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ddub · 2007-11-08, 02:01 PM

I was suspicious of a leak, but cant seem to find any. I just took it for a short drive, idle is getting better, but still acting slightly funny. My vacuum pressure at idle is usually a little less than -.05Mpa. When I let off the gas, vacuum pressure would normally go to that position, but now it jumps up to -.03 and has to catch it's self before it goes back to normal. It acting like it's running lean. The weird thing is that it was idleing fine before I cleaned the MAF. There is a good write up on the code P0171:
http://forums.nasioc.com/forums/show...ighlight=PO171
I checked the small vacuum hose that runs off the engine block, that is secure with a hose clamp. Maybe my O2 sensor is dirty, should I try cleaning that?

2007-11-08, 02:01 PM	#7
ddub EJ22 Join Date: Aug 2005 Location: Reno, NV Posts: 110 Car: 04 wrx, bunch of mods	I was suspicious of a leak, but cant seem to find any. I just took it for a short drive, idle is getting better, but still acting slightly funny. My vacuum pressure at idle is usually a little less than -.05Mpa. When I let off the gas, vacuum pressure would normally go to that position, but now it jumps up to -.03 and has to catch it's self before it goes back to normal. It acting like it's running lean. The weird thing is that it was idleing fine before I cleaned the MAF. There is a good write up on the code P0171: http://forums.nasioc.com/forums/show...ighlight=PO171 I checked the small vacuum hose that runs off the engine block, that is secure with a hose clamp. Maybe my O2 sensor is dirty, should I try cleaning that?