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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHWhat's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
Leading reported evidence
Replace good used unit
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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1
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Performed · outcome unconfirmed · Original poster
One of the chain tensioners was also swapped for a good used unit.
What's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
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Leading evidence: 'Replace good used unit' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check price of full rebuilds..)' (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.
Performed · outcome unconfirmed · Original poster
One of the chain tensioners was also swapped for a good used unit.
What's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
Check price of full rebuilds..)
Suggestion or failed attempt
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Unsuccessful attempts
1
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Discussions that contain suggestions
1
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Suggestion · Original poster
At this point, I'm really hoping it's "just" a bad exhaust leak, but will take any advice (and am checking the price of full rebuilds..).
What's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
Clean inside and out
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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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.
What's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
Use imagination i'm afraid
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
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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.
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Suggestion · Original poster
I can't put a link to a video due to being a new member so you'll have to use imagination I'm afraid.
What's wrong with my 996? - Page 1 - 911/Carrera GT - PistonHeads UK
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.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T003124Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hey guys,
My 996, a late 98 3.4, started to exhibit a strong knocking sound coming from the driver's side of the engine. It's the dreaded "sounds like a lifter" type of knock. Very audible at idle, gets faster & louder as revs increase (haven't revved it past 2.5k).
I can't put a link to a video due to being a new member so you'll have to use imagination I'm afraid.
What's weird is that the sound came all of a sudden. I did push the car fairly hard a few hours earlier (up to >> 150mph) for a short period of time (3-4 minutes of fast driving, car fully warmed up). The car was running fine coming home, the noise appeared within 500 yards of starting it again a few hours later. I didn't do anything to do car in between save for a mod on the PSE relay (cutout delete) which seems unrelated. Tried running the car without the exhaust relay wishfully thinking it could be "just" that, but it obviously doesn't make a difference.
What's even weirder is that the car just spent 3 weeks in the shop for a new IMS / clutch, and cylinder #6 was bore checked, with no evidence of scoring found. One of the chain tensioners was also swapped for a good used unit.
The oil is brand new (<150 miles), and the car still has oil & oil pressure. The tailpipes are a bit black on the inside but there's no oily residue in them, nor is there any on the bumper. Not a single code on the ECU.
Also the car has a full history, low miles (45k), and "only" four prior owners in 25 years. Very clean inside and out.
At this point, I'm really hoping it's "just" a bad exhaust leak, but will take any advice (and am checking the price of full rebuilds..). Really a shame as this is a dream car I just purchased less than 200 miles ago, and on which I thought I'd done my due diligence
.
Planning to do that - the shop's 45 miles away so I'll have to arrange for a tow. Was hoping to get some feedback in the meantime.
What surprises me is I've never heard of bore score or failed rod bearing showing up all of a sudden, without codes or anything.
Also, YouTube vid. f7d7so9CBgw sounds very much like my noise, this way I can get around the no-links-for-new-members limitation
This is a source reference. Confirm exact model applicability in the original material.
