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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Jon87V20 on February 01, 2017, 02:36:49 pm

Title: Does Replacing Exhaust Affect The Computer
Post by: Jon87V20 on February 01, 2017, 02:36:49 pm

I'm replacing all my exhaust. I had to remove the transmission and had to cut out the old exhaust because it was rusted badly. As far as I know, everything about this truck is factory. Does the ECM rely on anything in the exhaust that would cause it to throw a check engine light or mess up the economy if I replace it all with headers and remove the catalytic converter etc.? I don't remember seeing any sensors behind the manifolds.

'87 Suburban V20 with 350ci TH400

Thanks!

Title: Re: Does Replacing Exhaust Affect The Computer
Post by: Captkaos on February 01, 2017, 02:38:35 pm

Depending on the engine it would have an O2 in the exhaust manifold.

Chris Lucas
73-87chevytrucks.com
squarebody.biz

Title: Re: Does Replacing Exhaust Affect The Computer
Post by: Jon87V20 on February 01, 2017, 02:44:03 pm

Is it possible to tap and install this somewhere down the line a bit? Maybe right before the collector ends?

Title: Re: Does Replacing Exhaust Affect The Computer
Post by: VileZambonie on February 01, 2017, 03:59:33 pm

You can buy headers with an O2 bung or install your own O2 bung in the collector.

Title: Re: Does Replacing Exhaust Affect The Computer
Post by: bd on February 01, 2017, 04:14:20 pm

If the headers don't have an O₂ sensor bung already, the factory sensor monitors the left cylinder bank (odd numbered cylinders) and needs to be as close to the cylinder head as possible, exposed to exhaust flow as it exits the cylinders, to maximize heat and minimize registration delay.  Mounting in the header's collector is an appropriate location.  Mount the sensor so that it hangs down into the collector from above to prevent any possibility for water condensate to contaminate the sensor.  Liquid water destroys O₂ sensors.