Mercury Repair Questions? Ask a Mechanic for Answers ASAP
Hello, so the car has normal power just races when you accelerate? High Idle in park or neutral on start up? Is the check engine light and have you had it checked for codes with a scan tool?
Is the accelerator pedal hard to push like it is sticking? Have you checked the engine for any vacuum leaks back by the throttle body area. There is a vacuum tee on both sides of the throttle body that likes to collapse and suck in air.
Ok, double check the two vacuum tees at both sides of the throttle body for being collapsed, this is a common issue for a high idle as it pulls in unmetered air. The Idle air control valve controls the idle speed so it may be sticking at times. Usually they cause crank/no start issues when they have problems but is a possibility. Make sure the throttle plate is free from any carbon buildup. If it is sitting patrially open when it should be closed it will also cause a higher idle.Remove the air inlet tube to it and use carburertor cleaner and a small toothbrush and clean out any carbon buildup around the throttle plate. Start the car up it will crank longer until it burns out the carb cleaner. Then recheck. If it is still having a n issue, a diagnostic check for trouble codes would need to be done. Being an EEC IV system, if you dont have a scan tool, you can jump the self test connector under the hood and count the check engine light flashes. 11 or 111 is pass.
Do you need more help with this concern?
Hello, do you need more help or information?