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Backfire!

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Original source
12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHBackfire!

Leading reported evidence

Check intake and exhaust plumbing

Suggestion or failed attempt

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 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

Check your intake and exhaust plumbing for leaks.

Original post Read captured discussion
Backfire!
Read full discussion summary

Leading evidence: 'Check intake and exhaust plumbing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check intake and exhaust plumbing' (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 · 0 partial discussions

Compare 1 other evidence results

Use engine

Suggestion or failed attempt

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 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

Are you using the engine for braking?

Original post Read captured discussion
Backfire!
Frequently discussed actions (2)

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

Check intake and exhaust plumbing

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

Check your intake and exhaust plumbing for leaks.

Original post Read captured discussion
Backfire!

Use engine

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

Are you using the engine for braking?

Original post Read captured discussion
Backfire!
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.

  • Rennlist: 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

Mechanic found an exhaust leak and fixed it.

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

NEARBY ACTION · LINK UNVERIFIED

Are you using the engine for braking?

Nearby source post

Generation: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Does anyone know how to fix a backfire problem which happens on deceleration?

POST 3 / ORIGINAL POSTEROriginal post

good point! LOL! However, you will still have to stop before a Stop Sign or a red light.

POST 5Original post

Check your intake and exhaust plumbing for leaks.

POST 6Original post

Are you using the engine for braking? Are you blipping the throttle to match revs prior to letting out the clutch? This can cause a backfire if you spin the engine to high rpm's with little or no throttle. A leak as 99 911 said could also be the culprit.

POST 7 / ORIGINAL POSTEROriginal post

Mechanic found an exhaust leak and fixed it. But there is still a little bit of popping. I've found some articles on the web which said that popping on deceleration could be caused by a faulty air injection diverter valve. What do you think? Is there an air injection diverter valve in the 996?

POST 9Original post

this was a great thread; laughed more than in the first part of jumping between letterman and the other guy.

POST 10Original post

I have no leaks in the exhaust system in my car but my PSE pops sometimes during hard deceleration.

POST 11 / ORIGINAL POSTEROriginal post

It seems that you guys are big fans of the popping sound. What I am worried about is that it may be harmful to the exhaust or engine.

POST 12Original post

[QUOTE="...Are you blipping the throttle to match revs prior to letting out the clutch? This can cause a backfire if you spin the engine to high rpm's with little or no throttle..." I blip the thottle to match revs but never enough to cause a backfire...how or why would an over rev cause a backfire...just curious? Jim

This is a source reference. Confirm exact model applicability in the original material.