89 Bronco running rich - Ford Bronco Forum
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 10-04-2008, 11:22 AM Thread Starter
Registered User
Join Date: Sep 2008
Location: Dallas,GA
Posts: 14
Bronco Info: 1989 Bronco 351w C6 32's
iTrader: (0)
Angry 89 Bronco running rich

Hi i have an 89 bronco with a 351 and a c6. it is sped density and runs great while driving. it just idles rough and blows black smoke out when it shifts gears or at initial startup. every time you start it 2 clouds of black smoke appear out the sides, and all the time it runs it smells very very rich. lately it gets crap for gas mileage used to get 14 now gets 7. i ran 93 octane in it and no difference.
bronco boy 12 is offline  
Sponsored Links
post #2 of 4 (permalink) Old 10-04-2008, 11:30 AM
Big feet, big hands & a
Bilzhorse's Avatar
Join Date: Oct 2003
Location: Stafford, Va
Posts: 767
Bronco Info: 89 XLT, 5.8, C-6, BW1356, factory LSDs, 33s
iTrader: (5)
If you haven't checked for codes do it now. There are many threads on how to do this. Faulty O2 sensor, bad EGR are a couple of things that could be wrong. But def. check the codes first.
Bilzhorse is offline  
post #3 of 4 (permalink) Old 10-04-2008, 11:44 AM
sackman9975's Avatar
Join Date: Dec 2007
Location: The Mitten
Posts: 8,710
Bronco Info: 1995 XLT 5.8 with 97k miles, WARN Premium Hubs
iTrader: (48)
Originally Posted by Bilzhorse View Post
If you haven't checked for codes do it now. There are many threads on how to do this. Faulty O2 sensor, bad EGR are a couple of things that could be wrong. But def. check the codes first.
Or ECT (engine coolant temp) sensor........... But yes pull codes first.
sackman9975 is online now  
post #4 of 4 (permalink) Old 10-04-2008, 12:07 PM
Registered User
seawalkersee's Avatar
Join Date: Dec 2006
Location: Outside KCMO
Posts: 1,257
Bronco Info: 84 FSB with a 6.9 diesel/zf 5, supercharger, and 33s.
iTrader: (2)
Or BAP sensor. Or bad PCM. Or a bad fuel pressure regulator. I could go on and on. Also, you are wasting your lute if you are running anything over 87 octane and there is no ping. The function of octane is to slow down the burn of the gas (thus losing power if you do not need it). Ping is gasoline exploding in the combustion chamber prematurily. So if you do not have that, you will be good ta go with 87.

The problem with the older systems is that the ECT, BAP, FPR, and a few other problems may not trip a code (including the PCM AND at times the 02s). So try the codes first and then you will have to start with a wiring diagram and a break out box.


After Midnight Project music. Subscribe and see how good they are, and how good you will feel.
seawalkersee is offline  

  Ford Bronco Forum > Bronco Discussions > 1980-'96 Bronco Tech

Quick Reply

Register Now

In order to be able to post messages on the Ford Bronco Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself. DO NOT USE Gmail.com accounts. If you only have a Gmail.com email please contact the administrator here

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome