High Oil Consumption - Nissan Forum

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#1 Old Feb 11th, 2012, 04:57 AM
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Unhappy High Oil Consumption

I have a 2992 Pathfinder 3.5 SE with 130,000 miles. It began using oil suddenly to the tune of 1 qt/1000 miles. I've changed the oil and filter regularly (10w30) and there is no evidence of leakage or smoke out the exhaust. The spark plugs are clean, compression is very good across the board and there are no "trouble" codes. I have replaced the PCV valve and R/H valve cover thinking the internal PCV baffles might be plugged. The PCV hoses are clean and there are no screws missing from the power valve butterflies. There is evidence of oil in the intake manifold and upper and lower plenums. This tells me there is a backpressure problem. Could I have a catalytic converter that is plugging up and still not setting a code? If not, does anyone have any other ideas?
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#2 Old Feb 11th, 2012, 10:08 PM
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Quote:
Originally Posted by pathological View Post
I have a 2992 Pathfinder 3.5 SE with 130,000 miles.
Dear Mr. Future Man,
Can you tell me where people of your time have found new sources of raw petroleum based products?

Thanks...
Mr. Present Day Guy

99% of the questions that are "STRANGE" have a dirt simple answer...usually answered by a dirt simple search.

NISSAN GOOGLE

Is it just me, or does the majority overlook the obvious?

Somebody ate a whole bag of dumbass for breakfast.

Why do people continue to run a vehicle when a warning light comes on or starts flashing? Isn't that a clue that something is wrong and you probably should NOT drive it?
Is this whole car driving thing really freekin' brain surgery?

Here's something new for the crowd/clowns...
"A little bit of Google goes a long way!"

Ever notice the one post wonders for info on turbo'ing a GA16 are never heard from again after they figure out the cost???

And if you can read this, you don't need glasses! :)

And yes, I am diggin' it...
#3 Old Feb 11th, 2012, 10:48 PM
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I have heard of issues with the rings in the VQ35DE's. The cylinder bores apparently have been designed with a slight taper and the secondary compression and the oil rings don't properly tension against the bore, causing the oil burning issue. Updated rings address the issue, but, of course, that requires tearing the engine apart.
#4 Old Feb 12th, 2012, 06:04 AM
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Dear smj999smj thanks for ignoring the obvious typo of the model year of my Pathfinder. It is a 2002. I did a compression check and got 170 to 180 psi across the board. The book says a normal max pressure should be 178 psi, and that's without squirting oil into the cylinders. That tells me I don't have a broken ring or cylinder wear, but I could be wrong. If I had a plugged converter this could cause backpressure and push oil into the intake, but I am not setting a trouble code and would this account for this much oil consumption? This oil usage didn't happen gradually. Normally the engine would use 1 pt of oil between oil changes (2500 miles). Then suddenly consumption increased to 1 qt/1000 mi. I'm trying to convince myself that it's not a ring problem.
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#5 Old Feb 14th, 2012, 09:01 PM
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If your converter was plugged your gas mileage would be in the gutter....
All the VQ Oil consumption issues from rings I know of were mainly on the rev-up Engines, and when tracked over 50K miles the Oil consumption decreased.
The VQ is not a particularly good on Oil, I get 2-3 K per Quart.
That being said it does sound like a blow-by issue or Oil being sucked into the intake.
as anyone removed the intake ?

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#6 Old Feb 15th, 2012, 06:00 AM
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I have had the upper and lower plenums off as well as the intake manifold and saw nothing abnormal except oil in the intake and plenums. I do all of my own work on various cars in my "fleet" so I'm kinda familiar with the way things should look and this isn't right. The reason I questioned a partially plugged converter is that I feel power is down slightly and so is gas mileage (from 20 mpg highway to about 18+). Not a lot but still a difference. I'm not excited about changing out converters but I'm also not excited about doing a ring job.
I just recently got a pending MIL code for sensor bank 1 sensor 2 for the aft O2 sensor. It hadn't turned on the light because it was a stored pending code. It hasn't as yet repeated itself in about 50 miles. I know that the downstream sensor checks the condition of the converter, along with fine tuning fuel. sooooo--WTF? over
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#7 Old Feb 15th, 2012, 12:15 PM
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I asked that question because I had two separate V8's that had this same issue, they were sucking Oil into the intake from the Oil gallery. The Fix was some serious application of gasket compound, this fixed it.
Like you I do nearly all my own work, and I agree it doesn't sound like a typical problem.
How about putting a catch can on the breather and seeing if it is coming from there?

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#8 Old Feb 15th, 2012, 12:16 PM
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BTW I have not had this engine apart so may be completely misleading you

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#9 Old Feb 15th, 2012, 12:22 PM
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re: sensor2 code,
I had this on my IS300 with 145K and did not see any reduction in mileage, in fact I think its pretty good, not much worse than the SER w/2.0 in town, about 19 vs 21 mpg with same commute, and same on the highway, 26 -27 mpg on longish trips. Did not change the CATS....I used an O2 cheater to remove the code, and passes inspection here in Texas.

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#10 Old Feb 18th, 2012, 05:16 AM
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This problem started with the engine never having been apart from factory new so I don't think a bad gasket could cause the problem of sucking oil from the oil gallery. Furthermore, there is no oil gallery on this engine in the conventional sense. It's not like an American made V8 with a big ole intake manifold. When I removed the intake and plenum I was careful to clean off all old gasket material. The surfaces were clean and smooth when the new gaskets went on and all bolts were torqued 'by the book", but the problem was still the same.
Using a 'catch can' on the vent hose is a good idea but unless I'm misunderstanding you all this will tell me is that I have blowby. It won't tell me the reason (whether it's from a restricted exhaust or bad rings).
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#11 Old Feb 18th, 2012, 08:44 AM
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I had a 4.0L H.O. Jeep Xj Cherokee, my oil consumption was more evident... any hoses coming from valve covers or going to the Air intake (starting at the air filter if there are connections there) could have baffles in them. On my Jeep these baffles were inside the valve cover. They were badly clogged and this created an oil pressure issue in which it sent pressurized oil through another tube to my air filter box. My engine ingested oil this way until I tracked the issue down. But this is "one" way oil can get into the intake.
#12 Old Feb 18th, 2012, 12:14 PM
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Quote:
Originally Posted by pathological View Post
This problem started with the engine never having been apart from factory new so I don't think a bad gasket could cause the problem of sucking oil from the oil gallery. Furthermore, there is no oil gallery on this engine in the conventional sense. It's not like an American made V8 with a big ole intake manifold. When I removed the intake and plenum I was careful to clean off all old gasket material. The surfaces were clean and smooth when the new gaskets went on and all bolts were torqued 'by the book", but the problem was still the same.
Using a 'catch can' on the vent hose is a good idea but unless I'm misunderstanding you all this will tell me is that I have blowby. It won't tell me the reason (whether it's from a restricted exhaust or bad rings).
I agree, but its still worth checking all the hoses for blockages and any possible causes, the alternative is expensive.

Next I would investigate what test pipes are available to replace the Cats, you probably have 3, same as my IS300.

As you can tell i haven't had much in the way of issues on my Pathy except for the weird loss of power after a hot soak in the summer. happens 1 -3 times a yr since i got it. Its not the fuel pressure regulator, next is check of swirl valves for evidence of jamming. No codes, dealer couldn't find it when it was under warranty and i took it in there with the fault. Idiots turned it off and it recovered by the time they started it.

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold

Last edited by IanH; Feb 18th, 2012 at 12:31 PM.
#13 Old Feb 18th, 2012, 12:29 PM
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I had a 5.0 Chevy that had a blocked CAT, mileage went to hell, dropped to 70% approx.
came back as soon as the one cat was replaced with test pipe. No problem noticed with Oil consumption, but was relatively low mileage engine and Chevy was not that good anyway. I have doubts that a blocked CAT would do this.....?

2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!!
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold
#14 Old Feb 19th, 2012, 04:46 AM
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Not that I'm trying to hijack my own thread, but your hot soak problem could be a weak fuel pump. Sounds like a vapor lock problem we used to have on some cars with carburetors. If your fuel is vaporizing after a drive on a hot summer day, underhood temps would soar after you shut the engine off and airflow under the hood stops. Now if you had a marginal fuel pump it may not be strong enough to deliver enough fuel pressure to push past the vapor lock. Whatever fuel it is delivering would eventually cool the lines and the vapor lock would disappear. It may also be a partially clogged or collapsing fuel filter, though that's unlikely. The fuel pump could also be binding under certain heat conditions and not delivering enough fuel until the incoming fuel cools it down. Just a few thoughts.
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#15 Old Feb 19th, 2012, 04:59 AM
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My car has two cats and I've already checked pricing at RockAuto on line. Prices for replacement cats aren't that bad, but still I hate like hell to just "shot gun" the problem and buy two new converters without being sure that's the problem. By the time I located cheater pipes and bought them, they probably wouldn't be much cheaper than new cats, and then what do I do with the downstream O2 sensors? If I replaced the converters instead of using cheaters this would also keep the Feds happy, for what it's worth.
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