Random Misfiring(NEED ADVICE)

[VIKTUR]

Hi i driver a Nissan Pathfinder 2006 4x4, noticed it was not running smooth so i had it checked out ,machine reports Random Misfiring and the mechanic advises i change the ECU.

Please advice

[solarman216]

Hi i driver a Nissan Pathfinder 2006 4x4, noticed it was not running smooth so i had it checked out ,machine reports Random Misfiring and the mechanic advises i change the ECU.

Please advice

I do not know anything about the Pathfinder, but most unlikely to be ECU unless it is a known problem ie bad batch of units etc, more likely are the information inputs to the ECU like MAF, Crank position sensor, injector lift sensor etc, Rick

[solarman216]

forgot to say do you have any fault codes? but on a 2006 I am not sure how you read them, Rayf is your man on here, Rick

[VIKTUR]

"I have a 2006 Nissan Pathfinder 4.0 V6... Had ECU replaced . Now is throwing a random misfire code P300... what are these code and can one cause the other? Help!"

[VIKTUR]

thanks Solar man,where Rayf pleaseeeeee

[solarman216]

thanks Solar man,where Rayf pleaseeeeee

he is a member on here, on most nights, rest assured he will see your post, what he does not know about ECU etc is not worth knowing, look in the members list if you want to send him a PM he is rayf3626 or such numbers, Rick

[VIKTUR]

Thanks dude

[jims-terrano]

Why did you have the ECU replaced?

Was the replacement brand new or second hand, is it possible the replacement is not the correct type for your car. As said normally its a sensor rather than the ECU.

Is there a manual in the downloads section for the Pathfinder? Or a manual for another vehicle with the same engine perhaps.

Best of luck

[rayf3262]

The ECU should pretty much be the last item on your check list.
I am guessing that as the fault code (P0300) you have been given is generic EOBD code this check was not carried out by a Nissan dealer?
P0300 is not very helpful as it can be caused by many ancilary items. I'd suggest getting the checked with Nissan Consult diagnostics, this is far more likely to provide a more specific DTC or fault code.
The ECU should pretty much be the last item on your check list.

[VIKTUR]

Thanks Ray and jim,i am just sitting on a time bomb here in Nigeria so difficult to get a proper Nissan dealer.

thank for all the updates,one thing i noticed though,the ECU in the car had 7Z while the new one has BH don know that meant anything anyways.

On the reason why it was changed,long story,some guy messed with the Tube water heat that started pouring hot steam water on the the fuse box and what i was told next was that it short circuited to the ECU and all and all bla bla bla.

so thats were i found my self now,my ride is 3 years ld and never came up with issues just this silly mistake now.

[Sweety]

Yours the 4L V6 petrol ? if it is has the spark plugs & plug leads been changed ? the problem could also be the coil pack

[solarman216]

Yours the 4L V6 petrol ? if it is has the spark plugs & plug leads been changed ? the problem could also be the coil pack

Oh ffs I never imagined we were talking PETROL whole different ball game, did say I know nothing about Pathfinders, Rick

[Sweety]

Oh ffs I never imagined we were talking PETROL whole different ball game, did say I know nothing about Pathfinders, Rick

As the chap is in Nigeria I think his truck & others out there will poss have the US spec engines which are mainly petrol V6's & I think they also get some big diesel engines aswell not the crappy 2.5dci lumps we get:doh oh & then there is all the Nismo upgrades to:bow:bow (only know this from being on a US forum)

[VIKTUR]

Hey Sweety,very on point,my truck is US spec engine which are petrol V6' and also the spark plugs just got changed.

Could that be the cause?

[rayf3262]

Your mech. gave you a DTC of P0300, when this code is stored the will also be another stored DTC indicating the cylinder that caused the issue.
P030X where X indicates the cylinder number.
There will be multiple entries for each cylinder if needed.

[VIKTUR]

Gosh!cylinder nowwwwww

[VIKTUR]

Gosh!Cylinder noowwwww

[rayf3262]

Gosh!Cylinder noowwwww
????? can you explain please...

[VIKTUR]

Just tired of getting different reasons.

[rayf3262]

Your diagnostic report showed a stored DTC of P0300.
This indicates a misfire.
If you drill down further into the stored DTC's you should have a stored code of P030x. X will indicate the number of the cylinder or cylinders that misfired, giving you a clue as to where to focus your attention.
eg. if it is persistently P0304, then the misfire is on number 4, could be a lead, plug coil etc..

[VIKTUR]

rayf cool,my mechanic tells me number 1,3 and 5 cylinders that misfired.and really does not have clue as to what caused it.

Your thought please!

[rayf3262]

rayf cool,my mechanic tells me number 1,3 and 5 cylinders that misfired.and really does not have clue as to what caused it.

Your thought please!
Without looking at the workshop manual, I would take a guess that the coil pack arrangement could be as a pair, with one coil for 2,4,6 and the other for 1,3,5. There must be some common denominator for the odd numbered cylinders....
You indicate that the spark plugs where recently changed, could it be a man made fault!

[VIKTUR]

Man made fault,hmmmmmm,please explain further rayf,this sound interesting

[Banshee]

Man made fault,hmmmmmm,please explain further rayf,this sound interesting

I think he means that the fault may have been caused by "man" the fact that your misfire has only just started since the spark plugs have been changed