5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCam plugs popping out
Leading reported evidence
Replace breather elbow
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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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Replace breather elbow' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check crankcase pressure' (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 performed work without a confirmed outcome
1
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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 replaced the cam plugs and drove around town for several days and then it pops out.
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
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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
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Suggestion
Can you use a manometer to check the crankcase pressure?
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Suggestion · Original poster
Here is what I do know: I have not replaced the valve cover gaskets (I heard that gasket sealer can block the passage ways and cause excessive pressure in the crank case and pop out cam plugs), I did replace the AOS about 20,000 miles ago.
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Suggestion · Original poster
Here is what I do know: I have not replaced the valve cover gaskets (I heard that gasket sealer can block the passage ways and cause excessive pressure in the crank case and pop out cam plugs), I did replace the AOS about 20,000 miles ago.
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Suggestion
They had a good maintenance program and would refresh their engines after X amount of hours in their engine shop, or sometimes if they didn't have an engine ready they would just buy one from our parts department and swap it.They had a stable of about 10 cars in various classes and would use our shop after hours and work all night prepping, ( sometimes sleeping the the 18 wheelers during the daytime).
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.
5 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: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I'm looking for some help here! I have a 2002 996, cab, tip, C4, 105,000 miles and recently I keep blowing out cam plugs. Then oil drips down on the exhaust and smokes. Here is what I do know: I have not replaced the valve cover gaskets (I heard that gasket sealer can block the passage ways and cause excessive pressure in the crank case and pop out cam plugs), I did replace the AOS about 20,000 miles ago. I recently replaced the breather elbow. No engine lights on. I replaced the cam plugs and drove around town for several days and then it pops out. Replaced it and it lasted several weeks, then out of know where, pops out. I have had 3 pop out and cannot figure out why.
I might be wrong, but I have heard the AOS can cause this. However, my thinking would be a failed AOS causes vacuum, not pressure in the crank case. Again, I might be totally wrong on this.
Any help would be appreciated!
Thanks again everyone, Greg
Additional information: It's the larger brown cam plug, not smaller green plugs. Initially the driver side blew out. Since then, three times and all three times, the passenger side.
Can you use a manometer to check the crankcase pressure? I really hope you don't have positive pressure in your crankcase.
There are no oil passages around the big brown plug so the only explanation is positive crankcase pressure.
A little bit too much blow-by will cause the big brown cam plugs to pop out. Do a compression test and leak down test to determine if the ring seal is a bit low.
The TRG Race Teams had a stable of cars running in the GrandAm circuit that used to come to our shop the week before the Porsche 250 to prep their cars for the race at Barbers Motorsports. They had the same problem with the big brown cam plugs popping out. They had a good maintenance program and would refresh their engines after X amount of hours in their engine shop, or sometimes if they didn't have an engine ready they would just buy one from our parts department and swap it.They had a stable of about 10 cars in various classes and would use our shop after hours and work all night prepping, ( sometimes sleeping the the 18 wheelers during the daytime).
To keep the big brown cam plugs from blowing out, even on new engines , they had an aluminum plate made to bolt across the plug to retain it. Also used a bit of glue to help hold it in.
Because the brown plug is a lot bigger diameter, it is much easier for a small amount of pressure to blow it out as compared to the green ones.
This is a source reference. Confirm exact model applicability in the original material.
