8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHThree Codes At Once: PO102, P0491, P0492
Leading reported evidence
Check intake/vacuum leaks
Suggestion or failed attempt
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 contain suggestions
1
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Suggestion · Original poster
My thought was to first check for vacuum leaks with a smoke test.
Leading evidence: 'Check intake/vacuum leaks' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check intake/vacuum leaks' (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
I agree with Joe, 491 492 are SAI and usually a vaccum leak to the control valves....Visually inspect ande if nothing then smoke test...
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 · Original poster
Does anyone have a silver bullet fix, or recommended investigation steps.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I had the CEL come on yesterday and my Durametric showed the following codes all at once.
- P0102
- P0491
- P0492
I can hear my secondary air pump coming on from time to time, so I don�t think that�s it.
Reading at idle are:
- Hot film MAF: 1.22V
- Mass air flow: 16kg/h
Does anyone have a silver bullet fix, or recommended investigation steps. My thought was to first check for vacuum leaks with a smoke test. Any other approaches?
I would worry about the P0102 code first. It is directly related to the MAF sensor. Pull it and at least clean it first. Has it ever been replaced?
P0491 and P0492 relate to the secondary air injection system. Could be a vacuum leak so a smoke test is a good place to start.
I agree with Joe, 491 492 are SAI and usually a vaccum leak to the control valves....Visually inspect ande if nothing then smoke test...
102 is allways a MAF problem but may not be the MAF its self.....Could be a vaccum leak post-MAF or a vario-cam solenoid shorting causing low voltage on the 12v power wire to the MAF....
Skip - given that weird intermittent ticking sound I described (the one that speeds up and slows down regardless of RPMs), which you said could be a solenoid of some sort, could these two things be related?
Sorry Scott I don't remember about the ticking noise, can you post it again ?
I get hundreds of questions about problems on different engines and my old brain can't remember them all , especially the ones with no finality or seriousness/catastrophic supposition...
No problem.
Backstory - I had my engine rebuilt (again) after the rings didn't seat. After replacing it and putting a couple hundred break-in miles on it, I noticed a ticking sound coming from behind the rear passenger seat area. It was only audible at idle and the strange thing was it would start at about 100 ticks per minute and then gradually over the next 30 seconds or so increase up to about 180-240 ticks per second, and then slowly start to fall back down. The ticking was NOT in sync with RPMs. If I did rev the engine, the fast ticking would slow down and maybe stay slow for a minute or so, or t might start increasing again. I don't hear it at all the times I come to a stop, but maybe 1/3 of them. I think you said it sounded like a bad solenoid, but I can't remember.
Oh yeah, I remember hearing the Audio now.... its not an engine problem sounded like the fuel tank vent solenoid ...Nothing to do with these codes...
Yes first you fix the vaccum leak on the SAI System and get rid of the 491 492 codes then see whats next...
