p0171 P1011 Rough Idle when Temps below freezing. HELP

2885 Views 8 Replies 2 Participants Last post by mikestony, Dec 3, 2017

unitednations161

Discussion Starter · Nov 30, 2017

2011 chevy cruze eco 135,000 milesSo I took my car to the shop and got a smoke test for the p0171 code and +22 LTFT, They found the PCV leaking. My wife went and told them to replace it ( I was sleeping SMH) well $270 later. (it makes me sick over a $48 part I could of did in my sleep). I get the car back. I drive it home around 45 Degrees out, LTFT is staying around 0 to +7. I start it after work, Temps in the 20s it idles like crap, and almost stalls twice. LTFT was at +32 and a pending p0171 code. Drove it home, LTFT was staying around +7, idle after warm up around +6. Got home, tried to see if there was another air leak, I cant find one, after messing around it set of a p1011 code, Im not sure if it was from me. It set off that code once before, but when I reset it it never came back just the p0171. Does anyone know correct MAF readings on the cruze?And any ideas on my Rough idle only on a Very cold temp start, and high LTFT still after pcv was changed?PS Manisfold does have the orange check valve present.

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unitednations161

Discussion Starter · #2 · Dec 2, 2017

Freeze frame report generated by Torque for Android
=========================================================

Vehicle Manufacturer: Chevrolet
Vehicle Calibration ID: 126

Freeze frame information:
------------------
Fuel Status = 0 byte
Engine Load = 70.98 %
Engine Coolant Temperature = 219.2 °F
Fuel Trim Bank 1 Short Term = 0 %
Fuel Trim Bank 1 Long Term = 33.594 %
Fuel pressure = 61.351 psi
Intake Manifold Pressure = 17.695 psi
Engine RPM = 2,132 rpm
Speed (OBD) = 68.972 mph
Timing Advance = 2.5 °
Intake Air Temperature = 48.2 °F
Mass Air Flow Rate = 30.15 g/s
Throttle Position(Manifold) = 50.98 %
Run time since engine start = 419 s
Fuel Level (From Engine ECU) = 90.196 %
Distance travelled since codes cleared = 23.612 miles
Evap System Vapour Pressure = 0.25 Pa
Barometric pressure (from vehicle) = 14.504 psi
Catalyst Temperature (Bank 1,Sensor 1) = 1,520.6 °F
Voltage (Control Module) = 14.467 V
Engine Load(Absolute) = 103.922 %
Commanded Equivalence Ratio(lambda) = 1
Relative Throttle Position = 37.647 %
Ambient air temp = 44.6 °F
Absolute Throttle Position B = 50.196 %
Accelerator PedalPosition D = 38.824 %
Accelerator PedalPosition E = 19.216 %

End of report.

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unitednations161

Discussion Starter · #3 · Dec 2, 2017

Anything that sticks out besides fuel trim?
P0171 was set

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mikestony

· #4 · Dec 2, 2017

Fuel pressure seems a little high, but then again it appears the throttle was at 50%.

I'm guessing a vacuum leak somewhere. Maybe smoke machine it? (side note, I'm chasing an unusually high LTFT myself and am in the process of making a homemade smoke machine

)

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unitednations161

Discussion Starter · #5 · Dec 2, 2017

How are you making it? I Tried with a hose and a Cigar ( Its rough living in an apartment) But I couldn't see anything. But I did enjoy the cigar.

Fuel Pressure is around 48 most of the time. I must of been going up a hill on the highway when it actually set.

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mikestony

· #6 · Dec 2, 2017

unitednations161 said:
How are you making it? I Tried with a hose and a Cigar ( Its rough living in an apartment) But I couldn't see anything. But I did enjoy the cigar. Fuel Pressure is around 48 most of the time. I must of been going up a hill on the highway when it actually set.

I'm making it out of an empty paint can following the instructions from here:
Make Your Own Smoke Machine - E46Fanatics

with some slight changes

There are also many YouTube videos about it too.

Fuel pressure is the same for me too.

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unitednations161

Discussion Starter · #7 · Dec 2, 2017

Well if I don't get to it until I go back home, let me know what is leaking on your car.

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unitednations161

Discussion Starter · #8 · Dec 2, 2017

mikestony said:
I'm making it out of an empty paint can following the instructions from here:Make Your Own Smoke Machine - E46Fanaticswith some slight changes There are also many YouTube videos about it too.Fuel pressure is the same for me too.

alright thank you

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mikestony

· #9 · Dec 3, 2017

unitednations161 said:
Well if I don't get to it until I go back home, let me know what is leaking on your car.

Will do

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