mins and then this noise starts. From my reading on other posts, this seems to match the noise caused by a stuck lifter. However, there have been varying reports of different oil addressing the problem or other solutions. I am running LiquiMoly 5W-40 right now. I read about switching to a higher viscosity oil could help older engines like mine, should I switch to something like a 15W-50? (I've also read that a lower viscosity oil could help, so not sure which direction to go here).
Video of issue
Issue #2:
- Another recent development is a loud high pitched squealing noise seemingly coming from the passenger side. This only occurs when I am off-throttle & decelerating after the car is warm. This seems to be the same or similar issue as
this thread
. I just replaced my AOS a year or so ago due to some smoke issues I was having on start up. Could it really be bad again and causing this noise?
Providing an update here after a couple weeks of diagnosis. Making some progress but haven't fully resolved these issues.
On Issue #1: I suspected this to be hydraulic lifter noise so I did an engine flush/oil change. No immediate results after this (to be expected). However, I added some
Liquid Moly Hydraulic lifter additive
after the oil change and the lifter noise almost immediately went away. I'll report back after a few weeks of driving, but turns out this stuff may not be snake oil...
On Issue #2: Even though I had just replaced the AOS about 2 years ago I went ahead and did it again and replace the oil fill cap to try to rule out crankcase ventilation issues. The noise has not changed at all, so I think my next step is to smoke test the intake to see if there are any leaks there. I don't have a smoke machine, so going to have to see if I can find/borrow one.
If anyone has experience with common intake/vacuum leaks and how to diagnose, I'm all ears.
I made a couple of DIY smoke machines and was not satisfied with them so bought one... and it turned out to not be much better. There are videos on how to make one, it is simple and cheap.
You can also use a hand vacuum pump to check the vacuum system, it won't tell you where the leak is but if it holds vacuum you know there is not a leak.
From my limited experience I get the impression the vacuum canister, just in front of the AOS, and the lines around it are often the problem. I have tested 3 canisters and all 3 had cracks around the base and leaked. On one engine the vacuum lines near the canister were brittle and broken, while the other lines were OK. Perhaps they get hotter because they are the lines closest to the engine block.
Some good info here
http://986forum.com/forums/boxster-general-discussions/84070-vaccum-canister-replacement-other-vacuum-stuff.html
