Do new coil packs make a difference?
More windings and heavier gauge material for those windings typically improves the performance of a coil. Davis points out however that often even with those changes an upgraded coil can fit within an OEM size case or housing, or one that is only slightly larger.
Can a coil pack be bad and not throw a code?
A shorted or open fuel injector solenoid, or a shorted or open coil will usually set a code, but a dirty or weak fuel injector or a weak coil probably won’t set a code. Bad spark plug wires are a common cause of misfire codes.
What does a bad coil pack sound like?
Engine misfiring will be seen in a vehicle whose ignition coils have failed. Trying to start the engine of such a vehicle will result in engine misfiring that sounds like a coughing, sputtering noise. A vehicle with a failed ignition coil will also result in vibration when it is idling at a stop sign or light.
Where are the coils on a Subaru Outback?
The coil packs on my 2001 and 2003 are 4-terminal packs. The two primary coils are between pins 1 and 2 and pins 3 and 4. Using a digital multimeter to measure the resistance for each of these coils gives me an out-of-range indication.
How many ohms are in a Subaru coil pack?
With those, the high voltage secondaries, and the low voltage primaries (0.73 Ohms) of the coil could be checked at the terminals as shown above. With these, as subiesailor noted, the separate igniter has sometime been found to have failed.
Where are the coils on a 2001 mower?
The coil packs on my 2001 and 2003 are 4-terminal packs. The two primary coils are between pins 1 and 2 and pins 3 and 4. Using a digital multimeter to measure the resistance for each of these coils gives me an out-of-range indication. This means the resistance is higher than the meter will measure.
What are the connections in a coil pack?
The four connections at the electrical harness connector are 12V, ground, and two lines which carry trigger signals from the ECM. The 12 V and ground terminals can be measured (between them for a short), and between those two and the two trigger signal pins. All should have high resistance.