1. Battery Capacity Diminished. Far and away the number one reason that your Focus won’t start in the cold is the battery. A battery has two different ratings, cranking amps and cold cranking amps. Cold cranking amps are the batteries ability to start turn the engine over when it is cold. Battery capacity diminishes with time and use. Starter won't crank, seems locked by something electrical. Car won't start - no sound even coming from starter. *PROBLEM FIXED*. I have a 2000 Ford Focus SE 2.0 SPI. The engine won't start because the starter motor won't engage/energize. The battery works fine, the headlights illuminate even while attempting to start the engine. Intermittent failure to idle, stalling. I have the cursed sudden idle failure problem. The car is a 01 SE Wagon with Zetec 2.0L engine/auto trans. When the problem strikes, the car will stall at stoplights, and even on deceleration, causing loss of power steering, etc. This is un-nerving and dangerous. RPM fluctuation while idling. I have a 2003 Ford Explorer that hasn't been idling well lately. It normally idles around 800 or 900 rpms, but lately it will slow down to 400 or 500, then burst up to 1100 and repeat the process again. It doesn't do this all the time, maybe only half-time. Occasionally the rpms get so low that the engine dies, but The car starts about 9 out of 10 times. I have put a new starter/solenoid, battery, fuel filter, ignition cylinder switch in, checked and cleaned grounds and other wires running to and from battery, all fuses are good, all relays are good, checked alternator, even put a new ignition coil in for giggles. A failed relay will disable the dash lights and warning chimes that normally come on when the key is inserted into the ignition, and will probably be unable to start or turn over the vehicle. 2. Engine will not start. Another common symptom of a problem with the ECM power relay is an engine that will not start or turn over. A faulty MAF sensor can cause all kinds of driveability issues: hesitation during acceleration. lack of power. misfires. surges. The most common problem withthe MAF sensor is dirt trapped inside the sensor, usually around the hot wire. Often, using a MAF sensor cleaner will help restore proper operation. Vay Tiền Nhanh Chỉ Cần Cmnd Asideway.

ford focus intermittent starting problems