12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPsm and abs error, shooting flames??
Leading reported evidence
Replace mass air flow sensor
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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1
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1
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Performed · outcome unconfirmed · Original poster
yeah I w finally messed around with it a bit today, only codes were MAF hot film and misfires on every cylinder, so I replaced the Maf with a brand new one AGAIN and the code didn�t go away.
Leading evidence: 'Replace mass air flow sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect mass air flow sensor' (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.
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Suggestion
Don�t know if this will help much, but disconnecting the MAF on my car causes those two lights to show up.
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Suggestion
If that's the case then oil change ASAP as you figure this out right?
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.
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Suggestion
With cats that oxygen would have been used inside fhe cats to convert HC --> H2O (= water vapour) + CO (and that to CO2) and all would be fine.
Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
yeah I w finally messed around with it a bit today, only codes were MAF hot film and misfires on every cylinder, so I replaced the Maf with a brand new one AGAIN and the code didn�t go away.
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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My 02 c4 has had a very strange issue for about two weeks, it started off intermittently, but has slowly gotten worse to the point that it�s constant now. The issue is, in high rpm�s ( Around 3.5-4k ) it�ll throw the psm and abs error lights and also bog down REALLY bad. Also when it bogs down it backfires and shoots flames. My only thought is since It�s catless but dosent have a tune yet maybe the 02 sensors are fouled??
Does anyone know what could be causing this? Thanks in advance! Link to videos of the issue: https://youtube.com/shorts/gD5X1OJ8o2I?si=jqyt3DFpGatybV4A
Your Monitoring O2 sensors that normally sit downstream of the cats see O2 levels that had there still been cats installed would indicate a too lean mixture. With cats that oxygen would have been used inside fhe cats to convert HC --> H2O (= water vapour) + CO (and that to CO2) and all would be fine. Since you dont have cats, this ixygen is not used but since the ecu has no means of taking this fact into account, it richens the mixture to reduce O2 levels in the exhaust gases. Your mixture is now so rich, that it doesn't ignite through spark inside the cilinder (therefore no power but bogging down of the car) but needs the heat of the exhaust to burn and that's why you hear the bangs and see the flames.
Engine no longer responses to control inputs as would be required by PSM so it throws the Amber light and ABS for extra good measure too.
So put the cats back and enjoy the car instead of whatever you're trying to accomplish without cats.
Error codes were developed to diagnose problems on a stock engine not for the purpose of trouble shooting a modified one, so chances are slim that they are relevant to the actual cause: the missing cats...
@hardtailer
If you're running that rich won't you be washing the cylinders with fuel? If that's the case then oil change ASAP as you figure this out right? Or bore scoring?
yeah I w finally messed around with it a bit today, only codes were MAF hot film and misfires on every cylinder, so I replaced the Maf with a brand new one AGAIN and the code didn�t go away. My only thought is maybe it�s the throttle body sweeps??
