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Salutation, having one car problem to another. I have a 1997

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Nissan Pathfinder 3.3 with a...
Salutation, having one car problem to another. I have a 1997 Nissan Pathfinder 3.3 with a P0300 multiple misfire code. It chugs and buckles under low load from 1000 to 2000rpm, thats when the engine light flashes and therefore throwing a p0300 code. I
already replaced the distributor, spark plugs, and egr valve. Still having the same symptons. Please help.
Submitted: 2 years ago.Category: Nissan
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Answered in 2 hours by:
8/15/2015
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20,971
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you!

When I see a P0300 or a P1320 code with a running issue, that is a Distributor issue. If you replaced the Distributor with one from your local auto parts store, they never work right. You would need to get a distributor from the dealer. Also, if you changed the spark plugs, make sure you used NGK spark plugs. These engines don't like any other brand spark plugs, especially Bosch!

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. I hope I have provided you with Excellent Service.

Thanks Jay!

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Customer reply replied 2 years ago
Hi Jay, distributor is from original oem from the dealer, and sparks plug are indeed NGK.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Wow, and you still are getting those codes.. Did you change the spark plug wires also?

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Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Did you change a Knock sensor or something also?

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Customer reply replied 2 years ago
It runs good. Just buckle and misses on low rpm. Spark plug wires are original oem. Knock sensor been replaced also from previous owner.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Did you just get this truck? How long has it been running like this?

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Customer reply replied 2 years ago
Checked compression and is all good on all cyonder 170 all across.
Customer reply replied 2 years ago
Been running like this for a year, since the last owner. I even checked timing belt alignment, all looks good.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Ahh.. ok.. So it's been that long.. Do me a favor. Go on the passenger side of the trucks engine. There are two 02 sensor connectors. I have seen when doing a knock sensor these can get crossed. When they get crossed, it runs like crap!

You can either simply try swapping those two plugs, or go tell me the wire colors to Bank 1 Sensor 1 02 sensor wire colors are so I can see if they are plugged in right for you.

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Customer reply replied 2 years ago
Bank 1 sensor 1 is blue/white, purple/green, black, and black/white.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

1 sec

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Customer reply replied 2 years ago
Are they air fuel ratio sensors or just oxygen sensors?
Customer reply replied 2 years ago
Could it be the fuel pressure regulator or dirty injectors?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

02 sensors. A/F sensors came out in 06 or 07 Pathfinders.

That is Bank 1 Sensor 2 02 Sensor. Follow that down and make sure it's on the passenger side

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Customer reply replied 2 years ago
It is on the passenger side and after the catalytic converter
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

That is correct. So the rears are good.

The only other thing that I have seen is a clogged up Catt restricting exhaust flow. That won't allow the engine to breath right and can cause Misfire codes as well.

Has that been checked?

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Customer reply replied 2 years ago
How can I check if the catalytic converter is partially clogged?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

The only real way is to drop the exhaust to inspect it.

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Customer reply replied 2 years ago
What do I look for in the catalytic converter?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

What I do is remove the front 02 sensor, and shine a flash light into the exhaust and then look on the other end where the 2nd pre-catt bolts to the catt and see if I can see light shining though.

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Customer reply replied 2 years ago
How many catalytic converter does this truck have? Are they common to clog up?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

You have 2 primary that are monitored that bolt right off the exhaust manifold. Then you have two pre-catts that are not monitored.

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Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

It's not to common. but when I see these trucks with high mileage it can happen

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Customer reply replied 2 years ago
you don't think the fuel pressure regulator is bad?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

That is not common. You can certainly check fuel pressure. You should have 36 psi of pressure. These trucks didn't have to may fuel pump issues.

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Customer reply replied 2 years ago
This truck only has 140xxx miles....could TPS to give false reading?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

I don't know why everyone jumps to think TPS. These TPS's never fail! I mean in my 20 plus years working for Nissan, I can't tell you how many I have working on and I think I can count on one hand how many I have seen go bad. I have replaced more after market ones that were installed cause people think it goes bad and just changes them.

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Customer reply replied 2 years ago
Oic, so basically if the cats are good, any other places that can be the culprit. Am just spending to much money on this Truck and can't even smog it.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Well you want to start from the basic's.

First checking fuel pressure if you like. Also make sure the fuel filter is good and not clogged. That is located above the rear diff.

Then if you have access to a scanner, monitor fuel trim readings and graph 02 sensors and you maybe able to see if the catt is clogged or not based on the front 02 sensor readings.

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Customer reply replied 2 years ago
If b1s2 and b2s2 readings are zero during idle and low rpm. Could that be a bad cat, even though it doesn't through any cat codes.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

They will read zero, but should switch every so often then go back to zero

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Customer reply replied 2 years ago
Fuel filter was replaced earlier today...b1s1 and b2s1 also has zero reading at times.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Oh.. They should never be Zero.. The only time I normally have see the front 02 sensors flat line is when a after market MAF sensor is installed. They tend to never meter air properly and can flat line 02 sensors.

Do you know if it's oem or not?

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Customer reply replied 2 years ago
The MAF looks old, but it is oem..
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

If you are building to much back pressure due to clogged catts, the 02 sensors won't read any flow which can make them read steady and zero, cause they can't switch rich to lean

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Customer reply replied 2 years ago
Hi Jay, I checked the catalytic converters and they are good. I even dropped them down and startEd the truck, and it still have the same symptons, this time I can hear it pop and buckles between 1k-2krpm. Check engine light flashes to as misfire.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

That sound almost like a bad MAF sensor based on the rpms your telling it's bucking at

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Customer reply replied 2 years ago
I replaced the afm earlier today. Same symptoms.
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago
Did you replace it with one from the dealer, or after market?
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Customer reply replied 2 years ago
Aftermarket
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago
Is the distributor after market as well?
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Customer reply replied 2 years ago
The distributor is oem
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Well I certainly am not a fan of after market parts, so it's good you put a OEM distributor in. How ever, after market Maf sensors never work right. If you even get one that meters air properly it will flat line 02 sensors and cause running issues. So that may not have helped your situation.

Do you know if this had a engine put in?

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Customer reply replied 2 years ago
I don't know if this engine was replaced.
Customer reply replied 2 years ago
Could it be possible of bad primary O2 sensors?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Hard to say with out seeing readings. I normally graph these type of issues. You can certainly unplug 02 sensors one at a time and see if the running issue changes at all. Since the truck had a knock sensor done so long ago, and it's been like this ever since, you could have a vacuum leak also. That can certainly cause a misfire also.

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Customer reply replied 2 years ago
Replaced lower and upper intake gaskets. Could a idle control or egr valve be leaky
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Can you grab the EGR diaphragm and lift it and stall the engine when it's running?

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Customer reply replied 2 years ago
It does stall
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Ok, so the Egr is most likely good. The truck idles ruff doesn't it?

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Customer reply replied 2 years ago
A little shakey and studded a lil
Customer reply replied 2 years ago
I noticed when its cold, it's smooth and once it heats up, that's when it acts up and misfire code comes up
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

Think you can take a video clip on how it idles and revs up. Also span over the 02 sensor connectors on the passenger side. It sounds so much like the could be backwards, but based on the info, it does't sound like they are.

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Customer reply replied 2 years ago
I noticed they aftermarket o2 sensors. Should I get original primaries o2 sensor, they are the most important ones right? Not the secondaries
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

As I said, I am not a fan of after market electrical parts cause they never work right and can have you spending money on things you don't need to spend time or money on. So I would certainly work on putting as much as you can back to OEM.

I would certainly put OEM sensors in and I would make sure the MAF sensor is OEM also.

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Customer reply replied 2 years ago
The primary o2 are the important ones right?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

They are all important.

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Customer reply replied 2 years ago
Hi Jay, am still on this truck. I checked the compression. Bank one has the highest compression at 190psi each cylinder, but bank 2 has 155, 155, and 160. Can that cause the low rpm misfire?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

The compression should be all around 5 PSI from each other, which is what you have. But bank 1 has that to high. Did you check compression with the fuel pump fuse removed?

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Customer reply replied 2 years ago
I removed the distributor plug only
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago
You need to disable fuel when you do a compression check. Failure to do so, the fuel will still get into the cylinder and it will wash out the cylinder walls which will lower compression.
You want to do a cylinder leak down. That is what you will need to do
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Customer reply replied 2 years ago
How would I do that? Just say the compression is where they are on both banks, would that cause the misfire?
Nissan Mechanic: Jay, Nissan Technician replied 2 years ago

You can have compression, but have a bad leak down. This sounds like something that will require more hands on to determine with a scanner.

I will re-open this question back up to see if anyone else can help you with this.

Please do not reply as it would take it out of Que..

Thanks Jay!

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Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20,971
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Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer

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