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Help PO325 code questions


befries
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So today I went ahead and replaced the valve cover gasket passenger side only at this time, went smooth no hiccups until driving to work I lost some power and it started miss firing, and the power seems to come in waves one second it's struggling the next it's fine, so I took it to the zone and the only code present was the PO325 code for knock sensor, any one have experience with this code? I already ordered parts to do the job, any inputs would be awesome, already checked connections. :-)

 

 

1997 Pathfinder

 

 

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I've changed my Knock sensor, its not a particularly hard job, but time consuming, took my buddy and i about 4-5 hours.

 

Just get a Hanyes or whatever you want manual, it will clam your nerves as you go along and prevent the "do i have to take that off" debate.

 

The last intake bolt that connected to the timing cover is really stupid, stupid location, stupid reasoning, stupid everything.

 

Other than that, its pretty straight forward, get new gaskets, a decent knock sensor so you don't have to do that again. Thats all i can think of...

 

Post up if you have any issues, like i said its not hard just takes a while.

 

-Kyle

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Before you do that pull your distributer cap and look for red dust. That sounds more like you distributer causing issues. If there's a ton of red dust. Take off the internal cover and check if your coil is grounding to the housing. That's what mine ended doing. Because of the miss fires it will throw the knock sensor code.

Oh and check that all your connections on the passenger cover are seated good and your plug wires.

 

Sent from my Moto X

 

 

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The knock sensor code is generally a symptom, not a cause; that is what it is there for.

 

Since you just changed a valve cover gasket, look for cause and effect. I'd bet because it is intermittent, it is electrical (mechanical doesn't fix it's self). You probably disturbed some of the wiring/connectors for the injectors, coil and a few sensors when you changed the gasket. Check whatever wires/connectors you moved/disconnected for any corrosion or loose pins/wires. Don't be afraid to drive, stop, wiggle a connector, drive, repeat as needed. If you mess with everything at once, you'll never know what it was if it goes away...

 

A friend was over doing some work on his WD21, and I showed him the coolant temp sensor and wiggled the connector. The truck was warming up before he left, and when it reached ECU closed loop operating temp, it died like Elvis on a toilet and wouldn't start again. We took that connector apart, cleaned and tightened the wire/pin contacts, reinstalled it and it fired up perfectly and has been running fine for 9 months...

 

B

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Alright so todays chore list was, plugs wires filter,added a thing of Lucas injector cleaner, going to still be doing cap rotor when it arrives, but the one I have looks great, cleaned throttle body and all connections, had to have it towed this am because it just lugged so bad, mechanic read the same two code P0325 (knock) and P0300 random multiple cylinder missfire. Still acting the same even after it's first tune up. Mech said everything is oem at 246 =-O. Any guidence appreciated.

 

1997 Pathfinder

 

 

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Posted Image

 

 

Thoughts? I replaced it of course, so I re thought it, right before I did the valve cover gasket I had just filled my tank from just a hair above E, my fault. I also am remembering a slight hesitants getting on the freeway minutes later from filling tank.

 

1997 Pathfinder

 

 

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"Check Items (possible cause)" from page EC-255: amongst others are Incorrect Fuel Pressure and Lack of Fuel.

 

That came out of your fuel tank? :blink:

I'd consider draining the tank, or at least look into it. Do the R50's have the same access port in the cargo area?

How does it run now?

 

B

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Right now to this point I've done a complete tune, plugs wires, cap and rotor should be here today, filters motorvac service, cleans fuel rail valves, cylinders, exhaust the works, and still is doing the same.

 

1997 Pathfinder

 

 

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Wouldn't hurt just to clean it, its a 6-9$ dollar bottle of cleaner that can only improve how the car runs (given you do it right).

 

While it could be the MAF, whats more likely is what others have mentioned, or a sum of all these worn our parts you are replacing, contributing to poorer running engine. Either way, your rig will be up to date on maintenance for a while.

 

-Kyle

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That makes sense once it goes into closed loop, so it is a sensor/ECU related thing...

Honestly, did you ever go through the trouble shooting diagnostic in the FSM?

 

B

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