What controls the Emissions light?
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Elder User
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What controls the Emissions light?
What is the "Emissions" light hooked too? I'm just curious.
I have no emissions equipment whatsoever, and there was no bulb in the Emissions light. Not knowing what it was, I put one in. It came on when I first turned the key on, then went off, so I thought nothing of it. Then a few days ago it came on and stayed on. Curious, IMO...
I'm really just curious what it hooks too, what makes it light up, etc. I would think it'd hook to the smog pump setup somehow, but I have seen no wires in my engine bay that are unused, I'd have noticed when I did the engine swap.
I have no emissions equipment whatsoever, and there was no bulb in the Emissions light. Not knowing what it was, I put one in. It came on when I first turned the key on, then went off, so I thought nothing of it. Then a few days ago it came on and stayed on. Curious, IMO...
I'm really just curious what it hooks too, what makes it light up, etc. I would think it'd hook to the smog pump setup somehow, but I have seen no wires in my engine bay that are unused, I'd have noticed when I did the engine swap.
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
It's lit up every ~60,000 miles by what Ford calls an Implied Mileage Sensor, the light's
purpose is merely to remind the owner to have the engine serviced (during which time
the sensor is reset).
purpose is merely to remind the owner to have the engine serviced (during which time
the sensor is reset).
Lead Driver
Joined: Jul 2009
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From: Sheffield, AL
Interesting, ctubutis!
My son's 1984 F-150 w/4.9L has 180,000 miles. I purchased it with ~76,000 miles on it. The truck is very much original. The emissions light comes on momentarily at each start-up, but has never stayed on. The Implied Mileage Sensor must not be functioning.
My son's 1984 F-150 w/4.9L has 180,000 miles. I purchased it with ~76,000 miles on it. The truck is very much original. The emissions light comes on momentarily at each start-up, but has never stayed on. The Implied Mileage Sensor must not be functioning.
Post Fiend
Joined: Jul 2004
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From: Northern California
You purchased it when the mileage sensor already went off. 76,000.
Some of the earlier ones in 1984, couldn't be reset and some of the dealers just unplugged it. If I remember rightly. My literature is unclear.
Since 1984 was the first year of it, I would assume you got one of the original ones.
By late 1984/1985 they had a resetable mileage sensor that goes off every 60,000, that you could reset with a pin.
1988 was the first year of an actual working check engine lamp, that was hooked to the computer.
Some of the earlier ones in 1984, couldn't be reset and some of the dealers just unplugged it. If I remember rightly. My literature is unclear.
Since 1984 was the first year of it, I would assume you got one of the original ones.
By late 1984/1985 they had a resetable mileage sensor that goes off every 60,000, that you could reset with a pin.
1988 was the first year of an actual working check engine lamp, that was hooked to the computer.
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Interesting! I remember having a customer with a Dodoge/Chyrsler several years ago that had a non-resetable emissions reminder module I had to replace.... I remember thinking it was a stupid idea!
Anyone know where in the dash it goes? I'd rather reset it than pull the bulb...
I'll go look in my manual too... no mention of it that I ever saw, but I was never looking....
Thanks!
Anyone know where in the dash it goes? I'd rather reset it than pull the bulb...
I'll go look in my manual too... no mention of it that I ever saw, but I was never looking....
Thanks!
Post Fiend
Joined: Jul 2004
Posts: 8,786
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From: Northern California
It's a square or rectangular metal box (could be plastic on some) under the dash. It looks simular to a relay with wires going into it.
If it's never been reset before it will have a piece of tape on it covering the hole.
Just push a pin into the hole to reset.
If it's never been reset before it will have a piece of tape on it covering the hole.
Just push a pin into the hole to reset.
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