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I have had a bunch of codes starting with p0330 replaced one

Customer Question
code swap out for a...
I have had a bunch of codes starting with p0330 replaced one code swap out for a po103 ended up replacing it twice and the electical conector no change started reading buick forums and the map sensor had played a part in several other peoples situations so I replaced that no change then one day it goes back to p0330 Chang the other sensor and conector codes gone great until this morning it's been about 3 days since last gotten a code it's about 43 degrees out side got to start it spit and sputter gave it some gas to try and get it running eventually runs normal check engine light is on again check the code p0171 and p0174 I love this vehicle I don't love the problems I am having with it I have read the service notes from gm and it suggests that it's a fuel injector can't help and wonder if the vehicles computer is on the fritz I rely on the vehicle to transport my 4 kids around we live in North Dakota winter is just around the corner it's an hour drive to get to a dealership need to get this fixed like now I have only had it 4mo
JA: What is the model/year of your Buick?
Customer: 08 enclave cxl fwd
JA: Are you fixing your Enclave yourself? What have you tried so far?
Customer: Yes map sensor mass air flow sensor twice with the conector and both knock sensors and one conector
JA: Does the engine stall right after starting? And what about hesitation or jerking during acceleration?
Customer: No only today it tryed to jerks and has slight hesitation
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not that comes to mind
Submitted: 1 month ago.Category: Buick
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Customer reply replied 1 month ago
I am also getting a service traction control message now as well
Answered in 19 minutes by:
10/16/2017
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago
david craig
david craig, ASE Certified Technician
Category: Buick
Satisfied Customers: 4,030
Experience: owner/mechanic at 3D Automotive
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Hi Im David, thanks for visiting the site. replace the plugs, have a back pressure test done then have a fuel pressure test done. the way its acting and randoly throwing different codes is going to require those tests.

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Customer reply replied 1 month ago
What will a back pressure test show
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

clogged catalyitc converters

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Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

which will cause all kind of driveabilty issues

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Customer reply replied 1 month ago
How likely is it that this is causing all these codes
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

if the cats are clogged or bad it very likely. but wont know until they are checked.

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Customer reply replied 1 month ago
I may have replaced all those sensors for nothing. If those test come out ok what next
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

I dont jump ahead. and, none of those sensors should have been replaced unless they were tested and failed the test.

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Customer reply replied 1 month ago
Ok well I guess we will work on getting these test done
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

and please let me know the results. fuel pressure should be 55-60 with the key on. engine off. backpressure test gauge should be steady and not go over 1 at idle and at 2500 rpm

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Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

hows it going?

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Customer reply replied 1 month ago
Well haven't gotten it into the shop yet we live in nw north Dakota every shop is booked 2wks out at the minimum still have the same issues / codes pulled the front 3 plugs just to check them they have an old gas smell to them think they are the original plugs will try to get it in at Another shop on fri.
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

ok, thank you for the update

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Customer reply replied 1 month ago
i was able to get these readings from the scan tool i have for when it threw the code p0174 & p0171 it stays plugged in and monitors the vehicle not sure if any of this helps vehicle was cold sat over night first start of the dayCommanded throttle actuator: 16.86 %
Accelerator pedal position E: 11.76 %
Accelerator pedal position D: 23.14 %
Absolute throttle position B: 25.49 %
Ambient air temperature: 62.6 F
Relative throttle position: 11.37 %
Fuel–Air commanded equivalence ratio: 12850.2
Absolute load value: 14.12 %
Control module voltage: 14.791 V
Catalyst Temperature: Bank 2, Sensor 1: 1184.0 F
Catalyst Temperature: Bank 1, Sensor 1: 1225.4 F
Absolute Barometric Pressure: 91 kPa
Evap. System Vapor Pressure: -529.75 Pa
Distance traveled since codes cleared: 37.88 mi
Warm-ups since codes cleared: 6
Fuel Tank Level Input: 20.4 %
Commanded evaporative purge: 24.7 %
Run time since engine start: 161 s
Throttle position: 25.5 %
MAF air flow rate: 7.23 g/s
Intake air temperature: 91.4 F
Timing advance: 32.5 degrees
Vehicle speed: 27.32 mph
Engine RPM: 1413.25 rpm
Intake manifold absolute pressure: 32 kPa
Long term fuel trim—Bank 2: 24.22 %
Short term fuel trim—Bank 2: 10.16 %
Long term fuel trim—Bank 1: 24.22 %
Short term fuel trim—Bank 1: 2.34 %
Engine coolant temperature: 168.8 F
Calculated engine load: 21.6 %
Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

LTFT"S are too high and Bank 2 STFT is too high. I dont like the Timing advance either.

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Buick Mechanic: david craig, ASE Certified Technician replied 1 month ago

this is going to have to be hands on. I will open this up to the other techs to chime in. please don't reply back or it will take the question off the board.

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