![]() ![]() He said 99% of the time it is usually the coil or plug. So I called an old friend of mine who is a Ford Master Senior Technician. After putting everything back together, check all the electrical wiring and I switch the coil/spark plug to cylinder number 4 (just to see if the problem changes code) I cleared the codes and test drove under heavy load and again the check engine light flashes. I decided to replace cylinder 1 fuel injector. I checked the fuel injectors and they all were clicking. I did a compression check and all the cylinders were all good. But when I drove it under a load, the check engine light started to flash. The Edge started up great and sounded great. After completing this I had the engine codes erased. Then a week ago I decided to replaced all the spark plugs with new Motorcrafts, replaced all the ignition coils, replaced the Catalyst sensor and checked for vacuum leaks. The checking engine light will start to flash and the engine will run rough, but when the light stop flashing the engine ran smooth again. When checking for the engine codes, I retrieved 2 check engine light codes P0420 ( Catalyst System Efficiency Below Threshold Bank 1)and P0301 (Cylinder 1 misfire). Now originally about a year ago I did a spark plug change at 100,000 miles, I know I should have change the coils but they were out of my budget at the time and the engine was running great. About 2 weeks ago the Edge started having hesitating either going up a steep hill or under heavy acceleration loads (Over 4,000 RPM's). I have a dilemma with my 2011 Ford Edge Limited FWD 3.5L, 113,000 miles.
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