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Re: Ford auto mechanic?
Just for the record I did check the air filter and air intake box when the problem first manifested. But the nest had apparently not yet been sucked up into the air filter box where it could easily be seen. I didn't pursue it any further since it didn't seem to fit the symptoms I was observing (engine always starting and idling smoothly, quietly, at correct speed for first few seconds), and therefore I directed my efforts toward other tests/inspections.
In hindsight, I can concoct reasons why the rodent nest could cause the problem, but nobody I spoke with prior to that suggested such a mechanism.
The following is probably a question that only a Ford engineer could answer, but I'll toss it out here just in case someone knows:
On the engine in question, does the PCM completely ignore the mass airflow sensor and fuel pressure for the first ~3 seconds after starting, and use some sensorless fuel and air metering strategy? Is that what would cause the engine to always start immediately and idle smoothly, quietly, and at the correct speed for the first ~3 seconds before beginning to misfire?
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