Rough running Bronco II
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Posting Guru
Joined: Nov 2003
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From: California Desert
Rough running Bronco II
My grandmother has a lemon of an '89 Bronco II, 2.9L, automatic, 4X4. She finally made the last payment on it and now it's running rough. I did a complete tune-up about a year ago to help it pass smog. When cold, the engine has an eratic RPM with almost a missing feel to it. A lot of unburnt fuel can be smelled. When put into reverse, the engine idles normally and has plenty of power. When put into drive and you step on the gas, it hesitates and then runs fine. I haven't had a chance to look at this particular problem because I was busy making the transfer case drop out of 4X4 mode that it got stuck in. Any suggestions before I start digging would be very useful. Thank you!
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Joined: Oct 2003
Posts: 413
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From: Connecticut
Welcome to FTE maticuno,
How inclined are you? 01-10?
Your EEC-IV codes can be pulled using a Volt / Ohm Meter
using procedures in:
https://www.ford-trucks.com/forums/s...hreadid=107538
*The Haynes Repair Manual also has the procedures for testing*
--------------------------------------------------------------
The vehicle's CEL flashed sequentially, to the rhythmic sweeps of the V-O-M Needle
__________________________________________________
Happy Holidays Grandma! 
How inclined are you? 01-10?
Your EEC-IV codes can be pulled using a Volt / Ohm Meter
using procedures in:
https://www.ford-trucks.com/forums/s...hreadid=107538
*The Haynes Repair Manual also has the procedures for testing*
--------------------------------------------------------------
The vehicle's CEL flashed sequentially, to the rhythmic sweeps of the V-O-M Needle
__________________________________________________
Happy Holidays Grandma!
Last edited by wolfen; Nov 21, 2003 at 07:54 AM.
Thread Starter
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Posting Guru
Joined: Nov 2003
Posts: 2,107
Likes: 3
From: California Desert
Depending on the technology involved, I'm between a 4 and a 7. I can rebuild any carb in complete darkness...but with all the wiring diagrams in the world I'm still a bit confuzzled with EFI.
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