6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHQuestion about specific hoses under the hood
Leading reported evidence
Use smoke machine
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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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
I recently used a smoke machine to test for intake leaks due to high fuel trims.
Leading evidence: 'Use smoke machine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace plastic elbow' (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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Discussions that contain suggestions
1
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Suggestion · Original poster
Also, looks like I need to replace the plastic elbow.
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
I recently used a smoke machine to test for intake leaks due to high fuel trims.
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
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Suggestion · Original poster
I tried to put some smoke down that pipe when testing for intake leak, but I couldn't see the smoke come out anywhere and not even sure where I should be looking.
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
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Suggestion
I have seen people put a little breather filter on the transmission vent hose and eliminate the TB intake hose with one from from a 996 manual or use a silicone intake hose.
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
I tried to put some smoke down that pipe when testing for intake leak, but I couldn't see the smoke come out anywhere and not even sure where I should be looking.
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
I have seen people put a little breather filter on the transmission vent hose and eliminate the TB intake hose with one from from a 996 manual or use a silicone intake hose.
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: 20261026T212127Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have an '02 C4S automatic. I recently used a smoke machine to test for intake leaks due to high fuel trims. I found smoke coming out of the plastic elbow (red arrow). Can anyone tell me where the two pipes from this plastic elbow go? Also, looks like I need to replace the plastic elbow. I believe that the part number is: 99923049840. Can someone confirm that this is correct before I order it. Lastly, I am curious where the small left hose from the rubber intake tube (green arrow) goes. I believe that this is for automatic transmission only, but can't see where ti actually goes. I tried to put some smoke down that pipe when testing for intake leak, but I couldn't see the smoke come out anywhere and not even sure where I should be looking. Thanks
Red arrow = AOS hose
Green arrow = transmission vent line (only automatics have this)
The part number is definitely for the elbow
https://www.pelicanparts.com/More_In...230-498-40-OEM
Might ask when ordering if it includes the two O-rings
Double check your part number here
http://www.autoatlanta.com/porsche-p...section=104-10
DBJoe,
Thanks for the prompt response. Is there a separate part number for the o-ring? I would just buy o-rings instead of the plastic elbow if available. Also, has anyone just replaced this elbow with a rubber 90 degree rubber hose? Seems like would be better then dealing with the o-ring seal.
From the PelicanParts link and picture, it appears to include the O-rings. For $15 I would just get the elbow and move on. Or, pop off the hose and take the O-ring to the hardware store.
Regarding the transmission vent line (green arrow). Seems like a rather strange engineering decision to take air after MAF for this. A leak along the way would allow unmeasured air to come in. Why didn't they just add a nipple to the airbox before the MAF for this, so as to have filtered but pre-MAF air. Seems to me like a more reliable option.
Beats me. I have seen people put a little breather filter on the transmission vent hose and eliminate the TB intake hose with one from from a 996 manual or use a silicone intake hose.
This is a source reference. Confirm exact model applicability in the original material.
