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  #1  
Old 09-09-2012, 05:58 AM
Usually Stumped
 
Join Date: Aug 2012
Posts: 4
Default 87 Bronco II 2.9 burning rich

Help! I have an 87 Bronco II 2.9. It starts off fine, but when I go up a hill or accellerate, it looses power and gives off black smoke, like it is getting too much fuel. I pulled the fairly new spark plugs and all have even depositing on them (if an injector was stuck, a plug would be clean from the excess fuel) I replaced the egr position sensor as the contacts were corroded, replaced the fuel filter, and fuel pressure regulator. I get no check lights. vac lines all seem ok. I am stumped on this one. I am thinking of replacing the o2 sensor, but have reservations about it because I am not getting a check light.
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  #2  
Old 09-09-2012, 02:42 PM
Psycho Pete
 
Join Date: Jun 2009
Posts: 1,487
Default Re: 87 Bronco II 2.9 burning rich

the first thought that came to mind when I saw the title was FPR, but you replaced that...

if it does it when it the the engine is cold, it's probably not the o2 sensor.

you won't ever see a check engine light illuminate, '87 doesn't have a functioning CEL; which will complicate thing if you don't have a reader. The CEL is burnt out in my 93 Ford, so I tape a light up to the windshield and wire up the diagnostic connector to pull codes (I'll get around to replacing it someday ). Can use an analog meter too, but easier to have that light in your face in the cab. But you should definitely pull codes.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto

Last edited by Psychopete; 09-09-2012 at 02:52 PM.
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  #3  
Old 09-11-2012, 06:23 AM
Usually Stumped
 
Join Date: Aug 2012
Posts: 4
Default Re: 87 Bronco II 2.9 burning rich

I was able to pull codes using some spare wire and a 12v landscape bulb (qualitiy backyard engineering) got egr not opening and o2 sensor codes.
I pulled off the egr valve and found it was full of crud, the passage to the intake is all blocked up. I figure if the egr is clogged, that will trip off the o2 sensor and call for extra fuel to compensate. I will pull off the trottle body and clean out the passage and replace the egr valve. Going to try to get home early today to do it. I think this may solve the problem. I will post with the results as soon as possible. Thanks for the reply, it made me figure how to pull codes and I would not have found this blockage otherwise. dmk.
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  #4  
Old 09-11-2012, 07:10 AM
Psycho Pete
 
Join Date: Jun 2009
Posts: 1,487
Default Re: 87 Bronco II 2.9 burning rich

What code did you get on the o2 sensor? 41 a lot of times is a vacuum leak and the o2 is actually doing the right thing by sensing the excess oxygen in the exhaust. That would definitely would cause you to run rich.
__________________

1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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  #5  
Old 09-11-2012, 07:28 AM
Learning to use the forums
 
Join Date: Sep 2012
Posts: 1
Default Re: 87 Bronco II 2.9 burning rich

i am having a similiar problem with a 91 ranger with a 2.3 in it . it seems to just run out of feul sometimes. it will shut off with you going down the road but if you turn the key switch on and off a couple of times it will start back up and run for a while. i have replaced the fuel pump and filter next is the fuel prussure reg i think. any body have any ideas
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  #6  
Old 09-15-2012, 05:12 AM
Usually Stumped
 
Join Date: Aug 2012
Posts: 4
Default Re: 87 Bronco II 2.9 burning rich

Best adivice I got was to pull the codes (thanks Physcopete). It got me looking in places that I did not think about and I am finding things that could be the potential cause of the problem. Mine sputters like its running out of gas but gives off black smoke like its getting too much fuel. It does this only when I am putting demand on the engine.
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  #7  
Old 09-23-2012, 06:15 PM
Usually Stumped
 
Join Date: Aug 2012
Posts: 4
Default Re: 87 Bronco II 2.9 burning rich

The trouble codes I got were for O2 sensor and EGR not opening and closing. I pulled off the Egr valve and found the passage into the intake manifold was clogged solid. I cleaned it all out and put a new EGR valve on. The Power is back! The Black smoke has stopped! Runs like the day I got it. Thank you Phychopete for your help. You got me on the right track to fixing this. If you are ever up north as far as you can go without leaving the country, stop in....I owe you a beer.
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  #8  
Old 09-25-2012, 06:49 AM
Psycho Pete
 
Join Date: Jun 2009
Posts: 1,487
Default Re: 87 Bronco II 2.9 burning rich

Awesome, I am always up for a beer.
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1987 Ford Ranger Short Bed 5.0L/T-5 Project
1988 Ford Ranger Long Bed Parts Truck
1993 Ford Tempo 2.3L OHV HSC Auto - D/D Stock.
1999 Honda Accord VTEC Auto
2002 Dodge Caravan - 3.3L Auto
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