Question about 1991 Ford Bronco

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1991 ford bronco idling to fast egr code

Engine idles to fast. check engine code refers to egr valve

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Posted on Jan 02, 2017

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SOURCE: 1999 Ford Escort idle problems

you need to look for a vacume leak thsi would also make your IAC valve go beyond range.good luck

Posted on Sep 12, 2008

  • 491 Answers

SOURCE: Engine idles to fast and runs rough

you can check timing, or check for vacuum leaks

Posted on Oct 12, 2008

  • 8836 Answers

SOURCE: 1990 ford bronco, full size,

Hi, for the truck to idle high, there must be air getting into the engine that shouldn't be. One obvious thing to check is the throttle plate. The throttle should close almost fully. The throttle cable should also be a little loose with the throttle plate fully closed. If the throttle is closing OK, then look at other ports that can let air into the engine downstream of the throttle. These may include the EGR port, the PCV port, the EVAP purge port, among others. Though you have changed the EGR valve, check to make sure the solenoid valve isn't stuck open, which would allow vacuum to keep the EGR valve open. You can check this by simply disconnecting the vacuum line from the EGR valve to see if the idle will come down. You can take the same approach with the other ports--remove each hose attached to the intake manifold and plug the port with your finger to see if it makes a difference. If none of the ports, when blocked, will bring down the idle, then you have to suspect an intake manifold gasket leak. You can check this by spraying carb cleaner on the gaskets while the engine is running. If the engine speed changes at all when the gaskets are sprayed, you have a leak. If you have any questions either before or after making these checks, please let me know and thanks for using FixYa.

Posted on Apr 02, 2011

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I have a 1995 ford bronco with a 302. When it idles in gear it idles rough and when driving 35 to 45 miles per hour it bucks real bad. I have changed the egr and the sensor on top of the egr. what else...

Hi, Guy! My 95 Bronco runs a little rough whenever one of the vacuum lines gets broken or disconnected. Because of the age, these plastic lines get brittle and break easily. Check them all. You might also want to look at your engine's dampener (behind the engine's main pulley). Sometimes the dampener becomes detached from the pulley and causes the engine to vibrate.

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The egr is only active when the engine is under load, it should not make a difference when you pull the line off. The idle going up and down is due to a vacuum leak, could be the upper intake gasket, these were a common problem and you have to remove it anyway to do the valve cover gasket. The only catch here is that you need a extra long t40 torx driver to get to the bolts that hold it on. These should be available at a good parts store, they were made specifically for this job.

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Look behind the motor, next to the firewall. There's a vacuum check valve that keeps the air gulp pump from pressurizing the crankcase. Mine was shot; had the same symtoms. Also, make sure that the EGR valve is closing at low idle.

You don't need an engine light to check the codes. First, do a KOEO (key on, engine off), but, let me tell you, when this happened to me (1986 Full size with 302 EFI, multiport injection) NOTHING showed up. No one, not Ford, not emission specialists, nada, knew the vacuum check valve existed.

By the way; are you getting motor oil in the air filter housing?

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