986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Stumble off idle

Silber · 08-28-2019, 05:48 AM

Little bit of follow up, thanks for the tip on the vacuum leak, did some research and it turns out you can check for a vacuum leak with Durametric by looking at MAF values.

At idle MAF should be 10 to 15. If you have a vacuum leak it will be lower. My MAF value is actually higher, 25 to 27 at idle spiking to 90 if any throttle movement.

So, it looks like the MAF sensor actually is bad. A vacuum leak would’ve showed a lower number.

MAF arrives tomorrow, we’ll see if that fixes it.

Silber

08-28-2019, 05:48 AM	#3
Silber Registered User Join Date: Aug 2016 Posts: 166	Little bit of follow up, thanks for the tip on the vacuum leak, did some research and it turns out you can check for a vacuum leak with Durametric by looking at MAF values. At idle MAF should be 10 to 15. If you have a vacuum leak it will be lower. My MAF value is actually higher, 25 to 27 at idle spiking to 90 if any throttle movement. So, it looks like the MAF sensor actually is bad. A vacuum leak would’ve showed a lower number. MAF arrives tomorrow, we’ll see if that fixes it. Silber __________________ 2002 Boxster S - Silver/Boxster Red Coilovers - LSD - CAI - High Flow exh. - F&R Adjustable Sways LN 3.2 to 3.8 - parts acquired, pending assembly and tuning