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Post cat air flow sensor

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Posted · Report post

Hi Guys

Did a search but can't seem to find anyone with the same issue. I'm running the motordyne tdx2 exhaust with berk cats. When I first installed the exhaust, there was an noticeable increase in power. I never got a proper tune but the battery was unplugged during install. As the exhaust settled over the next few months, it got a little louder and then a gradual loss in performance. I noticed that some of the bolts needed to be re-tightened which explains the noise but when I took out the post cat air sensors, they were completely black and looked clogged with exhaust powder. I cleaned the sensors and put the stock cats and exhaust back on and the car feels a lot faster. Car never showed any fault signals.

I'm not sure if this is normal with HFC's. I was considering getting the motordyne resonated test pipes but I'm now worried that the sensors will get dirty even quicker. I assume the sensors are detecting less 02 and therefore less fuel going in and reducing performance. Is this correct? Is it normal for this to occur with HFC's and test pipes?

Any help would be appreciated.

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Posted · Report post

Hey mate, 

When I put my HFC and I nvidia exhaust on, my engine light was coming on due to running too rich. I suspect it's the same as issue as yours if your sensors are going black, but not to the extent for your engine light to come on. I'd definitely recommend getting it tuned. 

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