what would cause this? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

cbarile · 02-06-2016, 09:42 AM

I have 2012 automatic 20k miles with ported blower, headers with hiflo cats,2.38 pulley,blower spacer,cai,tune, all work done by formato. I can't get car to him for 2 weeks as he's busy so I thought I'd try here. My check engine light has come on 5-6 times in past month codes are P0171-P0174 lean bank codes. I noticed the engine light after fueling the car on the last few occasions so this morning with a 1/2 tank of fuel and no check engine light on I fueled up at shell gas station with 93 as i always do. I put 7 gallons in wich did not fill it all the way up but when I started the car I watched the engine light come on. What could be causing lean codes by simply putting gas in car and starting it? Anyone else have this issue? I appreciate any input.

KaBoom1701 · 02-06-2016, 10:41 AM

Fuel pressure?

Check your fuel pump pressure....just guessing here...

*mlee* · 02-06-2016, 10:53 AM

http://www.obd-codes.com/p0171

99frc · 02-06-2016, 01:30 PM

Probably bad O2 sensor

ZO6 Bryan · 02-07-2016, 12:19 PM

Quote:

Originally Posted by 99frc

Probably bad O2 sensor

Not likely if it's affecting both banks. P0171 and P0174

derklug1 · 02-07-2016, 12:36 PM

Only thing I could think of is a vent solenoid sticking and making a vacuum leak when the purge solenoid engages, but that should also be giving you evap codes. Since it takes three times to set the evap, maybe the purge vacuum eventually closes the vent solenoid. If you have a scanner that allows you to monitor, fill the tank and then see how long it takes for the fuel tank pressure to go negative.

Stephen12ZL1 · 02-07-2016, 03:09 PM

fueling in the tune is likely to be off...the maf curve needs adjusting

99frc · 02-07-2016, 03:12 PM

Quote:

Originally Posted by ZO6 Bryan

Not likely if it's affecting both banks. P0171 and P0174

Ah yes, you're right. Missed that.

cbarile · 02-07-2016, 04:44 PM

Quote:

Originally Posted by Stephen12ZL1

fueling in the tune is likely to be off...the maf curve needs adjusting

I forgot to mention this, formato tuned the Car one year ago and the engine light thing just started happening a little over a month ago. Yesterday when the light came on it went off few hours later by itself. I usually go to advance have code read and cleared.

02-06-2016, 09:42 AM	#1
cbarile Drives: zl1 Join Date: Jan 2015 Location: fl Posts: 40	what would cause this? I have 2012 automatic 20k miles with ported blower, headers with hiflo cats,2.38 pulley,blower spacer,cai,tune, all work done by formato. I can't get car to him for 2 weeks as he's busy so I thought I'd try here. My check engine light has come on 5-6 times in past month codes are P0171-P0174 lean bank codes. I noticed the engine light after fueling the car on the last few occasions so this morning with a 1/2 tank of fuel and no check engine light on I fueled up at shell gas station with 93 as i always do. I put 7 gallons in wich did not fill it all the way up but when I started the car I watched the engine light come on. What could be causing lean codes by simply putting gas in car and starting it? Anyone else have this issue? I appreciate any input.

02-06-2016, 10:41 AM	#2
KaBoom1701 KaBoom1701 Drives: 13' ZL1 Red M6 Join Date: Dec 2012 Location: I.E. SoCal (Yucaipa) Posts: 8,630	Fuel pressure? Check your fuel pump pressure....just guessing here... __________________ Mods: Roto-Fab Intake, WW Res. kit & Big Gulp Air Scoop, Elite Catch Can, ATI Super Damper & 18% OD Pulley, LF Idler pulley bracket, Metco CC breather, ID850 Injectors, Stainless Power Headers w/ ceramic coating, TR71X Spark Plugs, JMS Fuel Pump Booster, Bo White TB, Tuned by Ted @ Jannetty Racing, Ron Davis HX, D3 Reservoir, Pfadt 1" Springs, Moreno Camber Plates, ZL1 Addons Splitter guard washers, Tow Hook kit & rock guards, Hurst Shifter Billet Plus 6 Speed Short Shifter, ZL1 DRL lighting harness, ZL1 Recaro Seats.

02-06-2016, 10:53 AM	#3
mlee CamaroFans.com Drives: ZLE & ZR2 Join Date: Oct 2008 Location: Conroe, TX Posts: 37,497 View My Garage	http://www.obd-codes.com/p0171 __________________

02-06-2016, 01:30 PM	#4
99frc Drives: 2015 Camaro ZL1 Join Date: Mar 2015 Location: Dallas Posts: 97	Probably bad O2 sensor __________________ 2015 ZL1 #377

02-07-2016, 12:36 PM	#6
derklug1 Drives: 2016 GT350 Join Date: May 2015 Location: grand rapids mi Posts: 145	Only thing I could think of is a vent solenoid sticking and making a vacuum leak when the purge solenoid engages, but that should also be giving you evap codes. Since it takes three times to set the evap, maybe the purge vacuum eventually closes the vent solenoid. If you have a scanner that allows you to monitor, fill the tank and then see how long it takes for the fuel tank pressure to go negative. __________________ "Life is hard, it's harder if you're stupid" John Wayne

02-07-2016, 03:09 PM	#7
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	fueling in the tune is likely to be off...the maf curve needs adjusting __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)