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1986 Bronco 302 and 1996 Bronco 351
43 Posts
Discussion Starter · #1 ·
Looking to buy a bronco with a rebuilt engine and some performance parts added to it. Also the emission system has been deleted. It runs exceptionally well with very low miles on the engine, but it surges for a couple minutes when it idles cold. Owner told me this is because ECU is getting tripped up. Is there anyway to fix this problem?


1,282 Posts
No codes?
Frequently a hunting idle is indicative of a vacuum leak. Does it have a MAF? Is it dirty? If that part of the air intake is dirty or Carboned up it can be slow to react and make the idle vary.
I am using old Tapatalk so can't see if you list the vehicle year, motor year, etc.

Sent from my Pixel 3 XL using Tapatalk

Super Moderator
33,256 Posts
Yo gentbronco,
As rpeters549 asked about codes; Try a Self Test for Diagnostic Trouble Codes by my pal, BroncoJoe19 @ Code Reader.....

See my Vacuum leak test in post #11 incl jowens126 HVAC Control Panel info & Mikey350 tests @ Help with dtc codes and idle



Here is some info for you; 1989 Ford Bronco EVTM, Emissions (yellowish/red book cover) & Pre-Delivery Manuals, Partial via mrnewland1 in Google Drive @
1989 Service manual - Google Drive
Slow scrolling, so download for faster viewing and to see the table of contents, the search feature, etc.

1989 Ford Bronco Dealer Brochure

1989 Bronco Lubricant Specifications by Ford via Gary

Register with VIN to see most Ford dealer maintenance/repairs done @ any dealership nation-wide @ Welcome to Ford Owner | Official Ford Owner Site

For any Bronco questions, it's better to post each seperately in Noobie Bronco Tech Questions. Flame free zone. This will get more attention and you can build up your post count to get into other sections such as Bronco and Ford Parts/Accessories (75 posts required to participate due to scammers who preyed on our members).

To save you time and for better responses, please fill out your Bronco info with location, year, engine size, transmission type, transfer case type (manual or electric shift), locking hub type (automatic or manual) info & major mods such as a Lift, etc. .
Bronco info is now able to be put under your user name.
Click your profile button in the top right and go to account settings.

On that first page, named Account Details, scroll down to "Vehicle Info" and type in up to 100 characters.

Now you can simply enter your information in the text editor and click save.

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Baba Looey's Favorite FSB Links (lots and lots of tech links)

See and Vote in our current Full-Size of the Quarter Contest & later, Full-Size of the Year Contest @ Voting
You will get ideas by those competing.
Also see the prizes!

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