27 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 C4S in trouble (bad cat CEL and scary sound)
Reported or suspected cause
their responsiveness
Reported cause
No successful repair reported for this finding.
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Identified cause
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Suspected cause
0
Reported fixes
Read evidence and context
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Reported cause · Original poster
I know this may sound stupid but one of the main reasons I chose Cargraphic was due to their responsiveness to email.
Leading evidence: 'their responsiveness' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'their responsiveness' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace forever' (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.
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Performed · outcome unconfirmed
KrazyK, follow dframe to the next COTA event and your life will be changed forever.
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Performed · outcome unconfirmed
FWIW I am running the 200 cell X-pipe cats from Maxspeed Motorsports (NHP).
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Performed · outcome unconfirmed
I selected them after researching used cats, FWD, and Fabspeed.
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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.
2 acknowledgements have no verified action link; they do not establish a repair result.
So I had a great weekend at the track with PCA last weekend. But on my way home the I saw the CEL light for the first time ever. I flipped on the kiwi wifi while I was on the way home to read the code without stopping. The code was low flow through one of the cats (P0420). Whew!
I was relieved the code wasn't something worse. The car was running perfectly fine on on the highway and through several stoplights so I didn't worry too much.
Anyway, when I got home the car has a terrible sound almost like a diesel engine
It only does it at idle though. I didn't get a chance to really get down and figure out where it was originating because I wanted to shut it off. I don't want to start it up again without having my indy look at it so I'm going to have it towed on a flatbed.
What sucks is this was probably going to be my last DE in the car for a while because I wanted to get a track car. Fearing the worst and hoping for the best
When will you guys learn these are not track/race cars. Hope all is well. Are the converters coming apart inside? The broken chunks of catalyst will rattle like crazy.
Cat could be plugged up and with no back pressure on the one side that is plugged could cause the eninge to run rough. Best to tow it to prevent damage from it not firing properly.
Now would be a great time to change your oil. Start by removing oil filter & check it for excessive metal. If there is none drain oil & look for metallic particles there. (good time to get oil sample for evaluation) If none there install new oil & filter & start engine to see if you still have noise.
I don't have xray vision so I don't know if it is an internal engine problem
If I don't get it on it's way to the indy today I'll take byprodriver's advice and check out the oil filter.
Unless you are prepared to fix the car yourself, or you have a mechanic lined up that can't do his own diagnosis leave the car alone.
Just arrange to get the car flat bedded -- no engine running! -- to your favorite shop. The tech will inspect the oil filter oil and whatever else he believes is necessary to id the cause of the noise.
My WAG is the converter suffered a mechanical failure and that is what you hear rattling around.
But let your tech tell you this.
Oh, just a heads up: converters are covered by an emissions warranty which might or might not be 8 years or 80K miles. So if it is a converter it might be covered under the emissions warranty.
ALL cats take a beating at the track no matter what you drive. Dotframe, 200 cell cats.... trust me on this.
I hope you find a quick resolution whatever the cause.
KrazyK, follow dframe to the next COTA event and your life will be changed forever.
I say CAT....mine went off and it did exactly that. Code and rattle suddenly from the back. I was worried to, but new and problem gone.
Then I needed a new tip
And now a new muffler.
All on drivers side.
Makes me think there must have been some collant leaking down that side before I bought the car!
Keep us posted!
sean
dotframe, that is definitely just the cats. CEL goes on, and there is a death rattle at idle. Thats' the stock cats
. The inner chamber has become dislodged and is now rattling around with the engine exhaust pulses. I used to replace mine almost annually, until I replaced them with sport cats. Not only do the sport cats stand up to track use better than the stock cats, you can also pair them with Porsche sport exhaust and you will get a deliciously sounding rumble at idle and a beautifull roar at full throttle when you exit the apex turn heading down the main straight
.
KrazyK, here's a few videos for you. If you like them, maybe you and I can head out for a weekend at the Circuit of the Americas in Austin and have fun at the newest F1 track!!
Watkins Glen, NY
http://youtu.be/PNM2NZe12kc
BeaveRun, PA
http://youtu.be/sM7GytnWKMc
<iframe width="480" height="360" src="http://www.youtube.com/embed/sM7GytnWKMc" frameborder="0" allowfullscreen></iframe>
Looks like you guys were right, thank god!
I changed the oil and cut open the old filter. Not a trace of any metal, plastic, or anything!
Started up the car and no rattle. As soon as it warmed up a bit the rattle returned. I can sort of agitate it with a rubber mallet.
Looks like I'll be ordering some cats this weekend.
If you are going to continue to track the car, get sport cats, otherwise you will be replacing the OEM one's frequently. There are several available, but I use the Fabspeed one. It has stood up to rigorous track use, straight forward bolt in installation, works with the OEM O2 sensor.
EDIT: Never mind. I just saw your other post. While you're at it, look for sport mufflers. A little more pricey, but you can get the OEM Porsche sport exhaust. The combination of the Fabseed cats and the Porsche sport exhaust is just exhilarating on the track!
So I took the bumper cover and heat shield off and with the car cold (obviously) I started it up and stuck my ear right on the cats. It is definitely the source of the death rattle. Already shopping for a set of sport cats. It looks like Cargraphic has the best price for 200 cell. That is except for some company called NHP which I can't find much detail on.
The Cargraphic aren't x-pipe though. Next in line is FVD x-pipe but I don't think they have any in stock here in the US right now (says 6 days before they ship). Finally Fabspeed is still an option but their website doesn't mention available stock or lead time.
Oh and I already have PSE and am looking forward to the sound of these high flow cats!!
Fabspeed builds them to order. If I could do it over I'd go with the FVD xpipe unless I was going to match the cargraphics with their mufflers. Can't go wrong with either in my opinion.
FWIW I am running the 200 cell X-pipe cats from Maxspeed Motorsports (NHP). I selected them after researching used cats, FWD, and Fabspeed.
I am very happy with the results. The car sounds slightly meaner and seems to rev a little easier. Quality of the parts is excellent and the installation was straightforward. It took a full morning but I took my time and also polished my existing mounting brackets just because the new exhaust looked so shiny :-)
The cats include tapped holes for both oxygen sensor locations so they work without modification for both 2002+ and 99-01 cars.
I have noticed that the engine hesitates a little when cold for the first 30-60 seconds of driving and I think it is related to the reduced backpressure when the fuel management system is still in open-loop mode (but that is just my guess). I assume this would have also occurred with any other 200 cell cat.
I was very impressed with Fabspeed as well but the price (and shipping for me) was a little higher. My guess is they both probably use the same or similar underlying cat.
Some great laps! Btw what's with lotus drivers - had the same thing happen to me this summer - 3 opptys to let me by and no hand signal - marshals eventually had him pit
Just a quick update for anyone searching on the same symptoms.
I got new 200 cell cats from Cargraphic.
The old ones came off really easy and the new ones bolted right up. Only 2 small issues came up. Since the O2 sensor placement is slightly different, I had to re-route one of the cables a bit. Also, on the two pre-cat sensors there is a small bolt that goes in on the bottom side. I forgot to put it in at first and the car was throwing all sorts of new codes (as well as sounding like a pressure cooker) and I just about crapped my pants. Anyway, one of those holes had some bad threads but I got that worked out.
Aside from the threads noted above these cats are extremely well done. The stamp on the cats themselves notes they are actually HJS built specifically for Cargraphic. These sound amazing along with PSE!! Also the car feels like it gained a bit of grunt across the whole RPM band. I think this was probably due to the old cats being a bit clogged more than anything else.
Car is running great with no scary sounds or current or pending codes. Woohoo!
I ordered the cats direct from Cargraphic in Germany and after a slight delay in shipping they got here in 2 days! I know this may sound stupid but one of the main reasons I chose Cargraphic was due to their responsiveness to email. Thomas Schnarr replied to an email within like 30 minutes of sending it. And when the package got hung up in US customs, Cargraphic sent me an email alerting me and I was able to call fedex and get it moving the same day.
