Jump to content


Photo

2003 blowing blue smoke


  • Please log in to reply
28 replies to this topic

#21 OFFLINE   Rebelord

Rebelord

    NPORA Old-Timer

  • Members
  • PipPipPipPipPip
  • 1,054 posts
  • Local time: 02:55 PM
  • Location:Miami
  • Country:
  • Model:SE
  • Year:1999

Posted 20 August 2013 - 06:42 AM

If you have a smart phone with bluetooth. Check out the Torque App. Works with bluetooth OBDII adapters. The app costs $5 and the adapter costs about $20-35 on Amazon. 

Its what I use and works very well. 

App: https://play.google....wl.torque&hl=en

Adapter: http://www.amazon.co...=bluetooth obd2



#22 OFFLINE   Slartibartfast

Slartibartfast

    NPORA Old-Timer

  • Topic Starter
  • Members
  • PipPipPipPipPip
  • 2,864 posts
  • Local time: 11:55 AM
  • Location:Eastern Washington
  • Country:
  • Model:SE
  • Year:1995

Posted 11 January 2014 - 02:45 PM

One of my cousins uses Torque and he seems pretty impressed with it. If I ever replace my flip phone I'll have to check it out.

 

The consumption's getting worse. About 1100 miles after an oil change, it came in more than two quarts low. :ohno01: Dad's priced a new engine (more than he wants to spend on this thing), and a rebuild would cost more due to the shop time involved in getting into the heads. I'd love to have a go at it but it's way beyond my skill level.

 

The crazy thing is, it still has plenty of power and drives fine. :scratchhead:

 

My research suggests that the later 3.5s (05-06) didn't have this problem. Does anyone know if these mate to the R50 Pathfinder trans?

 



#23 OFFLINE   5523Pathfinder

5523Pathfinder

    Now you have forced me to remove my pants!

  • Members
  • PipPipPipPipPip
  • 6,680 posts
  • Local time: 11:55 AM
  • Location:Rochester, WA
  • Country:
  • Model:SE
  • Year:1995

Posted 11 January 2014 - 06:15 PM

Sounds like you need to pull the intake yourself and check those power valve screws. If the were loose, the original guy should of checked for damage to the intake itself. Kind sounds like damage to the cat converter to me. Being when you perform the reset and everything works fine for a few, something is telling the computer to do something it's not supposed to. No codes tells me something mechanically failed. You could pull the plugs and do a compression check to see of the rings are worn(May also need a leak down test). If they were low, you could put a small amount of ATF down the cylinders to help reseat the rings. Me? I'd pull the intak and check the screws myself, then pull the cats and inspect them to see if the are coming apart.

#24 OFFLINE   Slartibartfast

Slartibartfast

    NPORA Old-Timer

  • Topic Starter
  • Members
  • PipPipPipPipPip
  • 2,864 posts
  • Local time: 11:55 AM
  • Location:Eastern Washington
  • Country:
  • Model:SE
  • Year:1995

Posted 11 January 2014 - 11:42 PM

The throttle flapping's long since solved, it just needed a new swirl control solenoid valve solenoid something or another. Are you suggesting the cats in relation to that or to the oil consumption? I've read about Maximas with the smaller VQ sucking bits of catalyst into the cylinders (some kind of passive EGR via the exhaust valve timing) and destroying the bores/rings, but I've never seen it mentioned in relation to Pathfinders. Doesn't mean it's not possible though.

 

We haven't checked the compression or valve screws on it, mostly because it looks like we'd have to remove an awful lot of stuff just to get to them, and it's Dad's daily driver so it can't be torn apart for long. However, the possibility of the rings sticking is interesting (and not unlikely of the PCV's been dumping oil into the intake). I found a post on a VW forum from a guy who said that filling his cylinders with carb cleaner, letting it sit a while, and then pumping it (out along with gobs of carbon) fully stopped his oil consumption. We'll have to look into that... it would be nice if the problem's that easy to solve.

 

In case it isn't, any pointers about how to find a good replacement?



#25 OFFLINE   5523Pathfinder

5523Pathfinder

    Now you have forced me to remove my pants!

  • Members
  • PipPipPipPipPip
  • 6,680 posts
  • Local time: 11:55 AM
  • Location:Rochester, WA
  • Country:
  • Model:SE
  • Year:1995

Posted 12 January 2014 - 08:32 AM

As far as the converters, what happens is that they begin to crumble, or a screw makes it through the cylinder and embeds itself into the cat, and it no longer works properly. In doing this, the o2 sensors read incorrectly. They tend to fatten up the mixture and wash the cylinders, loosing compression. Usually the giveaway is that the oil smells like fuel. Yes, I've have done hundreds of Altima and sentra motors for this same problem. I have also replaced several cats on G35's who collapsed and created the same issue( replacing the cats usually fixed it). On those, the PVC system is built into the valve cover gaskets and they would stick open and suck the oil down. Replaced the valves over gaskets, spark plugs and performed a induction service and got them to reseal the rings and stop oil consumption. I know it sucks, but ya gotta take some things apart and inspect.

#26 OFFLINE   Towncivilian

Towncivilian

    The Lubeman

  • Members
  • PipPipPipPipPip
  • 2,067 posts
  • Local time: 02:55 PM
  • Location:Palm City, FL
  • Country:
  • Model:SE
  • Year:2001.5

Posted 12 January 2014 - 12:06 PM

You don't have to remove too much crap to at least examine the power valve screws, just the upper intake manifold. If you are flexible enough maybe you can even apply threadlocker to all of them without removing the LIM; I knelt on the radiator core support to do so but I'm a small person.



#27 OFFLINE   Slartibartfast

Slartibartfast

    NPORA Old-Timer

  • Topic Starter
  • Members
  • PipPipPipPipPip
  • 2,864 posts
  • Local time: 11:55 AM
  • Location:Eastern Washington
  • Country:
  • Model:SE
  • Year:1995

Posted 12 January 2014 - 09:30 PM

The clogged cat theory sounds good. Is there some special OBDII test that could verify this via O2 readings or increased fuel delivery? We'll do a smell test on the oil and see if we can detect any gas. Dad suggested having a used oil analysis done to confirm blow-by, but given how much fresh oil we're adding, would the oil stick around long enough to be worth testing? Given that the cats run about a grand just in parts we'd like to be sure they're the problem before buying new ones.

 

I've heard of the Maxima guys punching out their cats and putting the second O2 sensor on a spark plug anti-foul spacer to make the computer think everything's normal. We have no emissions testing around here obviously, and given how much oil's going through this thing I'd be surprised if the cats aren't in a bad way already. Even if the computer threw a low catalyst efficiency code, would that make it quit dumping gas?

 

I would like to check the valve screws just to be sure. Two questions on that. First, if we pull off the upper intake and find bits missing, should we assume the motor's shot? And after checking/loctite, can we get away with re-using the gasket? If we do solve the oil consumption it'll likely get new intake gaskets and a new PCV just to be on the safe side, but until we know there's hope for this engine we'd rather not throw new parts at it.



#28 OFFLINE   Towncivilian

Towncivilian

    The Lubeman

  • Members
  • PipPipPipPipPip
  • 2,067 posts
  • Local time: 02:55 PM
  • Location:Palm City, FL
  • Country:
  • Model:SE
  • Year:2001.5

Posted 15 January 2014 - 08:31 AM

Used oil analysis won't detect blow-by.

 

I'm not sure about your second question.

 

The gaskets (TB, two UIM gaskets) are supposed to be replaced per the FSM, but they are metal-backed so if they're in good condition I can't see why you couldn't reuse them after cleaning them and the mating surfaces.

 

If one or more power valve screws are missing, there may be engine damage or catalyst damage or probably both since you are consuming so much oil.

 

PCV is buried under the LIM and you *have* to take it off. So if you're tackling the PCV, do the threadlocker on the power valve screws with it off the vehicle so it's much easier.



#29 OFFLINE   River044road

River044road

    NPORA Regular

  • Members
  • PipPip
  • 70 posts
  • Local time: 12:55 PM
  • Location:United States
  • Country:
  • Model:SE
  • Year:1997

Posted 19 January 2014 - 08:11 PM

It does sound like valve seals, but it seems odd that they'd fail so early. I would also expect it to smoke on cold starts, and it doesn't.

That might make sense though because it takes a while for oil to get back up to valve train.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Welcome to NPORA Forums

Please REGISTER to gain full access to the forum.

Make sure you read the Forum Guidelines and don't forget to post a new intro in the New People Start Here! section, to say hi too everyone.

-NPORA