kohl91
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- Dec 24, 2022
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- Buick Ownership
- 2013 Buick Lacrosse
Hello! First time posting on this website..
So I have a 2013 Buick Lacrosse with the 3.6 LFX engine and 92,5xx miles. I've been suffering a pretty steady misfire so I had taken it to a shop and they diagnosed it as a bad fuel injector. The closer I get to the repair the more I begin to question whether or not it's an injector or potentially a bad coil.. Hopefully this isn't information overload!
Anyway, that's where I'd like a second opinion given the scenario.
It's currently throwing these codes:
P0157 - Oxygen sensor Circuit Low Voltage Bank 2 Sensor 2
P0171 - Fuel Trim System Lean Bank 1
P0174 - Fuel Trim System Lean Bank 2
P0300 - Random Misfire
P0302 - Cyl 2 Misfire
P0442 - Evap Leak
P0496 - Evap Flow During Non Purge Condition
The shop believes the culprit is the Cyl 2 injector and the purge valve.
I went to school for automotive, I have a lift, many tools, and I'm more than capable of performing such a repair. I just want to make sure I'm not going to replace parts blind with my fingers crossed that it's the right part. I have seen too many incorrect diagnoses to take this at face value.
So my question for you guys - have you ever had an injector go out? How many miles? I know these are direct injectors so they are subject to harsher conditions but the more I research this it sounds like it's more likely to be a bad coil pack.. I wish the coil packs weren't under the intake or I'd just swap the cyl 2 coil pack around to see if the misfire code jumps from one cylinder to another but I have a hard time buying a new gasket each time I take the intake off. In my estimation I feel like I should need to replace the fuel pressure sensor, spark plugs, and coil pack(s). Being the condition is throwing a lean code on both banks I have a hard time believing it's a single injector causing all the problems. I understand these have a standard fuel pump and a high pressure secondary fuel pump for the higher pressure requirement of the direct injection system. Is there a way to check and see if the high pressure pump is working okay?
Thank you for your time!
So I have a 2013 Buick Lacrosse with the 3.6 LFX engine and 92,5xx miles. I've been suffering a pretty steady misfire so I had taken it to a shop and they diagnosed it as a bad fuel injector. The closer I get to the repair the more I begin to question whether or not it's an injector or potentially a bad coil.. Hopefully this isn't information overload!
Anyway, that's where I'd like a second opinion given the scenario.
It's currently throwing these codes:
P0157 - Oxygen sensor Circuit Low Voltage Bank 2 Sensor 2
P0171 - Fuel Trim System Lean Bank 1
P0174 - Fuel Trim System Lean Bank 2
P0300 - Random Misfire
P0302 - Cyl 2 Misfire
P0442 - Evap Leak
P0496 - Evap Flow During Non Purge Condition
The shop believes the culprit is the Cyl 2 injector and the purge valve.
I went to school for automotive, I have a lift, many tools, and I'm more than capable of performing such a repair. I just want to make sure I'm not going to replace parts blind with my fingers crossed that it's the right part. I have seen too many incorrect diagnoses to take this at face value.
So my question for you guys - have you ever had an injector go out? How many miles? I know these are direct injectors so they are subject to harsher conditions but the more I research this it sounds like it's more likely to be a bad coil pack.. I wish the coil packs weren't under the intake or I'd just swap the cyl 2 coil pack around to see if the misfire code jumps from one cylinder to another but I have a hard time buying a new gasket each time I take the intake off. In my estimation I feel like I should need to replace the fuel pressure sensor, spark plugs, and coil pack(s). Being the condition is throwing a lean code on both banks I have a hard time believing it's a single injector causing all the problems. I understand these have a standard fuel pump and a high pressure secondary fuel pump for the higher pressure requirement of the direct injection system. Is there a way to check and see if the high pressure pump is working okay?
Thank you for your time!
