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What is this and why does it blow hot air

398 Views 12 Replies 8 Participants Last post by  BigBlue 94

So next to my battery and starter solenoid, there is a box on top of the classic ford coffee can blowing out hot air, with a smell of unburned hydro carbons. Wondering if This needs to be capped of or removed entirely if I am not using it. I live in SC. No inspections of vehicles.
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It's a vent for the smog system that use to have a flexible aluminum tube that went out the hole right there in the metal inner support for the fender.
Its the muffler for the smog system, and ive never seen it have a tube on the outboard end. On 100s of these trucks.

The plastic "coffee can" is the air inlet filter. The metal coffee can is a vacuum reservoir. The black box below the battery is the charcoal canister and it traps fuel vapors from the tank, and releases them into the intake when under load.
My 95 has it maybe it’s a 94-96 thing
I got my 94 in 2003 with 72k miles and there was no sign of one.
I’m talking about the plastic tube that goes towards the radiator
Thats the inlet for the air filter for the smog pump. Thought you were talking about a tube from the smog pump muffler.
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