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#4670462 - 02/19/18 05:06 AM My Honda Accord...major blowby..or..? (vid inside)
TurboTravis Offline


Registered: 07/26/07
Posts: 204
Loc: NY
This is my 2000 Honda Accord 'beater' car. The compression, and more importantly, leakdown numbers are excellent-leakdown was less than 10% on all cylinders. However, it blows a massive amount of air from the oil fill. If you can't tell what I am doing in the video, it's holding a paper towel against the bottom of the hood! LOL! (some swearing in the vid, originally made it to show a good friend). I have no idea what is causing this. PCV system is working properly. Take a guess, if it's something I can look at without tearing it apart too much, I will.

Honda

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#4670470 - 02/19/18 05:49 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
skyactiv Offline


Registered: 03/02/13
Posts: 4182
Loc: The Midwest
Really make sure the PCV is up to snuff and the air filter is clean. I suspect you used a junk leak down tester. There are a bunch of junk tools on the market. You need to attach high pressure supplied air to the cylinder through the spark plug hole and than take the oil cap off. Make sure the cylinder your testing is on the the compression stroke. While your at it, listen through the exhaust, open the radiator cap and if you hear air or see bubbles.... .
The engine could run good for another 100K miles+ that, who knows.
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Me: 13' VW GTI 3 door 6 speed manual

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#4670485 - 02/19/18 06:30 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: skyactiv]
TurboTravis Offline


Registered: 07/26/07
Posts: 204
Loc: NY
Originally Posted By: skyactiv
Really make sure the PCV is up to snuff and the air filter is clean. I suspect you used a junk leak down tester. There are a bunch of junk tools on the market. You need to attach high pressure supplied air to the cylinder through the spark plug hole and than take the oil cap off. Make sure the cylinder your testing is on the the compression stroke. While your at it, listen through the exhaust, open the radiator cap and if you hear air or see bubbles.... .
The engine could run good for another 100K miles+ that, who knows.


I know how to do a leakdown test and have the proper tools to perform them. In fact, I have tools for performing a leakdown test that most do not (screw in whistle for indicating compression stroke, spring loaded screw in TDC indicator, etc). With that said, I may change out the actual pressure gauges (or swap them around at least) on my tester just to ensure the equipment is in good operating condition.

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#4670492 - 02/19/18 06:41 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
skyactiv Offline


Registered: 03/02/13
Posts: 4182
Loc: The Midwest
I would just keep driving it and not worry about it if it drives good and doesn't belch out smoke.
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4670502 - 02/19/18 06:57 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: skyactiv]
TurboTravis Offline


Registered: 07/26/07
Posts: 204
Loc: NY
Originally Posted By: skyactiv
I would just keep driving it and not worry about it if it drives good and doesn't belch out smoke.



I agree on all counts! Not worried at all, it's just fun to try to figure it out (without tearing anything apart besides normal service procedures).

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#4670506 - 02/19/18 07:12 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
Tman220 Offline


Registered: 09/20/16
Posts: 141
Loc: MN
Most inline 4 cylinders will pulse an alarming amount of air out of the fill cap when running. This is usually normal and nothing to be worried about if it's not displaying any other indications of engine issues.

I'll bet if everyone on this forum pulls the oil cap off their inline 4 cylinder engine while its running will find there is a lot of pulsating air escaping. Stop worrying.
_________________________
2012 Regal GS Turbo PP 5w30
1994 Camaro Z28 LT1 355 CI, 430 RWHP PP 5W30

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#4670532 - 02/19/18 07:50 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
bullwinkle Offline


Registered: 10/09/04
Posts: 7486
Loc: Cincinnati, OH, USA
How's the oil burning? If it's not spewing blue clouds all over the place, I wouldn't worry about it too much. If it was really bad, it would be puffing out clouds of smoke out of the oil fill like a steam engine!
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#4670587 - 02/19/18 08:26 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
CT8 Offline


Registered: 10/09/14
Posts: 10580
Loc: Idaho
A TDC whistle !!!
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Artificial intelligence is no match for natural stupidity, we shall prevail

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#4670686 - 02/19/18 09:53 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
andyd Offline


Registered: 09/25/04
Posts: 6894
Loc: Marshfield , MA
Coupla times I have forgotten to put the filler cap back on. It takes only a 100 miles to trip the low oil level light. A qt low. OHCs thrash oil compared to rocker arms
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#4670868 - 02/19/18 12:43 PM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
dbias Offline


Registered: 12/24/14
Posts: 122
Loc: USA
Most 4 cylinders do blow air from the oil fill hole. Nothing wrong at all. Nature of the beast.
_________________________
2011 VW JETTA Castrol Edge 0W-40
2012 FORD TRANSIT CONNECT Castrol Edge 5W-20
2016 HONDA CIVIC COUPE Castrol Edge 0W-20
2017 AUDI A4 Ravenol SSL 0W-40

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#4670871 - 02/19/18 12:44 PM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: Tman220]
dbias Offline


Registered: 12/24/14
Posts: 122
Loc: USA
Originally Posted By: Tman220
Most inline 4 cylinders will pulse an alarming amount of air out of the fill cap when running. This is usually normal and nothing to be worried about if it's not displaying any other indications of engine issues.

I'll bet if everyone on this forum pulls the oil cap off their inline 4 cylinder engine while its running will find there is a lot of pulsating air escaping. Stop worrying.



Sorry for my post....you beat me too it.
_________________________
2011 VW JETTA Castrol Edge 0W-40
2012 FORD TRANSIT CONNECT Castrol Edge 5W-20
2016 HONDA CIVIC COUPE Castrol Edge 0W-20
2017 AUDI A4 Ravenol SSL 0W-40

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#4670986 - 02/19/18 02:38 PM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
LeakySeals Offline


Registered: 02/18/11
Posts: 6521
Loc: Hudson, NH
So.. you performed the leakdown test with the cap off?
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06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L Unknown miles ST HM 10w30

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#4671310 - 02/19/18 07:27 PM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
bulwnkl Offline


Registered: 02/09/05
Posts: 1713
Loc: Arizona
Curious: If you are confident of the leakdown test, what is the mechanism you propose which explains the "massive amount of air" expelled through the filler cap?

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#4671514 - 02/20/18 02:27 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2328
Loc: Balearic Islands , Spain
All, all the 4 cylinders i've had blow quite a bit air from the fill hole with the engine running, including my recently acquired Escort, don't know why, my other V6 engined Ford doesn't blow any at all.

I made this video last week, engine running hot, you can see the oil mist and air escaping through the fill hole in the video, excuse the valvetrain noise, Ford CVH engines tend to have worn cams and lifters and this is not an exception, runs great though smile

https://www.youtube.com/watch?v=PjL2VCbH5rU
_________________________
1975 Ford Capri II Ghia 3000 V6
1988 Ford Escort 1.6 Xr3i Convertible
Finnish expat living in Spain
My clothes smell like 15W-40 HDEO and 20W-50.

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#4671742 - 02/20/18 10:05 AM Re: My Honda Accord...major blowby..or..? (vid inside) [Re: TurboTravis]
KrisZ Offline


Registered: 12/23/06
Posts: 7296
Loc: Toronto, Canada
Is there any type of rocker cover vent tube on this engine or just the PCV?

This might indicate a couple of tight valves. They probably seal ok exactly at TDC, but start to open/close prematurely.
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2015 Dodge Grand Caravan-21k miles.
2006 Mazda 3-155k miles

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