Discussion
An engine shows long term fuel trims of plus 25 per cent at idle falling to plus 4 per cent at 3000 revolutions per minute under load.
Which fault does this pattern suggest?
Answer: B
A fixed size leak is a large proportion of the small idle airflow and a negligible one at load. That load dependence is the signature of a vacuum leak rather than a proportional fuelling error. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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