Thread: catalytic converter repair?

Page 1 of 2 12 LastLast
Results 1 to 20 of 29
  1. #1 catalytic converter repair? 
    SE Level Member
    Join Date
    Sep 2008
    Location
    nowhere
    Posts
    7
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    got another code the other day, autozone said its for my catalytic converter. so I am wondering a few things, is this something i can replace by myself if I get a vehicle specific cat (as I'm terrified of the cost)? and is there a possibility that there could be something else wrong, hopefully less expensive, causing the computer to think the cat is having a problem?
    Reply With Quote  
     

  2. #2 Re: catalytic converter repair? 
    Turbo is the way to go. BillBoost37's Avatar
    Join Date
    Jul 2009
    Location
    W Spfld
    Posts
    26,815
    Thanks (Received)
    53
    Likes (Received)
    90
    Dislikes (Received)
    1
    It would help greatly if you could supply the code and the year/model of your car along with any mods you might have.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
    Reply With Quote  
     

  3. #3 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    It may be cheaper to find somone selling their bolt in downpipe with high flow cat. Get it for $150 or under shipped and usually can get it bolted in yourself or a shop for around $50 and get the extra performance/flow.
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

  4. #4 Re: catalytic converter repair? 
    GTX Level Member tayl5645's Avatar
    Join Date
    Jul 2010
    Location
    Michigan
    Posts
    1,022
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Infact therwe is someone selling one now in the for sale section believe it was a 3" catted DP bolt on for 150 IIRC
    2005 GTP Grey

    Custom built Open cone intake, 15% tints all the way around, 7" touchscreen DVD player
    Reply With Quote  
     

  5. #5 Re: catalytic converter repair? 
    SE Level Member
    Join Date
    Sep 2008
    Location
    nowhere
    Posts
    7
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    i believe it is the P0420 code (will confirm after work) and is completely stock...and these high flow cats, will they still allow me to pass emissions? i live in massachusetts
    also its an 02 gt
    Reply With Quote  
     

  6. #6 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Most of our car have no issue with the high flow cats. I think its the 04+ cars that sotimes shoot codes. Not 100% on that tho your gonna have to have somones confirm that. Im cattless and Im just going to get the codes deleted so emissions wont matter.
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

  7. #7 Re: catalytic converter repair? 
    Turbo is the way to go. BillBoost37's Avatar
    Join Date
    Jul 2009
    Location
    W Spfld
    Posts
    26,815
    Thanks (Received)
    53
    Likes (Received)
    90
    Dislikes (Received)
    1
    GM put stricter parameters into the pcm's starting in 2000. A high flow cat with typically cause a code. If you have a universal or high flow cat, that's likely what is causing the P420 which is an inefficient cat code.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
    Reply With Quote  
     

  8. #8 Re: catalytic converter repair? 
    Turbo is the way to go. BillBoost37's Avatar
    Join Date
    Jul 2009
    Location
    W Spfld
    Posts
    26,815
    Thanks (Received)
    53
    Likes (Received)
    90
    Dislikes (Received)
    1
    BTW, where in mass are you?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
    Reply With Quote  
     

  9. #9 Re: catalytic converter repair? 
    SE Level Member
    Join Date
    Sep 2008
    Location
    nowhere
    Posts
    7
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    around lowell. you from the area?

    i believe i have a universal cat, i bought the car with about 120k and the guy before me had a cat replaced at sullivan tire (repair was about $900!!!). i believe in mass they stick something over the exhaust to test emissions, so a high flow cat wont cause any problems with this?

    -also guys thanks for all the help and quick replys, it is greatly appreciated
    Reply With Quote  
     

  10. #10 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by BillBoost37 View Post
    GM put stricter parameters into the pcm's starting in 2000. A high flow cat with typically cause a code. If you have a universal or high flow cat, that's likely what is causing the P420 which is an inefficient cat code.
    Thanks for clearing that up man. $900 for a new cat is retarded tho. Buy a cat from rockauto.com and have a general exhaust shop weld it in if you dont want to go the high flow route
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

  11. #11 Re: catalytic converter repair? 
    SE Level Member
    Join Date
    Sep 2008
    Location
    nowhere
    Posts
    7
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    I would love to get a highflow cat (to hopefully increase performance a bit?), i just wonder if those pass emissions here in mass. i believe they test the actual emissions and not just the computer codes, can anyone confirm this?
    Reply With Quote  
     

  12. #12 Re: catalytic converter repair? 
    The Blue One blueguy's Avatar
    Join Date
    Jun 2008
    Location
    Dirtyzville, Missery
    Posts
    31,287
    Thanks (Received)
    1
    Likes (Received)
    2
    Dislikes (Received)
    0
    If you want to increase performance at the same time as keeping the car legal to pass emissions...ZZPerformance sells some pretty decently priced catted downpipes, that are larger than stock...gets rid of the factory u-bend as well...which is HORRIBLY restrictive...and have cats that don't fail...or any that I have seen for that matter. Most any cars after '01 have issues with the SES light tripping because of HF'ing converters...but I don't believe ZZP's trip the SES. If your worried moreso about the SES light being on over a tailpipe test...then get a rear o2 simulator...that plugs into the rear o2 sensor and tells the PCM your cat is there and in working order...they are like 30 or 40 bucks.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
    Reply With Quote  
     

  13. #13 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by bluegtp91 View Post
    If you want to increase performance at the same time as keeping the car legal to pass emissions...ZZPerformance sells some pretty decently priced catted downpipes, that are larger than stock...gets rid of the factory u-bend as well...which is HORRIBLY restrictive...and have cats that don't fail...or any that I have seen for that matter. Most any cars after '01 have issues with the SES light tripping because of HF'ing converters...but I don't believe ZZP's trip the SES. If your worried moreso about the SES light being on over a tailpipe test...then get a rear o2 simulator...that plugs into the rear o2 sensor and tells the PCM your cat is there and in working order...they are like 30 or 40 bucks.
    Always get a tune too and get that code deleted. Even more umph. Still need the downpipe tho. and there around 150-200 just dont get ZZPs Tuned PCM there downpips are great tho
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

  14. #14 Re: catalytic converter repair? 
    The Blue One blueguy's Avatar
    Join Date
    Jun 2008
    Location
    Dirtyzville, Missery
    Posts
    31,287
    Thanks (Received)
    1
    Likes (Received)
    2
    Dislikes (Received)
    0
    Tune really isn't going to do much...the extra "oomph" your feeling is the higher rev limit, no speed limiter, and skip shifts removed.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
    Reply With Quote  
     

  15. #15 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by bluegtp91 View Post
    Tune really isn't going to do much...the extra "oomph" your feeling is the higher rev limit, no speed limiter, and skip shifts removed.
    How so? More timing also. Or are you getting at the fact that he wont really have many mods with the tune? I have a open cone, 3" dp and PLOG. Are you saying I wont see to much difference then?? I know you know your s^!t soooo. Im staying stock pulley more timing per your advice. So how would him getting a tune be any difference than me?
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

  16. #16 Re: catalytic converter repair? 
    Turbo is the way to go. BillBoost37's Avatar
    Join Date
    Jul 2009
    Location
    W Spfld
    Posts
    26,815
    Thanks (Received)
    53
    Likes (Received)
    90
    Dislikes (Received)
    1
    I'm pretty sure they don't tailpipe test. Because there's a lot of guys sliding through on reprogrammed pcms. I'll ask though.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
    Reply With Quote  
     

  17. #17 Re: catalytic converter repair? 
    The Blue One blueguy's Avatar
    Join Date
    Jun 2008
    Location
    Dirtyzville, Missery
    Posts
    31,287
    Thanks (Received)
    1
    Likes (Received)
    2
    Dislikes (Received)
    0
    Quote Originally Posted by chevyy1212 View Post
    How so? More timing also. Or are you getting at the fact that he wont really have many mods with the tune? I have a open cone, 3" dp and PLOG. Are you saying I wont see to much difference then?? I know you know your s^!t soooo. Im staying stock pulley more timing per your advice. So how would him getting a tune be any difference than me?
    Your boosted.

    This guy is not.

    Also...most box tunes don't screw with timing that much anymore from what I've seen. Stock is 16*...most companies are just removing some TQ management...richening up fuel tables...changing shift points, transmission line pressure, fan turn on points, and skip shifts(40mph kick down to 1st vs. 2nd gear)...the less stuff changed in the box tunes, the better IMO...every car is different and tuning needs to be tailored to each car specifically...while an aftermarket PCM is a nice upgrade...it isn't really a HP/TQ gainer...it just changes some factory parameters that suck.

    Also...your right...you'll still notice a difference, but my GT just has an open cone and a few other odds and ends...and I have a DHP Tune in it...didn't really make much of a difference other than the higher shift points and lower temps like I stated. If I were the OP...I'd get a bolt-in 3" catted downpipe and be done with it.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
    Reply With Quote  
     

  18. #18 Re: catalytic converter repair? 
    SE Level Member
    Join Date
    Sep 2008
    Location
    nowhere
    Posts
    7
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    alright i like what you guys are telling me! looks like i can turn this negative into a positive. so say i order a cat converter and ubend delete from zzperformance, i then just go to a local exhaust shop and have them weld it on for me??
    Reply With Quote  
     

  19. #19 Re: catalytic converter repair? 
    The Blue One blueguy's Avatar
    Join Date
    Jun 2008
    Location
    Dirtyzville, Missery
    Posts
    31,287
    Thanks (Received)
    1
    Likes (Received)
    2
    Dislikes (Received)
    0
    Quote Originally Posted by madore9 View Post
    alright i like what you guys are telling me! looks like i can turn this negative into a positive. so say i order a cat converter and ubend delete from zzperformance, i then just go to a local exhaust shop and have them weld it on for me??
    Here ya go...
    http://zzperformance.com/grand_prix/...=551&catid=110

    3" bolt-in WITH a cat...$189.99 + S&H.

    To have an exhaust shop bolt it in for you...probably 20-40 bucks...I wouldn't pay more than that.

    Worthwhile upgrade too...as you'll notice gains not only in performance, but MPG's as well.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
    Reply With Quote  
     

  20. #20 Re: catalytic converter repair? 
    GTP Level Member chevyy1212's Avatar
    Join Date
    Oct 2008
    Location
    IL
    Posts
    974
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by bluegtp91 View Post
    Your boosted.

    This guy is not.

    Also...most box tunes don't screw with timing that much anymore from what I've seen. Stock is 16*...most companies are just removing some TQ management...richening up fuel tables...changing shift points, transmission line pressure, fan turn on points, and skip shifts(40mph kick down to 1st vs. 2nd gear)...the less stuff changed in the box tunes, the better IMO...every car is different and tuning needs to be tailored to each car specifically...while an aftermarket PCM is a nice upgrade...it isn't really a HP/TQ gainer...it just changes some factory parameters that suck.

    Also...your right...you'll still notice a difference, but my GT just has an open cone and a few other odds and ends...and I have a DHP Tune in it...didn't really make much of a difference other than the higher shift points and lower temps like I stated. If I were the OP...I'd get a bolt-in 3" catted downpipe and be done with it.
    Oh well.. You win again lol. Im gettin a custom tune anyway no box tune so hopfully my timing will be higher. As for the OP I didnt realize he wasnt boosted so that kills qwite a bit on my end. I just shot the tune out there as another option to the O2 eliminator even tho it is more. Since he is N/A tho shouldnt he go with the 2.5" DP?
    1998 GS with Open cone, PLOG, ZZP Catless DP, tune & Intense MPS 3.6. Pulls good enough to make the woman smack me and call me a D!*k.
    Reply With Quote  
     

Page 1 of 2 12 LastLast

Similar Threads

  1. catalytic converter
    By mmerrittjr in forum Introductions/Noob Questions
    Replies: 9
    Last Post: 02-16-2011, 11:49 PM
  2. catalytic converter
    By c002529 in forum General Tech Discussion
    Replies: 10
    Last Post: 10-07-2010, 11:45 AM
  3. Catalytic Converter
    By LonelyLoser45 in forum General Tech Discussion
    Replies: 1
    Last Post: 04-17-2009, 12:24 PM
  4. I need to no were i can get a catalytic converter.
    By krazyog1 in forum General Tech Discussion
    Replies: 1
    Last Post: 03-03-2009, 02:00 PM
  5. Catalytic converter?
    By GTP4 in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 8
    Last Post: 12-09-2008, 07:56 PM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •