Emissions light on dash lit
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Emissions light on dash lit
The emissions light on the dash of my 86 F-150, 302, is lit. Code reader gave me a 122 (throttle position sensor voltage too low) I hooked up a volt meter and it reads .92 volts and when I push down the accellerator it goes up but comes back down to 1 volt with accellerator held down. Should I tyry to adjust the TPS to proper voltage or just replace it? Also, I adjusted the idle a couple of times before I found out you are not supposed to adjust it. Does adjusting the idle cause a problem with the TPS?? My dash light did not come on for several weeks after I adjusted the idle. The truck runs fine, just has a light on the dash.
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From: Sarnia, Ontario, CANADA!
That light is just a reminder light. In your owner's manual there is a way to reset it. It comes on every once in a while as a reminder to check over your emissions equipment. It was was just convenient that you had a code stored in your memory at the same time.
-Matt
-Matt
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From: Beachville, Ontario
You're pretty addicted to FTE aren't you Matt? Posting so early in the morning.... 
Anyway, you're saying the emissions light is just a reminder to check emissions equipment and doesn't work as a check engine light to signal that there are codes? Do these trucks have a check engine light anywhere?
Anyway, you're saying the emissions light is just a reminder to check emissions equipment and doesn't work as a check engine light to signal that there are codes? Do these trucks have a check engine light anywhere?
Last edited by loudfords; Jul 6, 2005 at 11:23 AM.
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"emission" light says that its time to check out emissions system. Doesn't mean a fault of any kind. Pulling the bulb works I guess. But you actually suppose to reset the module. The module is under the dash, just to the left of steering column. Once you find it, it should have a hole in the side with a sticker that says"reset" (sticker may have fallen off). Find something that fits in the hole. While the reset button is depressed turn ignition to run, wait 5 sec.'s, then release reset. Should have done it.
Post Fiend
Joined: Mar 2003
Posts: 14,413
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From: Sarnia, Ontario, CANADA!
Originally Posted by loudfords
You're pretty addicted to FTE aren't you Matt? Posting so early in the morning....
Anyway, you're saying the emissions light is just a reminder to check emissions equipment and doesn't work as a check engine light to signal that there are codes? Do these trucks have a check engine light anywhere?
Anyway, you're saying the emissions light is just a reminder to check emissions equipment and doesn't work as a check engine light to signal that there are codes? Do these trucks have a check engine light anywhere?
There is not a check engine light on these trucks. I don't think the light comes on the trucks until 87 or 88.
You will just have to check the codes when you think something is wrong or (like I did) every oil change.
-Matt
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