14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhy is my car howling at me...
Leading reported evidence
Replace i'd either have
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
I'd either have to pull out the old work order to see what was replaced or take a look at the PET diagram.
Leading evidence: 'Replace i'd either have' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is '"coke bottle" sound' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace i'd either have' (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.
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Performed · outcome unconfirmed
The dealer changed the valve and the problem disappeared.
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Performed · outcome unconfirmed
As noted in the response, I ran into the same problem on my 2000 Boxster S.
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Discussions that suspect a cause
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Suspected cause
The best I could describe it was the "Coke bottle" sound.
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
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Suspected cause · Original poster
At first i thought it was the fuel pump, so i replaced it and the howling continues...
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My car makes a howling noise from the front end coming from the gas cap area. At first i thought it was the fuel pump, so i replaced it and the howling continues...
I noticed that the howling only occurs when i barely step on the gas pedal, then as soon as i left off it disappears. The noise also goes away after i step on the gas pedal beyond the "barely step-on" point.
Note: the A/C is never on when this occurs.
Is there some sort of pressurization system in the gas tank? what are all the components forward of the battery besides the fuel pump and radiators?
Thanks. Any diagrams of the fuel system or vent system would be great as well
Here's an old post (circa 2002) from RobynC at Babblers that, I think, covers what you are referring to.
As noted in the response, I ran into the same problem on my 2000 Boxster S. The best I could describe it was the "Coke bottle" sound. Was very sensitive to throttle position. It would happen for me when I was just lightly cruising along and any additional throttle would make it go away. The dealer changed the valve and the problem disappeared.
I don't remember off the top of my head. I'd either have to pull out the old work order to see what was replaced or take a look at the PET diagram. I can do the former when I get home unless someone else comes up with the answer before then.
Is it only during the full moon or does it happen with the new moon also? If there are other 996 around do they start answering? Did you take your meds today?
+1 for the tank vent.
Had something similar on a 72 with 1/2 of the evap stuff removed. It was more of a high pitched whistle on that car.
Could be the way the gas noozle flap seals so good. I've tried pouring injector cleaner additive in and its a pain having to hold the flap open to get the stuff into the tank. What I'm thinking is with the gas being drawn out of the tank air has to enter and going past a good seal on that flap it might be acting like a reed in a horn section of a band. Maybe a slight roughing up of the flaps rim would solve it. I figure a red hot poker through it is out of the question
On my 2000 Boxster S the p/n was 996-201-231-01. Based on the price that's a bad thing and I would learn to live with it
http://www.pcars.com/porsche_parts/s.../p_136152.html
This is a source reference. Confirm exact model applicability in the original material.
