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Idle Question?

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Old 02-09-2017, 03:48 PM
Iron Port Iron Port is offline
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Question Idle Question?

When I start my Bronco It idles at 1200 RPM, Then surges between 1100-1000RPM and will jolt hard into reverse or drive and will want to accelerate up to 14 MPH without hitting the gas pedal. Is my idle to high and what is my Bronco supposed to idle at?
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Old 02-09-2017, 07:35 PM
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A little more information would be helpful to better help with your issue.

What year Bronco and what engine?
Have you tried checking for engine codes?
Is this idle only happening when cold or at all times?

When cold, most EFI controlled vehicles will be in 'Open Loop' mode which throws in more fuel to help bring the engine to proper operating temperature. The idle is typically higher in open loop, but it sounds as if yours is too high.

What I would first do is check for engine codes. If your truck is 1995 or older, checking the codes is incredibly easy. You just need a paperclip and need to jump two pins on the diagnostic port. It may be in a different location depending on the year of your truck, but the process is the same.

Here is a link that a user on another forum made that explains the process pretty well:
1983 Ford Bronco Diagrams picture |

If codes pop up, it would be a good thing to check those out first as the codes may be relating to your problem.

Off the top of my head, things that CAN cause high/erratic/incorrect idles are:

-Vacuum leaks
-Dirty/bad Idle Air Control Valve
-Bad Throttle Position Sensor

Usually a messed up idle isn't that big of a fix, but finding the issue can sometimes be tedious. I'm sure you'll be able to correct it though with the help of people on this forum!
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