27 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHReman engines
Leading reported evidence
Replace i've been curious about why the 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
I've been curious about why the engine was changed.
Leading evidence: 'Replace i've been curious about why the engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'sound' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check cam deviation every year or two' (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
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
The original engine had just under 44K on it when it was changed.
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
When the 996 was the new kid on the block, many engines were replaced due to porous blocks causing various leaks at different places and the infamous rear main seal leak (RMS).
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.
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
The "large IMSB" was starting to be used by Porsche in 2006 in Reman engines.
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 · Original poster
If I do choose to go this route in the interim then the drill would be frequent oil changes, a magnetic drain plug, checking the filter for debris and always getting a used oil analysis to keep tabs on any possible impending failures?
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 · Original poster
If I do choose to go this route in the interim then the drill would be frequent oil changes, a magnetic drain plug, checking the filter for debris and always getting a used oil analysis to keep tabs on any possible impending failures?
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 · Original poster
Two things for certain there: If the P clutch starts sounding like the Duc clutch you've got a real problem and changing a Duc clutch is gonna be a whole lot easier that the P clutch.
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.
27 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I�m the new owner of a 3/98 production 996 and could use some advice from those of you who are pros. The car now has 62K miles and the engine was documented as replaced in July, 2009 at 44K miles by a Porsche dealer with a factory reman engine serial number M96/01AT66X67403 and part number 996-100-996-BX. I have spent several hours digging through posts here about reman engines and trying to determine what IMSB is in this engine and try and put together a maintenance plan going forward. And it seems to be the consensus that it �probably� has the larger diameter 6305 un-serviceable but low failure rate bearing� but without dropping the transmission there is no way to be certain. Since I am new to these engines does this seem to be a valid conclusion to those of you who are in the know? I would prefer to drive it until it needs a clutch and then check and be certain what it has in it but of course I would also prefer the engine not grenade on me. If I do choose to go this route in the interim then the drill would be frequent oil changes, a magnetic drain plug, checking the filter for debris and always getting a used oil analysis to keep tabs on any possible impending failures? And if at clutch time it proves to have the big 6305 bearing then just pull the seal and wait for rebuild time and then do the LM Solution? Thanks for any enlightenment!
Yes, your plan sounds exactly correct.
The "large IMSB" was starting to be used by Porsche in 2006 in Reman engines. ALL 2005 engines would have been depleted before sending out 2006 engines and Porsche doesn't "stock" that many engines, so you can bet a 2009 engine will have the latest.
I agree with your plan. I really wouldn�t worry too much about the engine. It would be pretty bad luck to have a 2nd engine fail.
I would also keep an eye on fuel trims and check cam deviation every year or two.
If you decide to end up replacing items on the engine (such as spark plugs or coil packs), or you have to take the sump plate off for any reason, that would be a good time to have the bores scoped.
Otherwise, enjoy in good health!
. I have one too!!!. Oil is cheap insurance, remember pennzoils original recommendation every 3 months or 3,000 miles. I�m going to do 6 months on mine. Make sure that all the fuel delivery intake is as clean as possible. Some here like to run use sea foam, clean your intake thru the throttle. Run premium gas shell v power, I was also advise to run 100 percent ethanol free. Make sure the air filter is clean, use CRC to clean the MAF, clean the throttle. Use fuel system cleaner in the tank to help with injectors, etc. Definitely get durametric to check your cam deviations . Finally drive the car right away, turn it on drive it, don�t go pass 3,500 4,000 rpm until it has reached operating temp. Enjoy the drive. The more I drive mine the more I love it. Got mine 6 months ago.
Thanks for helping ease my concerns about the new toy. I did schedule a PPI (first P is Post however since a Pre wasn't feasable for this car) next week with a local well regarded Porsche independent shop just to get a good baseline idea of it's mechanical condition. The car is basically 100% stock and original and it came with a huge stack of receipts since it was new showing proper and regular service and care so hopefully we will have a long and happy relationship.
But I do need to do something about the lack of proper sound after turning the key. I have three Ducati's and I am used to actually hearing the engine make glorious noises when it's running.
1. If you want it real loud do the muffler delete. Be careful friend of mine got a ticket for that. The good thing is that you are going to eliminate weight, the factory mufflers weight a ton. 2. You can do the gundo hack to the mufflers, is basically muffler bypass still a little bit goes thru the mufflers. 3. Spend more can do the fister mods mufflers. 4. If it has the factory airbox and you want to keep it looking stock where the resonator is you can install a cap and that changes the sound. 5. The car will sound good with the kn intake system but once the engine gets hot you loose performance due to hotter air., not certain about the EVOMS system the design looks like it could probably be getting colder air. I haven�t heard one with this. 6. You could work on the xpipe. You can see some videos in you tube and that�ll give you and idea on the sound from a bunch of the possibilities. My car came in with fab speed headers and exhaust so I�m super cool with that. My plan would be to do away with cats once it gets to 25 years. You may find out from the Indy that once he looks at the car it may have some mods already done. The factory mufflers tend to rust.
Unforrunately you can�t replicate the Ducati clutch chatter 🙂
My opinion - muffler deletes are THE ****, cheap, save a ton of weight and loud. Check my YT - lots of videos of muffler deletes both on the road and the track.
If there was one thing that rises above the rest as far as compliments for my car, it was the sound with my $180 muffler deletes
Do the muffler delete, unless you are an old. It's not obnoxiously loud as some people here say, the average mustang with exhausts is louder. My primary concern was the drone I had heard others here complaining about, that has not been my experience, What I found is you will get it if you can't keep consistent throttle control, so if you have a shakey foot you might want to reconsider. The last time I got pulled over the officers parting words were "nice exhaust".
if you are still in Houston let me know. I love to see your car. I�m going to the Katy cars and coffee tomorrow and I�ll go to the concourse show at Porsche Houston North on the 19. I have the same system as squirrel. Also recently someone had listed muffler deletes for
$150.
From my drag, track days always listen to surfin with an alien 👽 by Joe Satriani, starting to do the same for my triple digit trips. Still want to hear the stereo, that�s why I don�t wanted as loud.
Same here. I've got the MaxFlos with the Agency Power headers that were on clearance. Sounds great. I do have the IP plenum, 82mm TB, BMC filter as well. All of those add to the sound.
Two things for certain there: If the P clutch starts sounding like the Duc clutch you've got a real problem and changing a Duc clutch is gonna be a whole lot easier that the P clutch. If you're not changing the basket (or pulling off fairings) a Duc clutch takes about half hour and most of that is drinking the "that job's done" beer afterwards.
Not so sure about a muffler delete. I don't want to be "that guy" to my neighbors since I already am pushing my luck with the Ducs. Unless the original mufflers look toasted maybe I'll start with the Gundo if I can find a competent local to do it and see if that satiates my aural desires. I'll ask the Indy guy at the PPI next week and see if he knows anyone since I'm new to this area and I don't have any local contact resources.
Gundo or Fister hack. Not too loud, but sounds good.
Muffler delete annoys the crap out of so many people, depending on where you live, and it can get you ticketed or thrown out of certain track events. To each their own.
Fister or Gundo aren�t so loud, but you can still hear it. If you are after maximum decibels, muffler delete and 200 cell cats. If you want really good sound, not just loud, a good muffler will be better.
You can also perform the �orange cap mod� (intake resonator delete with silicon intake tube). I used a 2� pipe plug for mine. This mod increases the intake sound inside the car, mostly at WOT conditions.
If you do both (intake and exhaust), you might only notice and hear the exhaust.
Not to derail the thread, but a question some of us are puzzling through right now: I have a 3/98 build with a 1999 engine serial number. Is there any credence to what I've read about some early '99s receiving factory replacement engines early on?
When the 996 was the new kid on the block, many engines were replaced due to porous blocks causing various leaks at different places and the infamous rear main seal leak (RMS). That got the ball rolling on the value dropping, then came AOS, IMSB, slipped sleeves, D-chunk, cracked heads, that's about it mechanically.
That's now mine.
I've been curious about why the engine was changed. The notes on the dealer receipt say "customer states car has hesitation related to a misfire?" And "customer states coolant brake fluid and brake lining light came on and then went off after a short while."
The original engine had just under 44K on it when it was changed.
Nice looking 996😎
My doppelg�nger 99 has the Fister exhaust and it sounds great with no drone.
Recently my wife told me the 996 sounds like my old 888SPO (Termignoni exhaust) when she hears me coming down the street.
Hope that helps
Perfect! Listening to internet sound clips has been completely useless to try and determine what I should do about the stock stealth exhaust. But an 888 with a Termi I understand. I'd love to drop 25-30 pounds behind the rear axle (muffler delete) but I don't want the car to be obnoxiously loud so Fister or local mod to my current mufflers is top of the list now. Thanks.
My 02 Cab had the engine replaced in 2013 by Porsche. I had the trans dropped to check clutch, change rear seal and see what IMS I had. I have the unserviceable IMS buts its the larger upgraded one. Oil and filter show no metal. My indy says he has never seen or heard of a failure of the upgraded rebuild. I plan on changing the oil more often and not worrying about IMS failure.
This is a source reference. Confirm exact model applicability in the original material.
