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#131616 - 04/23/07 12:36 PM Engine code with ZZP downpipe
Wesley'sGTP Offline
Member
Registered: 06/30/06
Posts: 161
Loc: Mount Clemens, Michigan
I put the ZZP 3" DP in last week.

I got a P0420 code about 2 days later.

i got the 304 stainless with high flow cat.

im guessing the code is from the high flow cat, but i thought i would be able to run it without a code

any thoughts/suggestions
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#131617 - 04/23/07 02:45 PM Re: Engine code with ZZP downpipe
HercMan(Rob) Offline
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Registered: 09/12/03
Posts: 14035
Loc: Fort Worth, Texas
Did you re-use your old sensor? If so you probably damaged it. Very common.
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#131618 - 04/23/07 03:07 PM Re: Engine code with ZZP downpipe
UMfan Offline
Member
Registered: 08/09/03
Posts: 3256
Loc: Oregon
Yeah, it should run just fine with that high flow cat. Mine ran just fine.

But I've heard of cases where people damage that rear O2 sensor during install.
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#131619 - 04/23/07 09:09 PM Re: Engine code with ZZP downpipe
gteisele Offline
Member
Registered: 08/27/06
Posts: 1333
Loc: New Jersey
yea time for a new one its like 10 bucs
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(99 GT),K&N 9" intake,ZZP HV TB(68mm), ZZP PCM,ZZP front powerlog, HV3 intake manifold spacer, 3" DP to SLP exhaust,Comp Cam 801 and springs, MSD ignition,Voltage Booster,black housing headlights with HID kit and halos
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#131620 - 04/24/07 08:56 AM Re: Engine code with ZZP downpipe
D Offline
Member
Registered: 03/02/06
Posts: 1059
Loc: Brooklyn, NY
10 bucks for an o2 senor, were do you get them. WHen I put a new one in mine it was $56.00 which was a Denso.
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---Ray Dawson---

1997 Grand Prix GT: ZZP SS M90 Kit--P&P Blower and LIM--3.8" Modular pulley--36# injectors--ZZP Wizair CAI--8.5mm MSD Wires--Autolite 103s@ .052--180* drilled T-stat--Tune Time Performance Tune--ZZP 2.5" D/P w/o Cat--ZZP Stage 1 HV TB--ZZP Power Log & Rear PEM--ZZP Poly Motor & Tranny Mounts--Flowmaster 40 Series Delta Flow Mufflers--Auto Meter Z Series Boost & Oil Pressure Gauges--Aeroforce Interceptor Scan Gauge

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#131621 - 04/24/07 02:38 PM Re: Engine code with ZZP downpipe
zuulmusic Offline
Member
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
I was very careful with my sensor and I set the same 420 code with my hi-flow cat. After researching the issue, multiple sources told me it was because of the hi-flow cat. The computer's sensitivity for that is pretty high. I had the car emissions checked (long story for why they sniffed the exhuast instead of OBD2-ing it), and my car passed with flying colors, even with the 3" downpipe and hi-flow cat.
$10 says your new O2 sensor will give you the same code over time smile
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#131622 - 04/24/07 02:57 PM Re: Engine code with ZZP downpipe
ordonez1307 Offline
Member
Registered: 04/18/05
Posts: 8901
Loc: Bradenton, FL
just get the 02 simulator.
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#131623 - 04/24/07 03:49 PM Re: Engine code with ZZP downpipe
Wesley'sGTP Offline
Member
Registered: 06/30/06
Posts: 161
Loc: Mount Clemens, Michigan
maaan, i wish i would've gotten the offroad pipe, im gonna have to get a simulator anyway! lol
zuulmusic, did you just end up with a simulator then?
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#131624 - 04/24/07 04:11 PM Re: Engine code with ZZP downpipe
zuulmusic Offline
Member
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
No I disabled the code with the power tuner.
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#131625 - 04/24/07 05:30 PM Re: Engine code with ZZP downpipe
UMfan Offline
Member
Registered: 08/09/03
Posts: 3256
Loc: Oregon
Quote:
Originally posted by zuulmusic:
I was very careful with my sensor and I set the same 420 code with my hi-flow cat. After researching the issue, multiple sources told me it was because of the hi-flow cat. The computer's sensitivity for that is pretty high. I had the car emissions checked (long story for why they sniffed the exhuast instead of OBD2-ing it), and my car passed with flying colors, even with the 3" downpipe and hi-flow cat.
$10 says your new O2 sensor will give you the same code over time smile
I've been driving with my 3"dp and high flow cat for a year now. Never thrown a code.
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#131626 - 04/24/07 10:39 PM Re: Engine code with ZZP downpipe
Wesley'sGTP Offline
Member
Registered: 06/30/06
Posts: 161
Loc: Mount Clemens, Michigan
from the ZZP website:

"The 304 works so well, that we can place the rear O2 bung in the 3” section of the downpipe on our 304 pipes. Trying that on our aluminized or competitor’s 409 pipes has produced check engine lights triggering “Catalyst system low efficiency”. By placing the O2 in the 3” instead of the 2.5” section of the pipe, we increase the HP gains."


i have the 304, maybe thats my problem and what they claim is wrong and throwing a code? or do you guys that are problem free have the 304?
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#131627 - 04/24/07 11:35 PM Re: Engine code with ZZP downpipe
zuulmusic Offline
Member
Registered: 04/22/05
Posts: 3075
Loc: Cleveland, OH
maybe my hi-flow cat is actually super mega hi flow.
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#131628 - 04/25/07 01:54 AM Re: Engine code with ZZP downpipe
UMfan Offline
Member
Registered: 08/09/03
Posts: 3256
Loc: Oregon
Quote:
Originally posted by Wesley'sGTP:
from the ZZP website:

"The 304 works so well, that we can place the rear O2 bung in the 3” section of the downpipe on our 304 pipes. Trying that on our aluminized or competitor’s 409 pipes has produced check engine lights triggering “Catalyst system low efficiency”. By placing the O2 in the 3” instead of the 2.5” section of the pipe, we increase the HP gains."


i have the 304, maybe thats my problem and what they claim is wrong and throwing a code? or do you guys that are problem free have the 304?
Interesting. I've got a JimmyC downpipe and high flow cat. I thought they were all the same. Maybe not.
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#131629 - 04/25/07 03:46 AM Re: Engine code with ZZP downpipe
Chico Offline
Member
Registered: 02/08/04
Posts: 3463
Loc: Gonzales Tx.
Again if you do'nt have a powertuner a simple $2 100k resistor will eliminate the rear 02 code.Chico.
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#131630 - 04/25/07 01:57 PM Re: Engine code with ZZP downpipe
UMfan Offline
Member
Registered: 08/09/03
Posts: 3256
Loc: Oregon
Quote:
Originally posted by Chico:
Again if you do'nt have a powertuner a simple $2 100k resistor will eliminate the rear 02 code.Chico.
Chico, I might need to go this route to get my headers to work (if I eliminate the cat).

Can you be more specific about what resister to get, and how does it plug into the O2 harness?
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#131631 - 04/25/07 07:13 PM Re: Engine code with ZZP downpipe
Chico Offline
Member
Registered: 02/08/04
Posts: 3463
Loc: Gonzales Tx.
There's a good write up on OQCGP's site Ive been running this system for a couple of years without a problem.Chico.
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