Rear cats

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02-26-2006 | 10:48 PM

054door

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Junior Member

Joined: Jan 2005

Posts: 7

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From: Boynton Beach, Fl.

Rear cats

Anyone get Surgeing Idle when removing rear cats on the 5.4? No check engine codes has to Idle for 2 or 3 min before surging from 600rpm to 900rpm. Is there rear o2 sensors?

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02-27-2006 | 10:44 AM

FATHERFORD

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Joined: Nov 2002

Posts: 3,102

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From: Waco/Houston

So you removed your rear 2 cats and now have surging?

Unless while cutting off the rear cats, you messed up the 02 sensors in front of them somehow, I dont see why/how you are surging.

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