Question about 1989 Ford Bronco
Hi! Used to work on one. I replace the MAF (mass air flow) sensor and it got better. You should have the MAF checked for it may be faulty and replace it if necessary. Hope this helps and have a good one!
Posted on May 08, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.
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