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P0171 and P0300. 04 g35x. Air filter, pcv valve, new plugs,

Customer Question
P0171 and P0300 Mechanic's...

P0171 and P0300

Mechanic's Assistant: What is the model/year of your Infiniti?

04 g35x

Mechanic's Assistant: Are you fixing your G35x yourself? What have you tried so far?

Air filter, pcv valve, new plugs, replaced coil pack cylinder 1, and cam angle sensor bank 1 yes I am

Mechanic's Assistant: When was the last time the filter was replaced? How has your mileage been lately?

Air filter changed about 1k ago, mpg is very bad about 15ish

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Engine code comes and goes on the dash, there is troubles getting the car to start some times and there is power loss some times

Submitted: 8 months ago.Category: Infiniti
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Answered in 1 hour by:
9/26/2017
Infiniti Mechanic: Jay, Certified Infiniti Technician replied 8 months ago
Jay
Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 21,516
Experience: 20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
Verified

Hello my name is ***** ***** thank you for your question.

what brand spark plugs did you install?

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Customer reply replied 8 months ago
Ngk copper
Customer reply replied 8 months ago
All the issues were present before the plus were swapped
Infiniti Mechanic: Jay, Certified Infiniti Technician replied 8 months ago

Is this a coupe or sedan? did you remove the plenum when you did the plugs?

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Customer reply replied 8 months ago
G35x sedan no I didn't remove the plenum.
Infiniti Mechanic: Jay, Certified Infiniti Technician replied 8 months ago

Do you have a scanner that can read fuel trim? Cause one of the codes shows your running lean. Also do you have a Cold air intake or K&N filter?

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Customer reply replied 8 months ago
I have k&n filter drop in filter and 350z intake with plenum spacer. Ran that way for 40k no issues.
Infiniti Mechanic: Jay, Certified Infiniti Technician replied 8 months ago

I understand, but when you have a K&N air filter, and you run the vehicle lean for a long period of time, you can damage valves. That is why I am asking about if you are able to read short term fuel trim?

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Infiniti Mechanic: Jay, Certified Infiniti Technician replied 8 months ago

See it all the time with cold air intakes and K&N air filters. Also plenum spacers. When you are making those type of mods to a car, you need to update the injectors to accommodate for more air.

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Infiniti Mechanic: Jay, Certified Infiniti Technician replied 7 months ago

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please RATE me by clicking the STARS on top of the

page. That is how I get credit for my work. I hope I have provided you with Excellent Service.

Thanks Jay

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Jay, Certified Infiniti Technician
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