no cats

Discussion of the 5.7L-6.1L-6.4L HEMIs.

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hp+

no cats

Post by hp+ » Sun Dec 21, 2003 1:28 am

Does having no cats , send the pcm into protection mode and richin the fuel mixture.I do know it brings up an engine light,I suppose to show an o2 fault.Ihave an 03 hemi which we took the stock exhaust out and ran dual exhaust with no cats.It really breaths now,Iam in the process of tricking the pcm to thinking it still has cats.does anyone have input on this.

mnc2886
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Joined: Wed Jul 23, 2003 6:47 pm

Post by mnc2886 » Wed Dec 24, 2003 1:58 pm

Use O2 sensor simulators. They trick the pcm into thinking you have functional cats. They can be found all over the place. They usually run about $90.

hp+

o2 sensor

Post by hp+ » Thu Dec 25, 2003 7:19 pm

I bought o2 emulator from caspers,a it does not seem to work.I can't really go to dealer to scan it. And nobody else but dealer has softwear for the 03s.

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