Yesterday my SES light came on - no symptoms indicating anything is wrong. So I went out and bought a scanner to diagnose the problem. Error code P0420 - "catalyst efficiency below threshold - bank 1". I have an appointment on Monday for it to be fixed - assume it is warranty work. I would love to fix it myself but don't know what else to do to narrow down the problem. I assume maybe it is one of the O2 sensors? Probably after the cat?
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Silver 02 WS-6, 6 speed, Corsa cat-back, SLP lid, K&N filter, BMR STB, !CAGs, Lou's short stick, MSD wires, MTI "Hammer" cam, ASP underdrive pulley, Hooker LTs, Hooker ORY, Comp 918s, TR pushrods, UMI Sfcs, UMI LCAs, NGK TR55s, Hotchkis springs
Dyno'd 4/24: 330.9 RWHP/ 344.8 RWTQ (Before cam, headers, and pulley)
Dyno'd 5/1: 383.5 RWHP / 380.5 RWTQ (393 actual RWHP) -
Most likely either fouled contacts on the sensor or it's a little lazy and on it's way out.
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You would have to watch the O2 on the scanner and see what its doing.96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there
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Could be the sensor, wiring, or the cat. To check, swap the after-cat O2 sensors side-to-side. If the problem stays on the driver's side, its a cat or a wiring problem, if the problem follows the sensor (code changes to P0430), its a sensor problem.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 motorComment
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Thanks guys - I am going to try what Injuneer suggested. I am just trying to learn to do my own stuff. I have always wanted to know how to tear into my own car - I really enjoy it but unfortunately do not know much. But you have to start somewhere right???Silver 02 WS-6, 6 speed, Corsa cat-back, SLP lid, K&N filter, BMR STB, !CAGs, Lou's short stick, MSD wires, MTI "Hammer" cam, ASP underdrive pulley, Hooker LTs, Hooker ORY, Comp 918s, TR pushrods, UMI Sfcs, UMI LCAs, NGK TR55s, Hotchkis springs
Dyno'd 4/24: 330.9 RWHP/ 344.8 RWTQ (Before cam, headers, and pulley)
Dyno'd 5/1: 383.5 RWHP / 380.5 RWTQ (393 actual RWHP)Comment
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