Question about 1987 Ford Bronco

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The emission light came on in my 1987 full size bronco, vehicle is running normal.........any ideas?

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  • Ronnie Wilson May 11, 2010

    Tune up Items , 02 sensor if Aplicable, Chrcoal canister wet /w/ Fuel , Air filter

    Check all These Piticulars they are usualy what Causes the emission light to

    be activated 1987 are simple things.



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Did you check the gas cap? On newer cars this is often the problem. Sometimes it will go off after fixing the cap, but othertimes it might need to be reset by someone with a scan tool.

Posted on Jan 09, 2009


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1 Answer

Reset emission check light

Disconnect battery for 5min.

Aug 31, 2014 | 1987 Ford Bronco II

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Idels to high when running

I am going to assume this is a full size Bronco with a 4.9 or 5.0 engine.
The computer controls the idle speed by the amount of air allowed into the intake thru the idle air control valve.
If the throttle body is dirty or the valve fails, or if you have a serious vac leak, the engine RPM will be higher than normal.

Sep 16, 2012 | 1987 Ford Bronco

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How to reset the emission light on a 1987 ford bronco II 2.9L V6

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Nov 25, 2011 | 1987 Ford Bronco II

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I have a 1987 ford bronco II 2.9L V6 how could you reset the emission light without takin it to the shop???

disconnect the battery fo 10 minutes. If the light comes back on, you have an issue that needs to be scanned and diagnosed by a professional. Or you could take it to a parts store that offers free code reading. Hope this helps

Nov 21, 2011 | 1987 Ford Bronco II

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Trying to install starter solenoid for 1987 Ford Bronco full size 302.5 engine. Cann't figure out color wire placement.

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May 10, 2010 | 1987 Ford Bronco

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The only way air can get in the fuel line is if you have a hole in it! Problem of course is were? I would run the fuel line from back to front and back again. Look for any wet spot that you can find. You may even have to drop the tank to ba able to look on top. I would suspect the problem is in the line before the high preasure pump, being as you are pulling air into the system. I have seen leaky lines allow air in, but not let fuel out.

Sep 12, 2009 | 1987 Ford Bronco

1 Answer

1981 ford bronco failed emissions twice

Look behind the motor, next to the firewall. There's a vacuum check valve that keeps the air gulp pump from pressurizing the crankcase. Mine was shot; had the same symtoms. Also, make sure that the EGR valve is closing at low idle.

You don't need an engine light to check the codes. First, do a KOEO (key on, engine off), but, let me tell you, when this happened to me (1986 Full size with 302 EFI, multiport injection) NOTHING showed up. No one, not Ford, not emission specialists, nada, knew the vacuum check valve existed.

By the way; are you getting motor oil in the air filter housing?

Jun 03, 2009 | 1981 Ford Bronco

1 Answer

Muffler problems 3

If they don't require emissions where you're going to take the Bronco, as long as your lights, horn, signals, etc all the required things are working, you shouldn't have a problem with it. The fact that the muffler was bad when you went to emissions, this is the reason why it failed there.

Sep 01, 2008 | 1987 Ford Bronco

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