25 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOur cars get ruined by...
Reported or suspected cause
catalytic convertor
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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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 report identifying a cause
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Reported cause · Original poster
At CoG I asked Chris about a rattling noise I was getting - it turned out to be the Catalytic Convertor.
Leading evidence: 'catalytic convertor' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'catalytic convertor' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust timing and mixture (doubt it' (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.
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
Wishing I never got involved with ruddy paramount - car is just filled with problems now.
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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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
Adaptive ECU's usually use inputs from the O2 sensor and the knock sensor to adjust timing and mixture (doubt it uses EGT).
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Suggestion
I would suggest getting a diagnostic check done to see if any fault codes are present.
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Suggestion · Original poster
One thing to mention though - after coming in from a blast tonight (after seeing your post I decided to see what it could do!), I bounced off of the rev limiter for about a second and during that time the Engine Check light came on and stayed on for another second after I changed gear then went off.
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
One thing to mention though - after coming in from a blast tonight (after seeing your post I decided to see what it could do!), I bounced off of the rev limiter for about a second and during that time the Engine Check light came on and stayed on for another second after I changed gear then went off.
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.
25 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 1 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
From what I understand, our 996s, in most cases, have their performance down-graded by the ECUs ability to 'learn' different settings for the car. Am I right in thinking that this Revo stuff can erase that and load on a performance map every time it is plugged in?
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The DME will adapt it's fuelling settings over a period of time, depending on the conditions, fuel quality, etc. On cars with eGas (like your C4) it is a simple process to reset these adaption values to the factory default setting. Simply switch on the ignition for 60 seconds, but do not start the car or touch the throttle pedal. Then switch the ignition off for at least 10 seconds. Job done.
I don't know, but I would assume that the DME would adapt the values of the Revo map in the same way. Why not ask Revo?
Hi Richard, could you tell me whether my 2002 C2 has the egas system please? I bought my car 2nd hand and wondered whether it might be sensible to reset to factory settings so that it can adapt to my local conditions, fuel quality etc. Any advice would be appreciated.
Humm
Adaptive ECU's usually use inputs from the O2 sensor and the knock sensor to adjust timing and mixture (doubt it uses EGT). The mixture is usually only used in closed loop at part throttle, so should not have a big effect on full throttle power. The knock sensor input often causes the ECU to retard much more agressively than it will supsequently advance.
Reseting your ECU may reset retarded timing and improve the performance, but if its been knocked back, then its done it for a reason and will soon do it again (unless caused by a bad batch of fuel).
On my previous turbo car, I put 95 after running it on 98 for a few months, I hit knock at high revs/full throttle and the sudden dip in performance was very noticable.
While the ECU is adaptive, I would not be frequently resetting it, but trying to work out why its retarding in the first place.
I'd never reset it since I got the car. It was probably because of the previous owner being just under 70. It's most likely that the car only got 95 RON fuel and pretty much never got driven hard. It made sense to reset the EM to get used to the higher octane fuel (98), the new induction and the high flow mufflers.
Richard - are there any signs of an engine on it's way out? I'm very paranoid about it blowing up, as I have heard of many stories of failed 996 engines. I just feel like I can't take it to the limit. Should I be worried?
There are two things which generally cause 996 engine catastrophies. A cracked cylinder liner, or a failed intermediate shaft/bearing. A cracked liner can often show up before total failure with a water/oil intermix. An IMS failure tends to give you a large clatter a second or two before the hand grenade inside the engine goes off.
These problems are RARE, and get blown out of proportion by internet forums. I am not in denial that they exist, and there are no confirmed figures, but I believe the percentages are low. In the 5 years I have been a member of this forum, I am can only remember one IMS failure (poor Rob Kellock) and no cylinder liner failures. However, there have been dozens of posts from people worrying about the problems.
Go on to any American forum, such as RennTech or Rennlist, and you'll find quite a few failure reports. But remember that they sold tens of thousands more 996's in the US than the UK. How many reports will you see that say "my car is wonderful, and I've never had a problem"? Precious few. People tend to join forums and rant at failures than praise the lack of.
I just heard that my old C2, which I sold with 85,000 miles on the clock, has turned 105,000 and still going strong. The owner bought it as a second (4th actually) car, but loves it so much he drives it all the time.
If it worries you to the point of not enjoying full use of the car, I would suggest a decent warranty, or get rid of it!!
Sounds good to me, I was having thoughts it may have been blown out of porportion by forums...
Thinking about it, if there is just a few complaints out of the tens of thousands of 996s out there, it's got to be rare. One thing to mention though - after coming in from a blast tonight (after seeing your post I decided to see what it could do!), I bounced off of the rev limiter for about a second and during that time the Engine Check light came on and stayed on for another second after I changed gear then went off. Normal I assume?
Cheers
Paul
Ah, one more thing!
At CoG I asked Chris about a rattling noise I was getting - it turned out to be the Catalytic Convertor. Out of genuine kindness he gave me two new ones that he just happened to have off of another 996 while he was there for absolutely nothing! Now
that's
what you call customer service!
They appear to be a slightly different shape to the current ones on the car so I am convinced they are MkII ones.
Will MkII 996 Cats fit on an MkI 996?
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Any direction on how to fit them? Could it be another DIY job or would you reccommend getting it done at a garage?
Cheers
Paul
1998 and 1999 C2's have mechanical throttle, so are not reset the same as an eGas car. The only way to reset the adaption values is to disconnect the battery for a couple of minutes. Don't forget to turn the ignition key to position 1 before disconnecting the negative terminal, otherwise the alarm siren will go off.
