turning emissions light off
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New User
Joined: Oct 2002
Posts: 8
Likes: 0
From: USA
turning emissions light off
The 87 301 Bronco just passed emissions here a month ago. Now the emissions light is on. I know they are OK (as it passed) and would like to know where to jump to turn it off.
Thankx
Thankx
Mountain Pass
Joined: Oct 2003
Posts: 196
Likes: 0
From: Dallas TX
Just because it passed last month doesn't mean there is something wrong now. Have you run a diagnostic on your trouble codes? Your O2 sensor could have gone out. If it has and you don't fix it, you could messup a valve. If everything is actually fine just disconnect your positive battery cable for 10 seconds to reset the computer.
Remember don't just ignore the emissions light just because it passed a month ago.
Remember don't just ignore the emissions light just because it passed a month ago.
Mountain Pass
Joined: Oct 2003
Posts: 196
Likes: 0
From: Dallas TX
Actually they will tell you how to do it, but I don't think they will do it for you. Do you have a haynes manual? In there it tells you how to use a analog voltage meter, it is actually pretty cool. If you do not have a meter, Wlamart has them dirt cheap and Autozone may also.
Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
Likes: 0
From: Round Rock, TX
AutoZone will pull OBDII codes, but they won't pull other codes. Here's Steve83's guide on how to pull the codes yourself with a paperclip:
https://www.ford-trucks.com/forums/s...hreadid=112293
It's pretty straightforward and won't take you but about five minutes.
https://www.ford-trucks.com/forums/s...hreadid=112293
It's pretty straightforward and won't take you but about five minutes.
Senior User
Joined: Jul 2002
Posts: 234
Likes: 0
From: mpls Usa
I had a 87' with the 302 and had the emiss light come on at about 120000 miles had it checked out by a local tune up chain and was told there was nothing wrong and that the mfgr had it set up to trip the light about every 60000 miles to get folks to get folks to check out their rides. sure enough, it did it again at 180000 miles......
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Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
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From: Round Rock, TX
On an Isuzu truck we used to have you had to remove the cluster and move a screw from one hole to the other at 90k miles to turn off the 02 light. At 180k miles, you just move the screw back to the original hole...
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Senior User
Joined: Mar 2003
Posts: 132
Likes: 0
From: OHIO
it is set to come on every sixty thou.take off the cover to get to the fuses.if you are sitting in the truck straight up from your right ankle there is a box with a quarter inch hole take a small screw driver push in the button turn on the key hold for five seconds an let go light should turn off. i believe the box is brown.just did my 87 a month ago.
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Guys, whether the computer triggers the light to come on at some particular interval through normal programming cycles or not, the fact remains that ignoring the light or just clearing the codes doesn't FIX the problem IF there is one. So, pulling the codes when the light does come on is always a good idea. In the long run, it sure beats replacing something that fails like oh...lets see...maybe an engine! The process detailed in the Haynes manual can be simplified down even further and codes can be gotten with a paperclip and your eyeballs. Hardly seems worth the possibility of some small problem (that could easily be rectified) turning into something lifethreatening for the truck, to NOT check it just because we assume we know more than the computer. It doesn't take that long and for my money, (which I happen to enjoy keeping), its worth the time that one does spend.
Senior User
Joined: Mar 2003
Posts: 132
Likes: 0
From: OHIO
i'd bet money that if he has the codes pulled from the comp. there isn't any.emission light is not the check engine light.if dissconnect the brown box in question the truck runs fine acts fine and no codes.
Cross-Country
Joined: May 2002
Posts: 65
Likes: 0
From: Spokane US
87/351W - Automatically triggered by mileage
My 87 did this just a few months ago. Not a thing wrong emissions-wise, just time to reset the light. You can check into your emissions system all you want and verify it's still working as advertised, or reset the light. Your choice.
