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Have a 2005 Nissan pathfinder that's throwing p0300 code and

Customer Question
I have changed plugs boots...
Have a 2005 Nissan pathfinder that's throwing p0300 code and I have changed plugs boots and coil packs, I am broke down 600 miles from home and short on cash. Need help figuring out
Submitted: 2 years ago.Category: Nissan
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Answered in 3 hours by:
11/19/2015
Nissan Mechanic: camerontech, Auto Mechanic replied 2 years ago
camerontech
camerontech, Auto Mechanic
Category: Nissan
Satisfied Customers: 562
Experience: diagnostic auto tech
Verified

Hi there,

Im cam.

do you have a scanner to view your fuel trims?

I thinking mass airflow sensor issue.

I dont know how its running? but you can unplug to maf sensor and it should still run better if the maf is faulty

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Customer reply replied 2 years ago
Don't have a fuel pressure gauge, but kinda leaning towards fuel pump, any ideas on how to check without gauge
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

unfortunatly no, not acuratley anyways. if there is a valve on the fuel rail you can press it to see if there is fuel there.

kind of a last resort too, you can give the fuel tank a smack with your fist. IF the fuel pump was stuck, this can get it working again, but it will do it again if the pump is weak.

THe biggest info you will need is does it have 1.spark 2.fuel 3. injector pulse

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Customer reply replied 1 year ago
I think itis catalytic converters stopped up now, tried everything else
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

can you explain exactly what its doing for me ?

thanks

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Customer reply replied 1 year ago
When you try to give it has it backfires and I can't get over 40mph, it idles fin with just a slight miss, but won't take any throttle, I checked fuel pressure and it's OK. I unbolted cat's and drove and it ran fine just loud, how can cats stop up all of a sudden?
Customer reply replied 1 year ago
how come 4 cat's on it
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

first ,

they put 4 cats on it for emission regulations. it was probably failing standards, so they just add more.

as for the cats doing it all of a sudden, it shouldnt.... thats the funny part. cats plug over time or at least in a couple weeks witha bad running engine.

did you unplug the mass airflow sensor? sand see if tehre was a change?

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Customer reply replied 1 year ago
unplugged mass airflow and no change, it ran fine until I got fuel last stop them started running like it is now
Nissan Mechanic: camerontech, Auto Mechanic replied 1 year ago

sorry i couldnt help you more.

im going to opt out and another tech sould be able to help you out a little better

cam

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Customer reply replied 1 year ago
Ok
Nissan Mechanic: Jake, Nissan Technician replied 1 year ago
Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 4,020
Experience: Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
Verified

New tech here.

Lets not over complicate this issue.

If you started having a misfire after your last fill up, then you almost certainly got bad gas.

The easy way to check this is too open the fuel feed line and crank the engine and pump fuel into like a large clear mason jar. If you let it sit and the fuel stays a perfect consistant yellow than it's likely normal, but in your case you will probably notice sediment or seperation from the water and fuel.

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Jake
Jake, Nissan Technician
Category: Nissan
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