Idle problems

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Sep 23, 2005 | 09:27 AM

blockheadbob

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Joined: May 2004

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From: Idaho Panhandle

Idle problems

I have a 85 Bronco II with a 5 speed and I have a few questions. The idle varies from high to low after driving it for a while. I was told that there is a modulator or something on the fender well that could be bad anyone have any ideas? What size tires did these come out with and what is the largest size I can put on with out problems? Also what kind of fuel mileage should I expect to get? Just a ballpark figure will do. Never owed one of these before so any help that I can get would be appreciated.
Thanks,
Bob

Sep 24, 2005 | 12:57 AM

Monty06

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Joined: Aug 2004

Posts: 1,167

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From: miami florida

welcome to fte first off i would recommend you read the first top posts in the bronco2 forums and that will answer some of your questions right off the bat.

Sep 25, 2005 | 09:56 AM

blockheadbob

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Joined: May 2004

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From: Idaho Panhandle

Thanks anyway:

Since I really dont know anything about a vehicle this new I dont know what to look for. But thanks anyway.
Bob

Sep 26, 2005 | 07:13 PM

Ken00

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Joined: Dec 2001

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From: South Jersey

Can someone familar with the 85 help with this one?

Nov 20, 2005 | 12:43 AM

Punisher85

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Joined: Nov 2005

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I might be too late for this cause im new here.

the module meaning the heatsink for the tfi module? I don't know if the 1985 bronco II's has those I can find out and tell you but if you can't find it than you probably don't need to worry about it. I have a 85 B2 2.8l(carb) and the only module that you are discribing is mounted on the distributor right in front of the firewall. It could be the module(tfi) or (ICM) ignition control module. My B2 is having the same problem it is either the (ICM) or check the carburetor setting and sensors they have alot to do with high/low idle. I would seriously go to a auto part store and buy a haynes/chiltons repair manual. I will hopefully set you in the right direction. Unless im too late and you already found it. What size eng? Carbureted or EFI? Sorry if I am totally off. I'll keep an eye on this to see what you figured out.

Nov 21, 2005 | 07:53 AM

blockheadbob

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From: Idaho Panhandle

Thanks Punisher85 I really dont know much about this vehicle. What is a tfi module?

Bob

Nov 21, 2005 | 06:46 PM

Punisher85

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Joined: Nov 2005

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tfi

the tfi-IV module stands for thick film integrated-iv ignition system,also known as the (icm)ignition control module. it should look like this pic below.