05-23-2021, 07:56 PM | #29 | |
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06-17-2021, 12:11 AM | #30 | |
Drives: 2010 - RS V6 - LLT Join Date: Jun 2021
Location: okc
Posts: 6
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I've had this code off and on since I got the new engine. So Doorman 42009 (18mm) for an LLT, correct? I saw another post that said 14mm I think, which wouldn't be 42009.
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I got 99 problems...and my LLT IS one
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06-17-2021, 02:55 PM | #31 |
Drives: 2014 Camaro 2SS Join Date: Feb 2015
Location: Metro Detroit
Posts: 492
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Exhaust leaks, even very small ones upstream from the O2's can also cause this.
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03-22-2022, 10:31 AM | #32 |
Drives: 13 CAMARO 2SS LS3-04 SILVERADO LS3 Join Date: Dec 2021
Location: SOUTHERN MARYLAND
Posts: 802
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I see tons of misinformation on this thread. Quickly, without conducting a seminar this is how it works. On a V8 you have 4 heated O2 sensors. The pre cat sensors are strictly for fuel delivery. The post cat sensors are catalyst monitoring sensors....that is their only job. They work by creating a voltage and the range is around 100mv-800mv. Key on engine off the normal voltage is 450mv. Engine running the primary O2's will fluctuate between 100-800mv but generally average 450mv between the high and low. Once the converter is at operating temperature and doing what it's supposed to the post O2's will read very close to 450mv and fluctuate very little. Now when the catalyst isn't functioning the post O2's will mirror what the primary O2 reads. This is how the ECM knows the cat is either missing or degraded. The reason the anti fouler may work is because it pulls the sensing element of the O2 out of the exhaust stream. Other than turning on the light, running the car with a bad cat will not cause any problem to the car as long as it's not restricted.
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03-23-2022, 08:18 AM | #33 | |
Drives: 2011 SS-RS Join Date: May 2011
Location: FLORIDA
Posts: 11,765
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TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.
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03-25-2022, 01:55 PM | #34 |
Drives: 13 CAMARO 2SS LS3-04 SILVERADO LS3 Join Date: Dec 2021
Location: SOUTHERN MARYLAND
Posts: 802
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So, taking this to the next level, you might ask yourself.....Why do the primary O2's fluctuate? Rich lean rich lean back and forth. It would seem so simple just to keep the air/fuel ratio constant like a carburetor does. 14.7 to 1 is ideal for combustion. Converters need oxygen to do their job, at 14.7 there isn't enough oxygen for them to accomplish that. So remember back to 70's and 80's cars with air pumps. They injected fresh air directly to the converter. Solenoids and the computer would decide when and how long they would deliver air. Engineers learned that if they just toggle the fuel mixture from rich to lean and average 14.7 to one they could eliminate the need for the air pump and still provide the catalyst with the required oxygen. We still see some air pumps on some cars but they are only there to help the converter "light off" on cold start up. So this fuel strategy of toggling of fuel also enabled for catalyst monitoring. Rich lean rich lean going in, steady coming out...that's how we know our converter is working.
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03-25-2022, 05:41 PM | #35 | |
Drives: 2011 SS-RS Join Date: May 2011
Location: FLORIDA
Posts: 11,765
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__________________
TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.
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