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need advice--- code po430

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  • #1

    need advice--- code po430

    My Camaro threw code PO430--catylast efficency below threshold (bank 2).
    this means my cats are pluged up right? what can i do to fix it? I dont want to get new cats, because as soon as i come up with the money im getting headers and the TSP truedual kit (no cats). it my take me a few months to round up the money to pay for the headers, truedual kit, install, and tune. so what can i do in the mean time? will this hurt anything to drive it as is for the next month or two? I have lost some noticable performance in the righer RPM range.
    --- 2000 NBM A4 Camaro SS #8156 ---
    3,200VIG, B&M 24K super cooler, Coated race style pacesetters , 3" TSP true duals, TSP Clear lid, SLP Smooth bellows, NX wet kit, CFN bottle heater, dyno tune purge, LS1 Edit, Auto meter & ZEX gauges, 160 thermostat, TB Bypass mod, !EGR & !AIR, Madman PHB & LCA's, NITTO 555R's
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  • #2
    It doesn't necessarily mean the cat is plugged up. Simply means that when the PCM looks at the voltage variations from the after-cat O2 sensor on that side, it doesn't see the voltage it is looking for. Could be a cat that is contaminated, and lost its abilitly to chemically alter the content of the exhaust gasses, could be the O2 sensor is faulty.

    You could swap the left and right after-cat sensors to see if the code follows the sensor (faulty sensor) or stay where it was (faulty cat).

    If the cat is actually plugged up, it could seriously reduced power. That could only be determined by having an exhaust shop measure the pressure in the head pipe, in front of the cat.

    To get rid of the code, you could simply install a "O2 simulator" in place of the after-cat O2 sensor. If you are eventually deleting the cats, you would either need to get "sims" or have the after-cat sensors programmed out of the PCM.
    Fred

    381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

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    • #3
      thanks, thats a good idea

      in a strange twist of fate, after the SES light has been on for like 10 days straight. it went off last night and has yet to come back on. i guess i'll see what happens in the next couple of days.
      --- 2000 NBM A4 Camaro SS #8156 ---
      3,200VIG, B&M 24K super cooler, Coated race style pacesetters , 3" TSP true duals, TSP Clear lid, SLP Smooth bellows, NX wet kit, CFN bottle heater, dyno tune purge, LS1 Edit, Auto meter & ZEX gauges, 160 thermostat, TB Bypass mod, !EGR & !AIR, Madman PHB & LCA's, NITTO 555R's

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      • #4
        my SES light came back on this morning. but its ok because i also found out today that the cats are warantied for 8yrs 80,000miles so i called the stealership and told them what was going on. With out any kind of hassel they said to bring it in to be checked out/ fixed at no charge. i have to drop off the car at 7:30am tomarrow.
        --- 2000 NBM A4 Camaro SS #8156 ---
        3,200VIG, B&M 24K super cooler, Coated race style pacesetters , 3" TSP true duals, TSP Clear lid, SLP Smooth bellows, NX wet kit, CFN bottle heater, dyno tune purge, LS1 Edit, Auto meter & ZEX gauges, 160 thermostat, TB Bypass mod, !EGR & !AIR, Madman PHB & LCA's, NITTO 555R's

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