19 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHDanger of replacing M96 engine in 2002 Coupe
Leading reported evidence
Install engine
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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 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
Car is is really good condition, except for installed engine.
Leading evidence: 'Install engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check aos also located' (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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Performed · outcome unconfirmed · Original poster
Installed engine has "smoke", when it reaches operating temperature, but nothing at startup and no noise.
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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Performed · outcome unconfirmed · Original poster
AOS has been replaced, but no change in discharge.
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
Check the scavenge pump on bank 1, also check the AOS also located on bank 1, check compression and leakdown.
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
Check the scavenge pump on bank 1, also check the AOS also located on bank 1, check compression and leakdown.
Combined work: Install engine has "smoke" + Replace air oil separator
No successful repair reported for this finding.
0
Reported fixes
1
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report an unsuccessful attempt
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.
Unsuccessful attempt · Original poster
Installed engine has "smoke", when it reaches operating temperature, but nothing at startup and no noise. AOS has been replaced, but no change in discharge.
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
only other thing I can think of would be scavenge pump failure, if the scavenge pump drive breaks off the head will fill with oil and can cause oil to enter the AOS and/or leak past the valve seals.
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.
19 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Need to get opinions/advice on a project. 2002 996 Coupe with Tip, 120k miles and 2003 replacement engine. Car is is really good condition, except for installed engine. Cost for both(car and extra engine) is under $10,000.
Installed engine has "smoke", when it reaches operating temperature, but nothing at startup and no noise. AOS has been replaced, but no change in discharge.
Car ar comes with replacement engine with 70k miles. Plan is to replace the engine, with the engine that comes with the car that has 70k miles on it.
I can do the labor part, that doesn't bother me. What I want to know are what are the possible reasons for the smoke (oil or water), and if that is the cause, what steps would I need to take to mitigate the impact once engine is removed? For example hose replacement (what hoses)?, oil cooler and so on.
There doesn't appear to be water in the oil.
I know this is a wide open topic, and there could be several reasons for what is going on, but is there anything that should scare me off from a cost standpoint, or cause this project to head south with no chance of success?
Buy it
send it to flat six for 3.8L upgraded motor and address all the 28 known failure modes
your will be into it for 35-40k and have a great car worth 20k
Great fun car
Reasons for smoke are numerous. Bore scoring, worn valve seals, residual oil from AOS going back still in the intake manifold.
You have no guarantees about the 2nd engine either. Short of following 996AEs line and sending the engine to be "fortified" by Jake, you are still gambling with same issues on the replacement motor. The health of the replacement motor is not guaranteed either.
You are gambling on the deal. If 2nd motor is no good, you have a roller to sell.
Any details on the car? What color is it? VIN #?
Oh..good call. I forgot to mention. The replacement engine was pulled from a running 911, and verified via video, before the engine was pulled. Naturally, this doesn't guarantee anything not going wrong in the future.
Buy the whole shebang, sell the car with the smoky engine for $10k, sell the known good engine with video for another $10k, then take the $20k and buy a coupe with a stickshift and service records and well under 100k miles for less than $20k. All done and no need to even wash your hands.
Sounds well worth $10,000, but that doesn't mean you won't need to spend another $2,000-$5,000 to get it "right". Search this forum & read all you can.
If you have time to put labour into it and enough space to do so, it seems like a low risk way to spend $10k.
996 rollers are $7-8k on their own these days, so having one potentially bad and one potentially good motor for a bit more seems like a solid deal.
If you want a winter project, have the time, space, tools, and mechanical aptitude, then go for it. Otherwise, Walter's suggestion sounds like a great idea.
Walter's suggestion sounds like a solid "no risk" profit solution. Only thing I will add is on the smoking engine, the possible faults mentioned (bore score,valve seals, AOS) 1. bore score will usually smoke from one side, and usually accompanied by a light tapping noise 2. I have not seen any valve seals fail causing smoke on a m/96 engine 3.AOS failing is VERY likely and common 4. only other thing I can think of would be scavenge pump failure, if the scavenge pump drive breaks off the head will fill with oil and can cause oil to enter the AOS and/or leak past the valve seals. Checking the scavenge pumps is very easy. IF you were able to fix the smoking on the original engine , you will have hit a GRAND SLAM !
i am not quite sure I could sell the car for $10,000, with a bum engine. Nor do I think I can sell an engine for $10,000, that has no warranty. But if that were a viable solution, you would be 100% correct!!!!!
Ok. Little more info in current engine. Blue smoke out of passenger side exhaust (from left bank). No smoke at startup, but ONLY after warming up to operating temperature.
Most at all issue that I have read, with the engine and smoke, point to smoke at startup and then stop or there is noise associated with the issue.
Any thoughts on what might cause this only AFTER getting to temp?
Hard to say without seeing the engine and performing some diagnosis.
For 10K buy the package. You will more then pay for your labor by selling off the worn out motor as a core. Then you have a car you are into for less than 10K. Have some fun with it, sell it, part it out? No matter what, your 10K is well protected.
If you want to sell the smokey engine, let me know. We may be interested in it .
Cheers
Check the scavenge pump on bank 1, also check the AOS also located on bank 1, check compression and leakdown. Make a video and post it. I had a 996 years ago the had started smoking out of passenger side after hot. Customer stated the car had sat in the garage several months for winter storage. Finally found that a chip monk had stored dog food in the exhaust ! I'M SERIOUS !!
If the car runs and just smokes a bit after warmup it's at least an $8k car all day long. Plenty of people out there that are sure it's just an AOS or that they can diagnose is correctly after they buy it.
The replacement engine with relatively low mileage and a video supporting that it ran when pulled should also get at least $8k. Someone out there blew an engine and can't afford a Raby rebuild and doesn't want to sell a roller for 15k less than it was worth a week ago and has a whole winter to install the engine and that's who will buy it... But I still think that if you put both on ebay and start them at 8k each they will go for over 10k each as long as you spread the word in the forums about the auctions....
But the other comment about selling the smoky engine as a core is a good one too if you have the time, space, tools, and inclination to pull engine A and install engine B. You'll make a big chunk of your money back.
