This week sucks

"Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car" (pilot-and-car-guy) 10/07/2015 at 12:06 • Filed to: None

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This week sucks.

Yesterday I blew a tire

Today I’m late due to traffic and parking issues.

And my car is being weird again.

It’s burning oil. Replaced the PCV valve (stuck open) and same thing. There’s a second breather hose (no valve) going from the valve cover to the intake BEFORE the throttle body. (see photo) The throttle plate, body, and intake manifold were covered in oil (pcv goes to bottom 1/2 of the intake manifold, not the areas I’ve seen/cleaned.) So that breather hose seems to be sucking a lot of oil from the valve cover in to the intake. I’m also finding liquid oil in that hose, the air hose, and the throttle body, as well as the old stuff. Monday I pulled the top half of the intake manifold, throttle body, air hose, and air box. Cleaned everything out. 3 cans of carb cleaner later, it’s better, runs better, burns less oil. Drive it some more and there’s still more oil. What the hell is going on?

Hose by cyl 1 and oil filler is pcv, hose at the right side is the no valve mystery hose that’s sucking oil.

Highlander-Datsuns are Forever > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:25

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I had something similar happen to an old car. At the end of the day it was oil blow-back from a piston that had a hole in it, that was pretty much the worst case scenario coming to life. There was oil everywhere, it was puking up from the crank case breather back into the air filter, considering there was internal combustion occuring in the bottom end of the motor.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > Highlander-Datsuns are Forever 10/07/2015 at 12:26

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I really hope not. Seems to be running okay except for the weird idle I have to fix. (IACV is lose, stripped bolts, idle is set a bit high)

SidewaysOnDirt still misses Bowie > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:27

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Seems like blowby. Have you checked the compression?

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > SidewaysOnDirt still misses Bowie 10/07/2015 at 12:30

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105-115-110-120

Something like that.

I had between 105 and 120. Don’t remember the exact order.

JGrabowMSt > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:31

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The no valve mystery hose could be a secondary PCV or something similar. I don’t know why else it would go to intake other than PCV.

Are the hoses collapsing while under vacuum or boost (when the engine is idling, are the hoses good, or collapsing)?

That could lead to an easier solution.

How many miles are on it?

It could be either blow by or potentially just general wear and tear and more oil getting past the piston rings than “normal,” but not enough to notice any blue smoke. Or is there blue smoke?

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > JGrabowMSt 10/07/2015 at 12:34

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Wouldn’t think pcv as no valve. Odd.

Hoses are fine at idle, can’t really tell under load.

227500 miles

The oil burning is a cycle. Some days a very fain smell or nothing, others, lots of blue smoke.

The thing that bothers me is the LIQUID oil in the intake.

JGrabowMSt > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:40

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Every car I’ve ever had except for the SL has done that, and the SL is not exactly a spring chicken, it’s got 111k miles on it.

What oil is in it, what’s your oil change schedule like?

SidewaysOnDirt still misses Bowie > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:41

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Hmm, so not blowby. Weird.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > JGrabowMSt 10/07/2015 at 12:42

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Used to use 5w30 had the issue. Went to 10w30 last change (last week) still doing it.

Change 3000 miles or 3 months, whichever comes first. It’s conventional.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > SidewaysOnDirt still misses Bowie 10/07/2015 at 12:43

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That’s where I’m at. It’s coming from that breather hose going from the right side of the valve cover to the black intake hose right before the throttle body. That’s where I’m finding the oil and old oil. It then moves with the air in to the intake manifold and engine.

SidewaysOnDirt still misses Bowie > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:44

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Is there an oil channel near there? Could the head gasket be leaking onto it? Any idea what the oil pressure’s like?

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > SidewaysOnDirt still misses Bowie 10/07/2015 at 12:46

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No idea what the oil pressure is. No oil leaking. It’s getting “sucked” from the valve cover right in to the intake hose. It’s really weird.

Highlander-Datsuns are Forever > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:48

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That compression is very low. Shouldn’t it be 150-170? That being said I had a Datsun 510 that was a 1qt/1000 mile oil burner and it ran like a top.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > Highlander-Datsuns are Forever 10/07/2015 at 12:49

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Not sure the factory compression specs.

1998 sentra.

GA16DE

deekster_caddy > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:51

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Time for a compression check!

Edit - just saw that you’ve done a compression check. Seems low, but even with good compression it could be the oiling rings are gone.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > deekster_caddy 10/07/2015 at 12:52

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Between 105 and 120.

Don’t remember exactly what cylinder had what.

SidewaysOnDirt still misses Bowie > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 12:55

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Well I was thinking that if there was an oil channel near that hose and something obstructing it near that in the head that it could cause the oil to flow or deflect to the wrong place. Just sort of guessing at this point because it doesn’t make much sense.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > SidewaysOnDirt still misses Bowie 10/07/2015 at 13:01

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Yeah. Also the cams look a little beat up, and to my eye, there seems to be more oil than there should be in the valve cover.

deekster_caddy > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 13:15

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I edited with more info, probably at the same time you posted. Could be oiling rings are shot.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > deekster_caddy 10/07/2015 at 13:19

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Any easy test?

Oil only coming from valve cover.

deekster_caddy > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 13:22

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Not really. If you are watching oil/smoke/vapor come out of the oil fill cap at a hefty rate while the engine is idling, good chance the rings are shot. Low compression means that compression is going somewhere, and if it’s not a head gasket or valves, it’s going around the rings. What’s the compression supposed to be in that?

SidewaysOnDirt still misses Bowie > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 13:28

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Yeah, that looks like way too much oil. Maybe the return is being restricted so it overflows out into the hose.

JGrabowMSt > Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car 10/07/2015 at 13:29

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It would be pretty dicey to switch over to synthetic at this point, so I would just keep doing what you’re doing and leave it as is.

Going up in oil weight from where you are could really tax the motor given the mileage, and I’m just going to stick with my answer that you might be looking at one or more oil control rings being worn just enough to let some oil through.

I would check intake gaskets or other intake related parts as well, boots, filters, elbows, etc. My SL had a torn intake boot, but the O2 sensor was taking over and preventing any major issues with fuel or intake, but maybe also check O2 sensors and/or even the cat. Rough idle is either a mechanic issue, which is major, or a sensor, gasket or elbow that’s torn or otherwise letting too much air in after the throttle body or maybe even leaking air somewhere.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > deekster_caddy 10/07/2015 at 13:36

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No idea. It does spew oil and smoke from the filler at idle. Not very much though.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > SidewaysOnDirt still misses Bowie 10/07/2015 at 13:37

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Any idea where that is?

The cams look pretty worn too. The shafts themselves. The actuators look good.

Jake Huitt - Two Alfas And A Nissan, Not A Single Running Car > JGrabowMSt 10/07/2015 at 13:38

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I know the idle issue. Oil is only coming out the valve cover in to the intake through a breather hose. Just don’t know why. I’ll go back to 5w30 next change.