Question about 1988 Ford Bronco II

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88 bronco II 2.9L with problem

I have a bronco that idles rough, gets up to speed, but will not keep constant speed with out chuggin. It only runs some what smooth if you are pushing on the gas, accelerating, or off the throttle completely. I just put a new fuel filter, plugs, wires, cap, rotor, and the O2 sensor is no more than 5 months old. It is a beater so if there is any way to "rig" it, that would be fine. Any advise is appreciated, thank you.

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Try replacing the fuel pressure regulator

Posted on Oct 29, 2008

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What can I do to fix my 1988 Ford Bronco xlt with a 351 engine that has rough idle and loss of power when in drive?


Fuel filter. Low fuel no power. Catalytic converter. no air out, no air in. loss of power.

Jan 25, 2015 | 1988 Ford Bronco

1 Answer

Bronco II 1987 v6 2.9-well manufacture date is 10\87 but that means parts are 88' right?


Look at your registration, note "model year" If you ar still unsure, call a Ford dealer and ask them to look up your vin #. They will know for sure.

Sep 07, 2012 | 1987 Ford Bronco II

1 Answer

Rough idle up and down 1988 ford bronco has a new Idle Air Control Valve was thinking it could be the MAP sensor or the coolant temp sensor anyway tho check either of these.


Try discoonecting the battery for a few minutes, and then reconnect and drive it, it may have to "relearn" proper idle speed.

Nov 06, 2009 | 1988 Ford Bronco II

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I have a 1988 ford bronco full size xlt it is ideling low when u


I just had the same issue with my 88 xlt w/351 W it wound up being the MAP sensor and the timing. I would check both of these and see if it solves your issue.

Feb 17, 2009 | 1988 Ford Bronco II

2 Answers

1988 Ford Bronco II 2.9 V6 5 sp. trans. Air power steering


Interesting problem... I myself own an 88 Ford Bronco II 4wd 2.9L V6. I have issues with my idle reving up to 1500 to 2000 rpms at stop. I have not yet resolved the issue, however, I do believe that sometimes electronic components are to blame...such as the brain or "Mother Board" of the vehicle. I replaced the "Brain" on two previously owned vehicles with instant results. I would suggest the local junkyard for a try...only as a last result. The "Brain" is located on the passenger side along the Interior wheel well. If you look along the front passenger side wheel well inside, beneath the plastic, vinyl, etc....you will find a metal enclosure that is comparable to a computers cd drive or hard drive........Approx. 4" x 6" give or take. The Board will have a wide slot plastic attachment plugged into it...very similar to an IDE slot on a computer.
This is the Brain......for your Bronco II.
Buying a used Brrain is a Gamble ...
You could get a bad brain!!!

BUT...You could get an instant repair!!
Who's to decide?
I had an 1986 BMW 325I
Suddenly One Day....
It started Reving up and down erratically....I was at a loss.

Luckily, I had a friend who was a BMW mechanic, and informed me that there was a relay in my glovebox that controlled my idle. I took a chance and tried replacing the relay with one I purchased at the junkyard...although they wanted $50 for it...I was willing.....and the new /USED idle conrol relay turned out to be an affordable fix. Thankfully

Jul 30, 2008 | 1988 Ford Bronco II

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