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toast · 07-02-2019, 12:09 PM

A leak will show up as large (20% or so) positive short term fuel trims at idle. Do you have an idle log? If it is very bad they will be maxed (+29%) meaning you are dumping fuel to compensate for the leak and you can dump so much you get misfires.

07-02-2019, 12:09 PM	#8505
toast Senior Member Join Date: Jul 2014 Drives: 14 BSP Edelbrock BRZ Location: Lon Gisland Posts: 806 Thanks: 113 Thanked 452 Times in 257 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	A leak will show up as large (20% or so) positive short term fuel trims at idle. Do you have an idle log? If it is very bad they will be maxed (+29%) meaning you are dumping fuel to compensate for the leak and you can dump so much you get misfires.