exhaust

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Aug 9, 2006 | 12:24 PM

jonbiz57

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Joined: Aug 2006

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exhaust

I have a 92' Ford F-150 extended cab. It has 234,000 miles on it but is still going strong even with my driving back and forth from mid-Michigan to Chicago every weekend.
My question is this: I was under the truck checking out the exhaust pipes, clamps, etc. and I noticed between the manifold and catalitic (sp.) conventer there is a small opening which appears to previously had a hose of some kind on it (it still had a small clamp on it). Can anyone tell me what this is supposed to connect to? If not do you think I should just close it off? There has been a steady exhaust smell (not real strong) in the cab so I'm thinking this is where it is coming from. Appreciate any input.

Aug 9, 2006 | 01:39 PM

Conanski

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Joined: Jun 2006

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From: Ottawa, Ontario

I'm guessing it is not the O2 sensor because the engine would run bad without it, and that's likely where the air injection is supposed to connect. Your truck would have originally had a belt driven air pump on the lower passenger side of the motor, and there would be some plumbing and a couple valves that direct the air into the back of the heads, down to the cats, or to atmosphere, depending upon a number of parameters. If the pump and associated hardware is gone plug the hole in the exhaust. If the pump and hardware is present and functioning you may want to consider having the hose re-attached. It's purely an emissions thing so it shouldn't affect the engines operations either way.