K&n air filter for 3l commonrail?

G'day people, i recently bought a K&N filter for my 3L commonrail and it started to power surge. the revs would just drop every 3 to 4 seconds at idle and while driving it was the same. i put the old filter back in and it seems to be fine now, has this happened to anyone else? the K&N was ment for the zd30 so i can't understand why it did this or could it be something else because i also fitted a oil catch can myself btu i am pretty sure it was doing this before that any help would be great, cheers...

Did you take it out of the plastic wrapping and install with all that excess oil on it?? Mine was similar and I took it back out, cleaned it with the K&N cleaner an then lightly (very light) sprayed the under side only with the K&N oil ... has been fine ever since.

Just seems to be too clogged up with the oil it comes with in the wrapping ..

Hope that helps - good luck mate.

did you have the same thing happen with the fluctuating revs?

Yessum boss - but on a petrol (and well before I installed the turbo). It was like the MAF was struggling with having air/not having air and would throw in petrol to compensate ... only assuming something similar is happening with the diesel ...

thats exactly what seems to be happening, so you reckon that there is too much oil if so thats a bloody relief. i was hoping it was something silly like that there's nothin worse than these things happening and then next thing you've got mechanics telling you its the injectors and pump.

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Originally Posted by grimace

thats exactly what seems to be happening, so you reckon that there is too much oil if so thats a bloody relief. i was hoping it was something silly like that there's nothin worse than these things happening and then next thing you've got mechanics telling you its the injectors and pump.

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Not sure what it could be mate, but when I got mine it was pretty heavily laden in oil and essentially, so much so that it couldn't breath (the filter light was going on at about 2000rpm ...

Fingers crossed yours is a similar problem - best to rule that out at least before parting with any hard earned!

Hi All
The CRD does not like aftermarket filters. IMO stay the original equipment. The aftermarket filters could also cause your MAF to fail. This has happened to a patrol owner on another forumn.

just got home from work and put the old filter back in and it still does the same thing so is the MAF sensor cactus? if so how much are they? also where the bloody hell does that live???

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Originally Posted by grimace

just got home from work and put the old filter back in and it still does the same thing so is the MAF sensor cactus? if so how much are they? also where the bloody hell does that live???

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You will now have to clean the MAF with MAf cleaner and try again with the old filter. I think excess oil has got onto the MAF

Also the MAF is just after your air filter on the intake tube. It has two torx screws on it. Size T20 from memory

i shall buy a new genuine filter tommorow and the cleaner also. how much is the cleaner and where do you get it? also thanks everyone for all the info! i also forgot to mention that i fitted a oil catch can the other day myself, i fitted it where the hose comes from the rear of the rocker cover at the rear of the passenger side of the engine and goes to the front. i already had the problem with the surging but i did fit the K'N filter about a week prior and soon after the problem started....

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Originally Posted by grimace

i shall buy a new genuine filter tommorow and the cleaner also. how much is the cleaner and where do you get it? also thanks everyone for all the info! i also forgot to mention that i fitted a oil catch can the other day myself, i fitted it where the hose comes from the rear of the rocker cover at the rear of the passenger side of the engine and goes to the front. i already had the problem with the surging but i did fit the K'N filter about a week prior and soon after the problem started....

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There is a couple of products on the market, I use a CRC one . About $25 from memory http://www.supercheapauto.com.au/onl...39#Description

What ever you get make sure it does not leave a residue. I bought a MAF a while back for $150 brand new but that was very lucky. I think the're around $250-$300

http://www.nissanpatrol.com.au/forum...ng-MAF-sensors . check this post out should help.

Can you clear that up for us.
K&N Filter=light surging for a week----------> Catch can= bad surging instantly?????
That correct?

bought new genuine filter today and cleaned MAF sensor and much to my extreme disapointment problem is still there, any other reason for this?

You could try disconnecting the battery for half and hour, this will reset the ECU.

Do you have any air leaks at your catch can? did the surging start when the catch can was installed? you could try disconnect the catch can.

You may need to check for faulty codes. Do you have a mate close by that you could try his MAF sensor in your vehicle?

was doing this before the catch can instal also no fault codes have come up and don't have any mates with a gu commonrail. also just come back from a diesel specialist MAF could be calibrated to the engine so not sure if you can just swap them over...

I don't believe that the MAF will be calibrated differently or tuned to a specific engine. I replaced mine twice over five years with the old zd30 and they where just Repair by replacement. Can't imagine that the CRD would be any different. Call Nissan up. May sound obvious or stupid but how is your fuel and filter? All your problems seem to coencide with the filter but does not hurt to check your fuel bowl. Blocked filters can reak havock on fuel injected engines be it petrol or CRD. When was the last filter change? Have you checked for water? Also on the fuel rail is a pressure release valve which could be releaving and building pressure over and over. Maybe rip out the Steinbauer and see if that changes anything, I believe that type of module brings up the fuel pressure to get more in (Don't quote me, just think out aloud). If you where worried about the catch can ( some are too restrictive and will create a high crank case pressure and start pushing oil out through your turbo seals) just pull the hose off the input side of the catch can and let it breathe to atmosphere for a bit. It is illegel to run this way but it will tell you if that is the problem.

hi how are ya going ... being a mechanic i would not use a K&N filter due to oil in the filter ... it fouls up the MAF sensor .... ive always used a normal non oiled filter

g'day tenchy, yeah mate not good problem still there i have replaced air filter with genuine nissan cleaned maf sensor is now down on power and using i bit more fuel too. don't know what to do? can't afford to throw any coin at the bitch at the moment (bloody christmas) bah humbug!! i had a "G" scan on it before xmas and no fault codes came up the mechanic said it could be boost leak and wanted to put it on the dyno but again i didn't have the bugs bunny. i have even tryed the deisel injector cleaner and put it in every fill but no good, its doing my bloody head in not to mention my wallet. if any one can help i would be stoked................

I know how the no coin feels .. My clutch burnt
Out a week before chrisse

i put a new clutch in this year also, went with the safari cost me over $2700 ouch!

I have been told on a few occasions that the genuine air filter is the way to go.

Bump - grimace -what happened and what was the outcome please ?

bought an original air filter and did the fuel filter, then just by chance after cleaning the truck after a bit of wheel'n i got the plug wet that goes to the steinbuaer and discovered that the problem was with the harness, not sure what because they never got back to me after replacing it. i don't know why i havn't taken the whole thing off because i am too scared to plug it in and use it because it has been so good without it....cheers....