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Odd smell

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YOUR RESEARCHOdd smell

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Replace under warranty)

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Performed · outcome unconfirmed
Yup...one of 2 things - leaking or cracked coolant tank..or in my case a bad water pump(replaced under warranty).
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Odd smell

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Leading evidence: 'Replace under warranty)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace under warranty)' (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.

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Replace under warranty)

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
Yup...one of 2 things - leaking or cracked coolant tank..or in my case a bad water pump(replaced under warranty).
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Odd smell

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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.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

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Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Here's a weird one: When I turn off the engine I detect a sort of sweet, almost syrupy smell coming from the engine. This just startedabout a week ago. I can't detect any smoke. It doesn't smell like clutch or burning oil or coolant or rubber. Any body have any idea what the hell I'm talking about!?

POST 2Original post

sweet smell most likely is boiled off coolant. Doesn't necessarily mean you have a leak, the overflow system does allow for some evaporation....

POST 3Original post

Yep if it is sweet it would indicate coolant. You might note what your temp was, what year etc, as it could be nothing but it could be a cracked coolant tank that is a TSB.

POST 4Original post

Yup...one of 2 things - leaking or cracked coolant tank..or in my case a bad water pump(replaced under warranty). Phattey

POST 5Original post

Coolant? Water pump? I must have made a wrong turn somewhere.

POST 6Original post

Coolant temperatures are held at about 180 to 190F during operation but once you shut the engine down the coolant temperatures will begin to rise, sometimes high enough to begin to boil over even with the coolant system pressure held below sea level. Many modern day cars have a thermostatic switch that will close the electric cooling fan circuit when this happens to prevent the boilover. Don't know if the 996 has this feature or not but it may be worth checking. Also, it very well could be that one of the electric cooling fans has failed but forward motion provides enough cooling until you stop.

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