YOUR RESEARCHPopping, backfire type noise from exhaust on overrun
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 4 captured posts examined · 0 partial discussions
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.
4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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: 20261026T163944Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently bought a 1999 911 Cab Tip with 67,000 miles on the clock, my first 911. Overall I love the car, but with the recent warmer weather I have noticed when the roof is down a slight popping or back firing type noise coming from the exhaust on the overrun. It is not that loud and does'nt happen all the time and with the hood up you can't really hear it. Does anyone have any idea's? Thanks Mike
fuel consumption affected?? I had this on a different car when the idle throttle switch broke, car always thought it was on throttle...
Not that I have noticed. Car idles OK and has no problem under accleration. I wondered if it could be a small hole in the exhuast close to the manifold?
Expect I'll get moderated for saying it, but it sounds like a zero cost option for improving the sound of a 996 8)
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