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Case backhoe crankcase blowby and no start - Cars & Trucks

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Time for at least a set of rings.
may as well do the head while it's off.

Posted on Apr 17, 2017

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My 95 gle volvo keeps over pressuring in the motor and oil keeps overflowing from engine oil cap


Could be a plugged PCV (positive crankcase ventilator) valve. Cheap and easy to replace.

Could also be lots of other things such as excessive blowby caused by bad piston rings or a cracked piston or damaged cylinder head allowing compression in one cylinder to leak into an adjoining cylinder.

In any case, don't continue driving until you address this. You could turn a minor problem into the need for a new engine.

Nov 28, 2016 | Volvo Cars & Trucks

1 Answer

Starts fine, rough idle, put in gear wants to stall, seems ok at speed.... today the hose from the pvc valve pop off and car would not start, could this be a bad pvc valve


Not a bad pcv
Sounds like crankcase pressure from cylinder
blowby.
Think you need to have some serious engine mechanical
diagnostic work done.

Aug 03, 2013 | 1999 Ford Windstar

1 Answer

Oil leaking into carb


Oil in the air filter is usually caused by blowby which is oil blowing past the cylinder rings, or a PCV valve that is not working correctly. The crankcase has too much pressure and oil is escaping out to the air filter where the crankcase is supposed to get fresh air from.
If the PCV valve and hose are ok, you may need another engine at some point. The rings and-or cylinders may have excessive wear.

May 14, 2013 | Isuzu Trooper Cars & Trucks

1 Answer

What is the function of a pcv valve in my Kia Sorento?


function for a pcv valve or positive crankcase ventilation valve what the pcv valve does it is a check valve with hoses directing crankcase blowby gases back into the combustion chambers in the engine.

Mar 21, 2013 | 2003 Kia Sorento

1 Answer

PCM Valve inside transmission?


I would try another shop, A PCM Valve is not typically that hard to replace from my experience in older model Fords it sits up on top of the motor near the Crankcase.

The blowby vapors that end up in an engine's crankcase contain moisture as well as combustion byproducts and unburned fuel vapors. The crankcase is sealed to prevent the escape of these gases into the atmosphere, but the vapors must be removed to prevent oil contamination that leads to sludge formation. The positive crankcase ventilation (PCV) system siphons these vapors from the crankcase and routes them into the intake manifold so they can be reburned in the engine.
The main component in the PCV system is the PCV valve, which is usually located in the valve cover. A hose connects the PCV valve to the intake manifold. A second hose between the air cleaner and crankcase or other valve cover (V6 or V8 applications) provides fresh air to help flush the vapors out of the crankcase. Some engines have a separate air filter for the PCV breather hose located inside the air cleaner. The PCV valve is a spring-loaded valve with a specific orifice size designed to restrict the amount of air that's siphoned from the crankcase into the intake manifold. This is necessary because air drawn through the valve from the crankcase has a leaning effect on the fuel mixture much the same as a vacuum leak. So air flow through the valve must be controlled within certain limits. At idle, air flow is reduced because little blowby is produced. When the engine is cruising and vacuum is high, airflow through the PCV valve is at a maximum to purge the blowby vapors from the crankcase.
It's important to note that PCV valves are sized for specific engine applications. The wrong PCV valve for an application can flow too much or too little air causing driveability problems. Varnish deposits can clog the valve, so replacement for preventative maintenance is recommended (every 50,000 miles usually).
Not all engines have PCV valves. Some (like Ford Escort, GM FWD cars with the Quad Four engine, etc.) ventilate the crankcase with a small breather hose and calibrated orifice. There is no spring-loaded PCV valve. On these applications, no maintenance is usually necessary.

All this to say that if this shop does not know this then i would look for another shop. Try going to the Better Business Burea for your area online and check some shops that have beenin business for a while. Also read customer reviews before making a decision and call them to ask some questions to see if they have ever done one of these replacements before.
Hope this helps, Good Luck!!

May 29, 2012 | 2007 Ford Freestyle

2 Answers

WILL THE PCV VALVE CAUSE A CAR NOT TO START? IF ITS GOES WITH OUT GETTING IT FIX WHAT PROMBLEMS WILL IT CAUSE?


The blowby vapors that end up in an engine's crankcase contain moisture as well as combustion byproducts and unburned fuel vapors. The crankcase is sealed to prevent the escape of these gases into the atmosphere, but the vapors must be removed to prevent oil contamination that leads to sludge formation. The positive crankcase ventilation (PCV) system siphons these vapors from the crankcase and routes them into the intake manifold so they can be reburned in the engine.

The main component in the PCV system is the PCV valve, which is usually located in the valve cover. A hose connects the PCV valve to the intake manifold. A second hose between the air cleaner and crankcase or other valve cover (V6 or V8 applications) provides fresh air to help flush the vapors out of the crankcase. Some engines have a separate air filter for the PCV breather hose located inside the air cleaner.
Probably not read above for details.

Feb 08, 2011 | 2002 Ford Taurus

1 Answer

My Hundai Accent GVS has engine oil consumption,also there is change in sound..what's the possibilities?


Most probable is broken piston rings. Depends on the sound. Broken piston skirt can cause a knock and oil consumption. A hole in the top of the piston can cause oil consumption and a rough running engine. Depends on the size of the hole how bad it might sound and run. In either case the crankcase blowby would be pretty good. pull the oil filler cap off while it is running and see if you get any vapor coming out. Vapor coming out is really bad. not coming out doesnt mean there isn't excess blowby as the engine trys to burn it. Of course these are extremes and it could be more subtle then that. depends on how much oil is consumbed and how serious the sound change is. I wouldnt take any long trips in it at this point.

Mar 09, 2010 | Hyundai Motor 2004 Accent

3 Answers

I am geting oil in my air intaket


Check any crankcase venting used on your engine (pcv valve, breather system etc) if any are plugged it will develop positive pressure inside that will drive oil out. If venting is clear, you can have a worn or broken piston ring which will allow compression to enter oil pan which cannot be eliminated by vent system. Generally though you would have plug fouling on any cylinder with that problem. Overall ring wear from time and miles can also contribute to this condition...slight wear in all cylinders can amount to a certain amount of "blowby" which in total cannot be eliminated by venting system. In that case, if condition is not severe, sometimes changing to a high mileage type oil, a synthetic, or using an additive like marvel oil can slow down, stop or slowly reverse some of the problem.
What not to do: Do not use a single grade or heavier single grade oil...in general this will worsen the problem.

Sep 04, 2009 | 2000 Ford F250 Super Duty Crew Cabs

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