08-16-2014, 01:40 PM
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#1
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Uh, maybe it IS the O2 sensor...
Thought I'd swap over my O2 sensors to check if there was a problem with one. Pulled off first post cat. Hmm, think I found the problem. 😏 
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-16-2014, 08:18 PM
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#2
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Registered User
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,665
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wow looks like the shield was burned/melted right off.
What symptoms were you seeing? O2 codes? Rough running?
I think I need to pull mine and check that as well.
__________________
"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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08-17-2014, 04:30 AM
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#3
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Actually, it ran just fine. Had a CEL and the code was a p0430, which signals a bad cat ( or maybe a sensor that is toast). Also the Durametric readings for pre and post cat were both in roller coaster mode.
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-17-2014, 08:39 AM
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#4
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Registered User
Join Date: Jul 2010
Location: California
Posts: 1,859
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How many miles on this O2 sensor?
__________________
Jäger
300K Mile Club
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08-17-2014, 08:45 AM
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#5
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Don't know really. The car has 85k miles on it but I've only had it for a year or so. The O2 on bank 1 is clean.
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-17-2014, 12:57 PM
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#6
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Congrat's! Its always nice to find the exact cause of the problem on the first try!
I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach. 
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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08-17-2014, 04:23 PM
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#7
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Registered User
Join Date: Apr 2011
Location: florida
Posts: 487
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Quote:
Originally Posted by thstone
Congrat's! Its always nice to find the exact cause of the problem on the first try!
I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach. |
Too funny. Sounds like someone I know!
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08-18-2014, 06:07 AM
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#8
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Yep, sometimes they do get fouled. Now for the next big question: Why did that bank get so fouled with oil??
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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08-18-2014, 08:39 AM
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#9
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Actually, it is not really fouled with oil. The outer shell is broken/corroded/missing and is coated with carbon deposits. The inner sensor is faking off as well. Could be the result of the massive air leak due to a broken oil filler tube and the resulting backfiring and other small explosions that I heard. All fixed now. We'll see...
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-18-2014, 08:44 AM
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#10
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by NewArt
Actually, it is not really fouled with oil. The outer shell is broken/corroded/missing and is coated with carbon deposits. The inner sensor is faking off as well. Could be the result of the massive air leak due to a broken oil filler tube and the resulting backfiring and other small explosions that I heard. All fixed now. We'll see...
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Those heavy carbon deposits look like excess burned oil in the exhaust to me... but I could be wrong.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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08-18-2014, 08:51 AM
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#11
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by NewArt
Actually, it ran just fine. Had a CEL and the code was a p0430, which signals a bad cat ( or maybe a sensor that is toast). Also the Durametric readings for pre and post cat were both in roller coaster mode.
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Is that a oem or Bosche O2 ?
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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08-18-2014, 08:53 AM
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#12
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by thstone
Congrat's! Its always nice to find the exact cause of the problem on the first try!
I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach. |
Not to mention a guaranteed performance improvement for your money spent!
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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08-20-2014, 08:45 AM
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#13
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Quote:
Originally Posted by Topless
Those heavy carbon deposits look like excess burned oil in the exhaust to me... but I could be wrong.
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Yes, you are probably right. I have replaced the sensor but the readings still indicate a cat problem. Marbe I'll try a smoke test on the exhaust to check for leaks. I changed the AOS in the spring and the MAF is fairly new as well. Hopefully it's not really the cat. Major $ !
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-20-2014, 09:10 AM
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#14
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Registered User
Join Date: Apr 2013
Location: Saratoga, NY
Posts: 172
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If you end up needing a cat or cats I happen to know a guy that has both cats from my donor engine
__________________
2001 Boxster S 6speed- weekend warrior
2015 Explorer Sport- New DD
2011 Taurus SHO- Sold
2010 CBR1000RR- Sold
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08-20-2014, 02:07 PM
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#15
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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Hopefully I won't need them ( it ). All 4 cats ?
Sent from my iPhone using Tapatalk
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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08-20-2014, 03:40 PM
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#16
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by NewArt
Yes, you are probably right. I have replaced the sensor but the readings still indicate a cat problem. Marbe I'll try a smoke test on the exhaust to check for leaks. I changed the AOS in the spring and the MAF is fairly new as well. Hopefully it's not really the cat. Major $ !
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Maybe pull and compare spark plugs on both banks. If one side is heavily carboned, you know there is oil in the combustion chamber.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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09-20-2014, 06:01 PM
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#17
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Artist, 986S tinkerer
Join Date: Aug 2013
Location: Montreal, Canada
Posts: 1,821
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so I bought a used cat on eBay for 120 bucks. Install no sweat. Running for a week and no codes yet. Probably too early to tell (touch wood) but my SAI codes haven't come back either. Wouldn't that be lovely!
__________________
James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow!
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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09-21-2014, 07:16 PM
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#18
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Registered User
Join Date: Aug 2014
Location: California
Posts: 37
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Quote:
Originally Posted by NewArt
so I bought a used cat on eBay for 120 bucks. Install no sweat. Running for a week and no codes yet. Probably too early to tell (touch wood) but my SAI codes haven't come back either. Wouldn't that be lovely! |
Congrats 
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