Help - Smog question
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Freshman User
Joined: Nov 2006
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Help - Smog question
Hey everyone, new to the site. I just picked up a 95 F150 2wd with a 302 EFI...I have been hearing a loud rattling/ticking noise after the engine warms up but only at 2,500rpm's or so and lower. I got underneath the truck last night and found what it was. The truck has true dual exhaust with no converters so whoever did the exhaust left the air tube just sitting there hooked to nothing. That is definetley the source of the noise I have been hearing...my question is what is the best method for fixing this? The smog pump obviously isn't needed as there is no converter(s) on the truck so should I get a short belt and bypass the pump? If I do this then what hose(s) to I need to plug or remove, or can I just leave everything where it is? Any advice appreciated....
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Freshman User
Joined: Nov 2006
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I found the relay that must control the valve that directs the air from the heads to the exhaust and I unplugged it. That stopped my noise and the air from coming out of the exhaust air tube. I will assume that this will re-direct the air to constantly flow into the heads. Any problems with running like this? There was a second relay next to this one I unplugged that didn't seem to do anything when I unplugged it.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
The easiest solution is to just remove the section of hard tubing that feeds the cat and leave the rest of the plumbing in place. The cleanest solution is to remove all the plumbing and the pump and cap the vacuum lines. You can however leave the air pump in place an an idler, you won't have to find another belt, and the pump will not affect the engine's performance. If you do remove all the plumbing be sure to cap the holes in the back of the cylinder heads where the air injection tube was.
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TexasGuy001
1987 - 1996 F150 & Larger F-Series Trucks
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Feb 25, 2005 06:28 AM
