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Weird backfire at WOT

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHWeird backfire at WOT

Leading reported evidence

Check secondary o2 sensor voltage

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
Also check the secondary O2 sensor voltage to make sure they are both at least .85 volts at WOT.
Original post Read captured discussion
Weird backfire at WOT

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Leading evidence: 'Check secondary o2 sensor voltage' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check secondary o2 sensor voltage' (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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1 matching discussions · 6 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Clean bill of health

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 · Original poster
Car runs great otherwise, just got back from the dealer monday with clean bill of health.
Original post Read captured discussion
Weird backfire at WOT

Replace fuel type lately

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
Have you changed fuel type lately?
Original post Read captured discussion
Weird backfire at WOT

Run modified chip

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
Is your car running a modified chip?
Original post Read captured discussion
Weird backfire at WOT

Frequently discussed actions (4)

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

Check secondary o2 sensor voltage

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
Also check the secondary O2 sensor voltage to make sure they are both at least .85 volts at WOT.
Original post Read captured discussion
Weird backfire at WOT

Clean bill of health

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 · Original poster
Car runs great otherwise, just got back from the dealer monday with clean bill of health.
Original post Read captured discussion
Weird backfire at WOT

Replace fuel type lately

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
Have you changed fuel type lately?
Original post Read captured discussion
Weird backfire at WOT

Run modified chip

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
Is your car running a modified chip?
Original post Read captured discussion
Weird backfire at WOT

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.

6 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: 20261027T044418Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Last night I heard a distinct backfire at WOT at about 6500 rpm's, just happened once. Any ideas? Plugs/ fuel? Car runs great otherwise, just got back from the dealer monday with clean bill of health. FWIW, I heard a similar thing while at the track last fall, I attributed it to the POS in front of me that was backfiring like crazy

POST 2Original post

Does it appear to be back firing out of the exhaust or the intake? The intake would sound more muffled. Is your car running a modified chip? Possible timing blip.

POST 3Original post

Have you changed fuel type lately? Hook up your scanner and look for pending DTC's. Also check the secondary O2 sensor voltage to make sure they are both at least .85 volts at WOT. (Any gear).

POST 4Original post

Are you sure it was backfire not the fuel cutoff at rev limit? I'm always bangin it off the rev limiter at the track, but it happens at 7300 RPM not 6500.

POST 5 / ORIGINAL POSTEROriginal post

I have the stock chip, I did fill it up at a cut rate gas station the other day (no choice), forgot about that. It did sound slightly muffled at that, thanks guys. What's a DTC?

POST 6Original post

What's a DTC? Diagnostic Trouble Codes You might want to go fill up with a better gas and take it easy until the majority of fuel in your tank is good stuff.

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