6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSmoke test EVAP - Code P0442
Reported or suspected cause
fist thing i replaced
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Leading evidence: 'fist thing i replaced' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'fist thing i replaced' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Recommend not' (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.
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 performed work without a confirmed outcome
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.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed · Original poster
I have already replaced the gas cap, purge valve near the TB as well as another valve that sits right at the gas tank fill neck.
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
I have a bottle of nitrogen that I use just for EVAP testing.
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
But I recommend not using an air compressor to do the smoke test for EVAP systems.
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 was going to replace the purge valve but figured since it wasn't a problem before let's try easiest/cheapest first so I ordered a Porsche cap (with tether).
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've hooked up my smoke machine before to the TB when testing some of the vacuum system but was curious if there was a different procedure for the EVAP.
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.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Car runs perfectly fine but I want to get this fixed and it seems like the next logical step is to smoke test the EVAP system.
So I've been chasing this annoying code for way too long:
P0442 - Porsche Fault Code 97 - Tank Vent System (Minor Leak)
. I have already replaced the gas cap, purge valve near the TB as well as another valve that sits right at the gas tank fill neck. The code seems to show up whenever it wants. I've gone for weeks not seeing anything and also had it come on every other day. Car runs perfectly fine but I want to get this fixed and it seems like the next logical step is to smoke test the EVAP system. My question is: what is the preferred entry point for the smoke test? I've hooked up my smoke machine before to the TB when testing some of the vacuum system but was curious if there was a different procedure for the EVAP. Appreciate any insights on this!
I normally go through the test port if it exists on the car.
The 996 doesn't have one though, I unhook the purge valve near the TB and go through it.
But I recommend not using an air compressor to do the smoke test for EVAP systems.
It's not recommended to push smoke using oxygen into the fuel tank, especially if the fuel level is low.
I know lots of people do it without any issues, but it's not considered safe, and I won't do it.
I have a bottle of nitrogen that I use just for EVAP testing.
Thanks - I was thinking of going through the purge valve as well as that leads directly to the EVAP system and should be more effective, I think.
I will not be using an air compressor to move the smoke into the engine so safe there but appreciate the warning! I actually have a home made smoke machine that uses a small bike pump to move the smoke so very minimal amount of pressure will be used. Will give this a try soon and hope to find the culprit!
Is your replacement cap a Porsche cap? A few months ago I got distracted while fueling and drove off without the cap (tether broke). I bought a Stant #826 the next day which fit perfectly even making a hiss when removing. I still kept getting the code every ~100mi or so. I was going to replace the purge valve but figured since it wasn't a problem before let's try easiest/cheapest first so I ordered a Porsche cap (with tether). A few k miles now and no codes since. As with many other parts our cars even like genuine Porsche gas caps.
Yes, using a genuine Porsche gas cap. I think the price delta was like $3 between that and other options so just got the real deal. It was the fist thing I replaced but no dice.
