Ford Focus - How to Test a Faulty Coil Pack on a Ford Focus. Hi, I'm looking for a little advice. I own a Ford Focus Ghia (Y reg), and yesterday went to pull onto a roundabout and it started driving like a bag of nails. Feels like a misfire - low on power, engine not running smooth and a distinct smell of rotten eggs.
This Ford Fiesta 1.0 EcoBoost was brought into us with its oil pressure warning light on and its engine sounding a bit noisier than it should. After stripping the engine our previous guesses turned out to be correct, the wetbelt had been degrading (as they do over time) leaving deposits of rubber in the oil which were being sucked into the oil pump pick up and causing it to block subsequently 1. Low 12V battery or faulty alternator. If your car's battery is low on charge, it can disrupt the power supply of the electrical system of the Ford Focus and cause the "Engine Fault Service Now" message to appear. A low battery can cause problems with the ECU because it just won’t supply it with the needed voltage. Looks like a problem with a poorly charged battery. First check the alternator charing voltage, with the car running, should be btw 14.4-14.8V. When charging your battery use a charger that supplies 15.2-15.5 VDC. This may seem bit too high, but batteries with Ca-Ca or silver-Ca plates require higher charging voltages. ARSaNFT.