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Discussion summary
YOUR RESEARCHDielectric grease on spark plugs?
Leading reported evidence
Check air-oil separator and the diaphragm seemed fine
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Performed · outcome unconfirmed
I checked the Air-Oil separator and the diaphragm seemed fine.
Leading evidence: 'Check air-oil separator and the diaphragm seemed fine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check air-oil separator and the diaphragm seemed fine' (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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Check on all the cylinders everything it within spec
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Suggestion
The car drove fine for the first couple hundred miles then I got a misfire code for cylinder 8 I pulled the plug and it was fouled bad other spark plugs looked fine, did a compression check on all the cylinders everything it within spec.
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Suggestion
rzmnco, did you ever figure out your issues, my #4 and #8 plugs a more fouled than the rest, and its running a bit rough.
Check on all the cylinders everything it within spec
No successful repair reported for this finding.
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Reported fixes
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Read evidence and context
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
The car drove fine for the first couple hundred miles then I got a misfire code for cylinder 8 I pulled the plug and it was fouled bad other spark plugs looked fine, did a compression check on all the cylinders everything it within spec.
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9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Going to change out my spark plugs and wondering what the consensus is on dielectric grease? From what I've read Porsche doesn't recommend using it but I've read that many in general have had no complaints. Anyone with experience on a 996 can chime in on this issue? Thank you in advance.
I just bought the car from a dealer earlier this month (no warranty/my loss **** happens) with 55,000 miles on it.
The car drove fine for the first couple hundred miles then I got a misfire code for cylinder 8 I pulled the plug and it was fouled bad other spark plugs looked fine, did a compression check on all the cylinders everything it within spec. I checked the Air-Oil separator and the diaphragm seemed fine. Kinda stumped right now.
Any help/ideas would be greatly appreciated.
Worst comes to worse if anyone knows of any good shops in the Baltimore, MD area would be great.
I'd go with what Porsche recommends, no grease. I've never heard of anyone having issues with the connection from the coil to the plug (once they have snapped on completely).
No grease but with that said I find myself dabbing a bit of anti seize by habit sometime. I figure if it's gonna be in there for the next 75-100k, it can only help on the next extraction attempt.
The metals used in the new spark plugs aren't suppose to corrode like the old ones hence the reason why you don't need to apply anything.
I thought my diaphragm was ok too until further and much closer inspection. It had a hairline split that was barely noticeable. Lifted off manifold cover and intake valves were a horror story of sludge. I bought the car like this, unfortunately. Discovered 4 valves weren't seating. Cleaned intake valves as best I could. Installed a $14 oil can separator and within 2 weeks 2 valves re-seated themselves. The suction is crazy on these engines, but that's why they are so powerful.
rzmnco, did you ever figure out your issues, my #4 and #8 plugs a more fouled than the rest, and its running a bit rough.
Curious what the vacuum should be on the 4.5 and 4.8 turbos?
