Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 09-24-2015, 08:16 PM   #1
Registered User
 
Join Date: May 2013
Location: Orange County, California
Posts: 266
Magnaflow Universal Catalytic Converter

Hi guys,

So the day I fear most has come (almost). My car is taking forever for the Catalyst Readiness monitor to set, and I need it for my upcoming CA smog test. Observing the oxygen sensor voltages, I can see the bank 2 cat is very unresponsive and slowly dying.

Magnaflow has a universal catalytic convert that is CARB approved for this car. Since the second catalytic converter along the exhaust path (right before the muffler) is not monitored by the computer, since there are only two O2 sensors before and after the pre-cat that is integrated into the exhaust header. I was thinking about finding a shop that can cut that second cat out, weld the universal on in place, then make a hole for the oxygen sensor downstream of the univesrsal cat. Then both the pre-cat and the univesal cat are monitored, and hopefully that makes the computer happy enough to set the Catalyst monitor.

What do you guys think? Or am I crazy? Spending $4000 just for emission purposes on a $8000 car just doesn't make sense to me.
hancock1701 is offline   Reply With Quote
Old 09-24-2015, 08:51 PM   #2
98 Arctic silver 986
 
tommy583's Avatar
 
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,214
Garage
Why don't you just buy a used header/cat from Woody or ebay? Then it will still look stock for the California emissions police.
tommy583 is offline   Reply With Quote
Old 09-25-2015, 04:14 PM   #3
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,430
Quote:
Originally Posted by hancock1701 View Post
I was thinking about finding a shop that can cut that second cat out, weld the universal on in place, then make a hole for the oxygen sensor downstream of the univesrsal cat. Then both the pre-cat and the univesal cat are monitored, and hopefully that makes the computer happy enough to set the Catalyst monitor. What do you guys think? Or am I crazy?
I'd suggest a cheap used cat. They will get you thru emissions (worked for me).
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 09-25-2015, 04:44 PM   #4
Registered User
 
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,319
If the cat goes it is almost always the first one, the one monitored. Look up P0430.

Isn't there an obvious modification test to your smog test? Wouldn't a deviation side to side raise concerns? Will the ECU be able to compute the correct AFR with the imbalance? Lots of people have taken their exhausts off and they are just sitting around. Not to mention wrecking yards.
mikefocke is offline   Reply With Quote
Old 09-25-2015, 05:31 PM   #5
Registered User
 
Join Date: May 2013
Location: Orange County, California
Posts: 266
Quote:
Originally Posted by thstone View Post
I'd suggest a cheap used cat. They will get you thru emissions (worked for me).
I haven't had any luck finding those around my area (Orange, CA). I'll keep an eye on eBay and Craigslist.
Quote:
Originally Posted by mikefocke View Post
If the cat goes it is almost always the first one, the one monitored. Look up P0430.

Isn't there an obvious modification test to your smog test? Wouldn't a deviation side to side raise concerns? Will the ECU be able to compute the correct AFR with the imbalance? Lots of people have taken their exhausts off and they are just sitting around. Not to mention wrecking yards.
From my understanding, the ECU only use the upstream O2 sensors to calculate the AFR, so whatever downstream of that is for emissions purposes only. I've been driving the car for the past two months and couple thousand miles, it has not set the codes P0420 or P0430, but will not set the Catalyst monitor either. From what I've read, for my model year 2001, during a smog test, they don't measure the tailpipe anymore, just plug it in and read the Readiness monitors.
hancock1701 is offline   Reply With Quote
Old 09-25-2015, 05:46 PM   #6
Registered User
 
Join Date: May 2013
Location: Orange County, California
Posts: 266
Quote:
Originally Posted by tommy583 View Post
Why don't you just buy a used header/cat from Woody or ebay? Then it will still look stock for the California emissions police.
I'm sorry who is Woody?
hancock1701 is offline   Reply With Quote
Old 09-25-2015, 06:39 PM   #7
98 Arctic silver 986
 
tommy583's Avatar
 
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,214
Garage
He is a member of the forum. His user name is itsnotanova. He has the best used part prices on the internet. I almost can't believe you have never heard of him. He is famous on here
tommy583 is offline   Reply With Quote
Old 09-25-2015, 08:37 PM   #8
Registered User
 
Jager's Avatar
 
Join Date: Jul 2010
Location: California
Posts: 1,809
Garage
If you plan on keeping the car, contact Sunset Porsche for a new catalytic converter... Best price I found. You do not have to do both sides, just the converter that is failing.
__________________
Jäger

300K Mile Club
Jager is offline   Reply With Quote
Old 09-26-2015, 11:10 AM   #9
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,190
Garage
Quote:
Originally Posted by hancock1701 View Post
Hi guys,

So the day I fear most has come (almost). My car is taking forever for the Catalyst Readiness monitor to set, and I need it for my upcoming CA smog test. Observing the oxygen sensor voltages, I can see the bank 2 cat is very unresponsive and slowly dying.

Magnaflow has a universal catalytic convert that is CARB approved for this car. Since the second catalytic converter along the exhaust path (right before the muffler) is not monitored by the computer, since there are only two O2 sensors before and after the pre-cat that is integrated into the exhaust header. I was thinking about finding a shop that can cut that second cat out, weld the universal on in place, then make a hole for the oxygen sensor downstream of the univesrsal cat. Then both the pre-cat and the univesal cat are monitored, and hopefully that makes the computer happy enough to set the Catalyst monitor.

What do you guys think? Or am I crazy? Spending $4000 just for emission purposes on a $8000 car just doesn't make sense to me.
Moving the O2 sensor any further away from the primary (warmup cat) will set the CEL & trouble code for slow warmup of the O2 sensor.
Just get a used part to replace yours.
__________________
2000 S Speed YellowLN 3.6L cylinders & pistons, triple row IMSB upgrade, R&R connecting rods, billet tensioner paddle,oilpump driveshaft.Heads rebuilt by F6I with new valves & springs.Cayman airbox & MAF housing, 996 intake plenum & 75mm T/B. NHP sport converters &Dansk muffler
BYprodriver is offline   Reply With Quote
Old 09-26-2015, 11:15 AM   #10
Registered User
 
thom4782's Avatar
 
Join Date: Sep 2010
Location: Foster City CA
Posts: 1,080
So long as your car doesn't have any codes (CEL on or stored) and your emissions system is 'ready' for monitoring, you should pass CA's test. IIRC, CA no longer does a tailpipe test for cars newer than '98. Mine was in this situation and passed with flying colors. BTW: They did do a manual inspection of the system to see if the right equipment was still there.

It's a violation to install a used catalytic converter in CA. That's why it's hard to find a shop willing to do the work or to find one for sale in the junk yards.

If you want to buy a new genuine Porsche one, ECS Tuning sells them on their website. I paid $1675 delivered a couple of months ago for Bank 2 exhaust / converter manifold. Bought it because I was sick of seeing the CEL come on. The other Bank is even cheaper.
thom4782 is offline   Reply With Quote
Old 09-26-2015, 11:27 AM   #11
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,190
Garage
[QUOTE=thom4782;467783]So long as your car doesn't have any codes (CEL on or stored) and your emissions system is 'ready' for monitoring, you should pass CA's test. IIRC, CA no longer does a tailpipe test for cars newer than '98. Mine was in this situation and passed with flying colors. BTW: They did do a manual inspection of the system to see if the right equipment was still there.


In CA 2000 & newer cars are tested via the OBD2 connector for system readiness codes.

Same year warmup cats located as close to the exhaust ports as possible became mandatory.
__________________
2000 S Speed YellowLN 3.6L cylinders & pistons, triple row IMSB upgrade, R&R connecting rods, billet tensioner paddle,oilpump driveshaft.Heads rebuilt by F6I with new valves & springs.Cayman airbox & MAF housing, 996 intake plenum & 75mm T/B. NHP sport converters &Dansk muffler
BYprodriver is offline   Reply With Quote
Old 09-26-2015, 11:38 AM   #12
Registered User
 
Join Date: Dec 2014
Location: Pasadena
Posts: 252
i too have to deal with Commiefornia smog police and they are really cracking down on these aftermarket converters. Be aware what you are buying if you go aftermarket as they look for the approved stamp on these. Went through this crap with a toyota recently that stated Carb approved but in reality there is a Calif only Carb approved too. Make sure it's the Ca and not the 49 state Carb. It is true the sniffer machine has gone away now being replaced by newer system that I believe plugs into OBD2 port. I would drive the car after clearing all codes till all the readiness codes are met. Also Calif allows 1 or 2 readiness codes to not be met depending on your year.
Lapister is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 02:11 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page