Planet-9

Hissing noise from engine area while driving.

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Original source

12 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHHissing noise from engine area while driving.

Leading reported evidence

Check vents

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
Hany checked the vents but it sounds like it's comming directly behind me from the engine.
Original post Read captured discussion
Hissing noise from engine area while driving.

Read full discussion summary

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

Read captured replies

1 matching discussions · 12 captured posts examined · 1 partial discussions

Compare 2 other evidence results

Run between the intake branches

Suggestion or failed attempt

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
Easy enough to find as they're clipped to rails that run between the intake branches.
Original post Read captured discussion
Hissing noise from engine area while driving.

Use tapatalk

Suggestion or failed attempt

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
using Tapatalk
Original post Read captured discussion
Hissing noise from engine area while driving.

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check vents

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
Hany checked the vents but it sounds like it's comming directly behind me from the engine.
Original post Read captured discussion
Hissing noise from engine area while driving.

Run between the intake branches

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
Easy enough to find as they're clipped to rails that run between the intake branches.
Original post Read captured discussion
Hissing noise from engine area while driving.

Use tapatalk

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
using Tapatalk
Original post Read captured discussion
Hissing noise from engine area while driving.

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.

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

Planet-9: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link
That solved my issue.
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T234245Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

So I just noticed this today driving back from autozone. I had my windows up and no music on. I start hearing this fit hissing sound from the engine. I've never heard it before or maybe I just wasn't paying attention or couldn't hear it since I drive with the windows down most of the time. Could it be the belt? I did a search on here and hissing is generally normal belt noise . It only happens when I drive if I stop it goes away instantly so I'm assuming it's the belt. I had the car bumper to bumper inspected 2 weeks ago by gt3 cup mechanics and they said nothing was out of the ordinary

POST 2Original post

Could it be a piece of paper or leaf sucked into one of the side vents? Sent from my iPhone using Tapatalk

POST 3Original post

Hany checked the vents but it sounds like it's comming directly behind me from the engine.

POST 4Original post

If you are able, open up the engine cover behind the seats to see if you can localize the sound.

POST 5Original post

I only hear it when I drive. That may be hard to do. Did some more Internet searching, some people have suggested if the engine cover bolts are not tightened all the way you may her a hissing or air sound.i recently changed my air filter so I may have not tightend a bolt.

POST 6Original post

SSo found out what it was. Kinda of stupid but made sense. The oil cap latch in the back was not secured and snapped in. This is why I was getting that air woosh hiss sound. Now I feel like an idiot...

POST 7Original post

don't be so hard on yourself glad you've found the root cause...and we can all learn from it too. Thanks for sharing!

POST 8Original post

I read somewhere that this could be due to a faulty valve near the manifold. Did u experience that vacuum sound again? hope not.

POST 9Original post

I can't seem to find that article but from memory, it's the "check valve"? not sure...i'm not very mechanically savvy too...sorry

POST 10Original post

The only valves I recall on the intake manifolds are the two vacuum solenoid valves for the resonance flaps in the cross tubes. Easy enough to find as they're clipped to rails that run between the intake branches. This is the 3.4L M97. Not sure about the other engine models. Wouldn't expect these to hiss unless a tube pulled loose.

POST 11Original post

Thanks Les. I've checked and they seem fine. Oil latch cap is shut tight too, so the sound had to be coming from somewhere else. So the search continues...

POST 12Original post

Not closing the oil/ coolant door latch fully one time had me searching for the whoosh culprit when I first got my Cayman . That solved my issue.

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