Quote:
Originally Posted by UFO
Diesel engines do not regulate AFR, there is no throttle. As long as the turbo supplies enough air, the AFR will be lean under all load conditions.
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Although the mechanism differs from petrol, diesels main party trick is changing AFR to suit load conditions. A diesel can run 100:1 at idle and 14:1 under load. If diesels always ran lean, they wouldn't make smoke under heavy load - even the latest BMW will put out visible smoke if driven hard.