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Discussion summary
YOUR RESEARCHHow to tell if my 1999 has the original engine
Reported or suspected cause
ground
Reported cause
No successful repair reported for this finding.
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Identified cause
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Suspected cause
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Reported fixes
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 report identifying a cause
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.
Reported cause
Turned out to be a bad ground from the battery to the body of the car.
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Suggestion
Projekt EPiK, To obtain your COA you must download the paperwork from the PCA, fill it out, send it off with a check for about $100, and wait a month or so.
Leading evidence: 'ground' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'ground' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check about $100, and wait a month or so' (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
The original engine may have been one of the defective castings that was replaced early in life.
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 suspect a cause
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Suspected cause
If the engine serial number isn't on the certificate of authenticity from Porsche, I suspect the closest you can come is determining that it is not a replacement serial number engine (no AT after the engine type on the stamped serial number on the case), and that the serial number of the engine falls within the serial number range for your model (as listed on the screen print by DBJoe996).
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
Projekt EPiK, To obtain your COA you must download the paperwork from the PCA, fill it out, send it off with a check for about $100, and wait a month or so.
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
You can ask in a dealer, if they want, they can check the engine number associated to the VIN number, and even the Transmission number.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check about $100, and wait a month or so
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
Projekt EPiK, To obtain your COA you must download the paperwork from the PCA, fill it out, send it off with a check for about $100, and wait a month or so.
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.
Suspected cause
If the engine serial number isn't on the certificate of authenticity from Porsche, I suspect the closest you can come is determining that it is not a replacement serial number engine (no AT after the engine type on the stamped serial number on the case), and that the serial number of the engine falls within the serial number range for your model (as listed on the screen print by DBJoe996).
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.
30 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: 20261027T161234Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
At almost 182k miles, and no record of engine replacement on Carfax I'm trying to determine if my m96 is in fact the original engine. I have pics of the engine block #s, how do you match it to the chassis? I just did an oil change last weekend and pulled the pan to take a look.. super clean and zero shavings in the pan or the oil filter so I'm feeling pretty good about it, but I just need to know if she is truly a survivor.
Thanks
What is the build date (month and year)?
There were some faulty engine cases on the 99s that required engine replacement early in life.
Getting the Porsche certificate for your car may be the only way to tell for sure.
Actually, I don't think Porsche kept any records of a specific engine # matched to a VIN or chassis number. Not like the older 911's advertised as "numbers matching" engine and chassis. About the best you can do is check your engine number (M96/01 XXXXXXXXX) and as long as there is not an AT, it is probably original and not a replacement engine. Even if you go to PCA and order the COA, it will not list a specific engine number.
Here is some help
You will need to crawl under your 911 and look at the serial number on the drivers side of case. If, like mine, your S/N
has an X instead of a W in the middle of the numerical sequence you have a rebuilt replacement engine.
My car is a 1999 996 with a 2004 rebuilt engine. Single row IMS bearing, upgraded drive chain.
jumpy chunky, I think the X is a part of the year code. 66X is a 1999.
AT is the serial number code for engines that are factory replacement engines. "AT" designates remanufactured or Austauschmotor.
If the engine serial number isn't on the certificate of authenticity from Porsche, I suspect the closest you can come is determining that it is not a replacement serial number engine (no AT after the engine type on the stamped serial number on the case), and that the serial number of the engine falls within the serial number range for your model (as listed on the screen print by DBJoe996).
Yes they do.
You can ask in a dealer, if they want, they can check the engine number associated to the VIN number, and even the Transmission number.
If not, the "official" way to do it is requesting a Porsche Certificate of Authenticity.
I've never seen a COA for a 996. Does anybody have one and does it actually show the specific original engine number with serial number? I might just order one for my car just to see.
I dont have a COA neither.
What I can ensure you is that, in the porsche CRM, you can check all the information of the 996 cars associated to the VIN. Options, engine number, transmission code, etc. Dealers have access to that information so I guess the COA should provide it also.
I now realize that my 3/98 build likely has a replacement engine. The original engine may have been one of the defective castings that was replaced early in life. Probably late 1998 or 1999. I have the original owners/service manual and there is nothing recorded in there about the engine being replaced. I remembered the serial number as 15xx, but it is actually 15,xxx. Not as low as I thought.
so my engine is 7088 built? I need to get a COA. How do I go about that?
This changes my plan for the car now.. going to preserve from modding the engine further til 200k, then she gets a full refresh with headers and a tune. I've got a Tail of the Dragon trip coming up in 2 weeks so the miles will go on quick.. love driving this car. So impressed with the power at this age. Will be amazing with a fresh engine and a tune, and she deserves it. These cars can be whatever you want them to be so easily.
I have the COA for my car also. It shows the engine number and transmission number and also the "type" for each (e.g. "M96/04" for engine and "G96/00" for transmission).
Projekt EPiK, To obtain your COA you must download the paperwork from the PCA, fill it out, send it off with a check for about $100, and wait a month or so.
I have the Certificate Of Authenticity (COA) from PCNA for my '99,It shows engine number. FWIW: Porsche keeps records on just about everything. For removal of doubt, order the COA.
relnuca
The sealant was from installation of an X51 baffle. I had concerns when I saw the sealant after I purchased the car. When I recently installed the 2 quart sump, I discovered it already had an X51 baffle. The car was purchased in April 1998 by Michelin Research and Development from Brumos Porsche in Florida. It has Euro GT3 seats, wheel studs, single jacking points for lifting one side of the car with one jack, the X51 baffle, and it had a full roll cage that was removed prior to the car being sold to the second owner. It came from the factory with few options other than the Sport Package with M030, limited slip, and traction control (222 and 224). The engine was super clean when I opened it up.
I should add that the bits in the pan we're all plastic pieces from the chain guides. No metal. The car had 42k miles in 2014 when the second owner bought it and 89k when I bought it in early 2017. The second owner had a 90 mile round trip commute on I85 in SC and he racked up some miles. I bought it after he gave up trying to fix an electrical issue. Turned out to be a bad ground from the battery to the body of the car. The bad ground killed two alternators.
There were two small pieces of sealant on the pick up tube screen, but fortunately, not enough to affect the flow rate. This is why folks like Flat6 caution against using too much sealant.
If you are willing to pay shipping out to the 50th State, I will send it to you. Knowing me, it would sit on a shelf for years and I would never do anything with it.
I got it from the garage at my other house and found the box the new one came in. I will be out of town and will not have a chance to ship it for a week.
