Cold Start Rough Idle

916MKIIIx2 · 05-25-2011, 07:13 PM

Ok so im getting the fuel filter tomorrow, so I decided hell maybe the 91 octane I had wasnt helping, went to the local shell and put 96 octane in. With the 91 octane it was constantly running rough on every cold start, with the 96 octane it only runs rough on the first cold start of the day but after a much shorter amount of time the rpms will kick up about 300 rpm and it smooths out instantly, as before the rough idle would just slowly go away after it got completely warm, with the good gas it will run rough for about a minute then rpms will just up slightly and smooth, I'm still going to replace the fuel filter seems like it needs it regaurdless, but is there anything else that could be wrong? How can I check the cold start injector and does anyone have good pics?

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05-25-2011, 07:13 PM	#8
916MKIIIx2 3" Exhaust Join Date: Nov 2008 Location: California Posts: 152	Ok so im getting the fuel filter tomorrow, so I decided hell maybe the 91 octane I had wasnt helping, went to the local shell and put 96 octane in. With the 91 octane it was constantly running rough on every cold start, with the 96 octane it only runs rough on the first cold start of the day but after a much shorter amount of time the rpms will kick up about 300 rpm and it smooths out instantly, as before the rough idle would just slowly go away after it got completely warm, with the good gas it will run rough for about a minute then rpms will just up slightly and smooth, I'm still going to replace the fuel filter seems like it needs it regaurdless, but is there anything else that could be wrong? How can I check the cold start injector and does anyone have good pics?