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Diesel AFR

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Is it normal to see an AFR of 15:1 spike for 1 second when you put your foot to the floor when logging AFR on the road, then levels out at 18-20 at WOT. Is that spike OK?

Thanks

Graham

Spikes can be normal, though leveling to 18-20 under WOT is....no bueno.

18-20:1 is safe and no smoke is what I read, what would you recommend.