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flatjack9 · 11-02-2021, 09:50 AM

Engines used to run with full vacuum at idle. As emissions laws came in to effect, vacuum was changed to ported to help lower emissions.

11-02-2021, 09:50 AM	#19
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,527	Re: Lean MisFire Engines used to run with full vacuum at idle. As emissions laws came in to effect, vacuum was changed to ported to help lower emissions.