Join Date: Nov 2010
Location: Wheat Ridge, CO
Car Year: 2001
Car Model: Forester
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"For example, a coil that is beginningThese symptoms are exactly what I experience with the vehicle. At idle, especially under load (accessories running, heater, lights), it stumbles and misses. It feels like the engine is about to stall out. Under acceleration load the vehicle again does not have a smooth/consistent rpm increase... it jumps all over until the engine is unloaded at a cruising speed.
to develop a defect could have no noticeable effect on engine performance
at idle when the running compression pressures are low, but will cause a
cylinder misfire under acceleration when cylinder pressures are high.
Higher engine speeds increase the likelihood of misfire because there is
less time for the coil to build up its electromagnetic field."
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