P0316: Misfire in the first thousand revolutions needs start-up evidence

P0316 identifies misfire during the first 1,000 revolutions after start-up in Ford's published strategy. The timing is the defining clue. A later warm idle can be smooth even though the early-start evaluation detected a significant problem.

Preserve the beginning of the event

Useful evidence includes starting coolant temperature, cylinder-specific misfire counts and the conditions during those first revolutions. Ford's general misfire system evaluates rates over 200- and 1,000-revolution windows, with separate catalyst-damage and emissions purposes. A total trip count can hide when the start-up contribution occurred.

The source does not assign P0316 to one particular component. Ignition, fueling and mechanical conclusions require additional evidence; the code's useful information is that the abnormal combustion was observed early.

Confirm monitor prerequisites and history

The misfire strategy depends on crank/cam signals and learned profile correction factors. It can temporarily exclude rough-road, fuel-cutoff and high torque-change conditions. Check that the monitor was active before treating an absence of later counts as successful verification.

Ford's Mode $06 descriptions include current-cycle counts and weighted history over previous cycles. Distinguish those values when comparing before and after results, because historical counts need not disappear immediately after a successful repair.

A relevant verification reproduces an eligible start-up and examines the early window. The document does not prescribe one universal cold-soak duration, a replacement part or a guarantee that a warm restart will exercise the same condition.

Source and applicability

This explanation covers the cited Ford monitor variants, not every vehicle displaying this code. Match the engine, sensor architecture and calibration before applying numerical limits.

Ford OBD summary, PDF page 10, Ford OBD summary, PDF page 11.