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Discussion summary
YOUR RESEARCHHelp needed with Porsche 996 engine smoke with fuel smell
Leading reported evidence
Check plugs-ok, borescope-ok, compression-ok
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Performed · outcome unconfirmed · Original poster
When tried to take it to the track recently, I noticed the smoke, checked the plugs-ok, borescope-ok, compression-ok.
Help needed with Porsche 996 engine smoke with fuel smell
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Leading evidence: 'Check plugs-ok, borescope-ok, compression-ok' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel trims' (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
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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
Installed new plugs and oem injectors on the Bank 1, the same thing.
Help needed with Porsche 996 engine smoke with fuel smell
Replace ignition coils
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Performed · outcome unconfirmed · Original poster
Coils has been replaced, spark plugs were not the worst I have seen, some darkening but not a glossy black.
Help needed with Porsche 996 engine smoke with fuel smell
Replace with new (not rebuild) bosch injectors (3)
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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 performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
Injectors just replaced with new (not rebuild) Bosch injectors (3) on the Bank 1 side.
Help needed with Porsche 996 engine smoke with fuel smell
Check fuel trims
Suggestion or failed attempt
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Discussions that contain suggestions
1
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Suggestion
Check the fuel trims using a tool like the Durametric.
Help needed with Porsche 996 engine smoke with fuel smell
Coverage and how to read this overview
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.
11 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: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi 911 fellows, I have 996 engine on a Boxster and can't figure out the reason for the smoke with some fuel smell coming from the Bank 1 of the engine (2003 996). You can see/hear on the video(
https://youtu.be/VAER9S4qejg
) also tapping sound from the exhaust and it does feel like it is pushing exhaust gases out more erratic and not as smooth as other side. Car has not been driven for about 2 years (race car). When tried to take it to the track recently, I noticed the smoke, checked the plugs-ok, borescope-ok, compression-ok.
Installed new plugs and oem injectors on the Bank 1, the same thing. Should I give the "Italian tune up" or may catch on fire?
Check the fuel trims using a tool like the Durametric. This could tell you if the computer is commanding more or less fuel be sent. Do you have any CEL error codes. Are the spark plug coils the originals? If you're smelling fuel in the exhaust I'm surprised one or more spark plugs didn't look wet or black. How is the gas mileage (mpg)? Has it changed recently? Do you smell gas even after the car has sat for awhile (hours) and is not running?
Thanks for the reply. Will try to get fuel ratio with Durametric. No CEL-don't have dash board. Coils has been replaced, spark plugs were not the worst I have seen, some darkening but not a glossy black. The mileage- it is race car, have no idea. Don't smell gas when not driving, just during, mainly when sniffing smoking tailpipe. One thing I noticed, excessive carbon build up on the #2 piston, more than #1 and #3 but the spark plug looked much cleaner on #2. I wonder if it is the reson for uneven exhaust note from that Bank.
Is it possible that the injectors might be stuck open? I bought a used engine that sat for a while and had an injector problem. Had to send them out for cleaning to get them working properly.
Oil in the exhaust isn’t uncommon after sitting for that long. It may take some running to clear up.
Try tapping the injectors while it’s running. If that doesn’t work they may need to be removed and cleaned.
I am just not sure if the car will not catch on fire due to that fuel smell but feel like it may benefit from good hard high RPM drive, at least few minutes on the track.
I'd carry a fire extinguisher.
I think the car would be ok if you're not smelling or seeing gasoline in the engine compartment or underneath the car by the engine, fuel tank, or fuel lines, whether the engine is running or not.
I might do one more thing - on cold engine, run the engine until a minute or so after high idle comes down. Immediately pull the plugs and look for a fuel soaked plug. But even a positive finding won't cause a car fire in my opinion. Maybe just narrow down the source. For a car fire, you need some visible gasoline, coming from a relatively sustained source. You would definitely smell or see something.
Of course, be careful, observant.
Trust your instinct. Don't drive it if you feel it's unsafe. Get an expert opinion.
