1993 Ford Escort ford escort OBD1 reading

1993 FORD ESCORT
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SHAWWAF
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  • 1 POST
OBD1 reads BOO switch ciruit faulty/ not activated during KOER test key on engine running (code 536), Also trying to find out what is making car feel like its getting no gas needing to take foot off the gas peddle for shot periods of time in order for car to be able to accelerate does it more when trying to pick up speed on highway or when the car is first starting and when heat or air conditioning on already changed fuel pump fuel filter tune up
Nov 11, 2013 at 6:29 PM
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TY ANDERSON
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Some scan tools will provide a KOER self test for Ford vehicles. During this KOER test it is required that you press the brake pedal and turn the steering wheel a 1/4 turn when the test is running. If you don't do this the test will flag an issue such as the brake.
There are a few components that can cause poor engine performance specifically with acceleration. No getting enough fuel or improper timing, restricted fuel injectors or restricted exhaust and a sensor (throttle positioning sensor) acting up causing poor engine performance.
A simple test with a vacuum gauge can tell you if the engine is mechanically sound and if the air fuel mixture is decent and if the exhaust is restricted.
During engine performance diagnostic ruling out components will narrow parts down to what is causing the poor acceleration.
Let me know if you have more questions
Nov 11, 2013 at 10:51 PM
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