O2 sensor required??
Thread Starter
Heel & Toe
Joined: Apr 2023
Posts: 21
Likes: 0
From: Quebec, Canada
O2 sensor required??
Hello C3 people, i have a manual 81 with sotck engine. The carb has been replaced with Holley street warrior 600 cfm. All the wires to CCC from the original qjet are unplugged.
Since the CCC as no carb info/control, I guess the O2 sensor is no required anymore... Is that right? My o2 sensor has just broken in two pieces and I will replace it by a M18 plug if the sensor is of no use.
Bonus question: How do you remove the spark plug from cyl 3.... Man these plugs are a hassle. Thanks!!
Since the CCC as no carb info/control, I guess the O2 sensor is no required anymore... Is that right? My o2 sensor has just broken in two pieces and I will replace it by a M18 plug if the sensor is of no use.
Bonus question: How do you remove the spark plug from cyl 3.... Man these plugs are a hassle. Thanks!!
Living the Vette life....
Joined: Mar 2018
Posts: 555
Likes: 221
Nope, you do not need the O2 sensor since you changed the carb. It was part of the CCC and worked with your old quadrajet. Did you also change the distributor? The stock computer controlled distributor will not work right either.
Living the Vette life....
Joined: Mar 2018
Posts: 555
Likes: 221
So you still have the original CCC system still connected for the distributor then. When I did mine I replaced the distributor too just so I could get the curve set right. Are you getting a check engine light? I am not sure how the CCC will react to using the CCC distributor but without the CCC carb. Most of us have changed both the carb and the distributor out when we got rid of the CCC system.
Thread Starter
Heel & Toe
Joined: Apr 2023
Posts: 21
Likes: 0
From: Quebec, Canada
Yes, I have the check engine light with these 2 codes : 21 (TPS-throttle position sensor) and 23 (mixture control solenoid). I believe these were info from the qjet. I was planing to change the dist but the car runs good and the advance seems ok to me....
Living the Vette life....
Joined: Mar 2018
Posts: 555
Likes: 221
Yes those two codes are from the carb. I think you would be better off changing the distributor out too and getting one with vacuum advance on it. The stock CCC distributor does not have any vacuum advance for timing on it. The CCC distributor might work but may not be optimal for your timing curve.
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Race Director
Joined: Mar 2017
Posts: 11,947
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From: Virginia
Your timing, and current distributor, are leaving a lot of performance on the table. Email @lars for his timing and HEI papers, and get that sorted.
