6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHI eliminated my AOS!!!
Leading reported evidence
Run 3/8" vaccum line
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Ran 3/8" vaccum line from the PVC valve to throttle body in place of the factory vent line.
Leading evidence: 'Run 3/8" vaccum line' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace defective pvc valve as i can get' (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 contain suggestions
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Suggestion · Original poster
I don't fear replacing a defective PVC valve as I can get to it from under the car and can replace it without tools.
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
If I rework this, I'll try to use the factory vent line(s)
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 used a PVC valve from an 84 blazer ($2), but should have opted for one with a straight outlet, instead of 90degree elbow.
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.
Pelican Parts: 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: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My AOS failed, causing my 01 996 to smoke badly. After partially dropping the engine I was able to remove the old AOS with LOTS of effort. I was going to install another AOS, but had concerns about the failure rate these seem to have and the difficulty of replacing it without damage. So, here's what I did (hope you find it useful)
1. Cut the top off the old AOS right above the lowest seam (seam from casting). This leaves the remaining AOS as two distinct cavitities with no crossover.
2. Plugged the oil inlet in the AOS with a threaded pipe plug.
3. Cut the bottom ring off of a PVC grommet. (valvecover style grommet)
4. Installed the grommet into the the modified AOS and a PVC valve into the grommet so that it was connected to the cam cover through the modified AOS.
5. This effectively plugs the oil hole in the block, and installs a PVC valve above the driver's side head. I used a PVC valve from an 84 blazer ($2), but should have opted for one with a straight outlet, instead of 90degree elbow.
6. Ran 3/8" vaccum line from the PVC valve to throttle body in place of the factory vent line. If I rework this, I'll try to use the factory vent line(s)
7. Added a valve cover style filter to the vent line on the passenger side. (I would like to add a 2nd PVC valve and T into the vaccum line.
8. Re-routed the coolant lines that go to the AOS together. (bypassing the AOS)
So far so good. No engine light, runs great with no smoke! FYI, I have been an automotive engineer for 13 years and worked through an ABET accredited college as a welding/fabricator then toolmaker/machinist. Can't guarantee the durability yet, but as I said it's worked great for me so far. I don't fear replacing a defective PVC valve as I can get to it from under the car and can replace it without tools. Good luck!
