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Back pressure in motor causing blow by - 1990 Ford F350

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My hyundai H100 2.7i engine pushes oil out at oil filler cap. Why?


Here are some reasons ,one of them might apply to yours.
1) Engine blow-by.
This is where the compression of the motor is being lost past the rings and the pistons, which have worn out sufficiently as to cause too much pressure in the crankcase.
Test this by applying a compression gauge to the cylinders.
2) Worn valve guides, or valve seals.
Again allowing pressure in the crankcase to blow oil out.
3) Too much oil in the motor.

Jan 23, 2018 | Hyundai Cars & Trucks

1 Answer

I removed the oil cap and there was a lot of pressure coming out on my 2002 Chevy trailblazer ltz 4200 is that a major problem and also is there a PCV valve on this motor


First, there is a PCV valve, unless someone removed it.
A local car parts store or garage should be able to tell you where it is located.
Second, a lot of pressure ( usually called "blow-by") can be a problem.
Blow-by that is extreme can blow the oil out of your engine whilst you are driving it, and cause motor failure.
I should recommend you deal with the PCV valve first, and be certain the pipes and or hoses are good to it, as this has a lot to do with blow-by.
Other than the PCV system, blow-by can also be caused by worn rings on the pistons or worn valve guides.
God bless your efforts.

Dec 19, 2016 | Cars & Trucks

1 Answer

Rear a/c not blowing cold, front works fine.


If the front blows cold it would suggest that the freon level is ok. However, if the freon is low, it still may blow somewhat cold in the front and less adequate in the back. Have you had the pressures checked to verify the charge is ok? Does the rear fan motor work? There also may be a restriction or defective expansion valve in the rear causing little/no freon circulation. Another problem could be a defective/stuck blend door in the rear causing the cold air to not circulate

Sep 12, 2015 | Cars & Trucks

1 Answer

Bad injector or cracked cup make your semi truck


a bad injector will cause smoke and just ruff idle =unburned fuel, a crack in cup will cause problems loss of compression .releasing pressure back into motor or excessive blow by in the road tube

Sep 11, 2014 | Cars & Trucks

1 Answer

5.3 blows dipstick out


Sounds like your piston rings are bad causing excessive blow-by ...meaning your power is going around your rings and building massive crank pressure and using your dip stick housing as if it were a pressure relief valve ...motor needs to be rebuilt by an automotive machinist.

Jan 12, 2013 | 2004 GMC Sierra

1 Answer

Egr sensor blew dont know where to put the new one


This sounds like a clogged catalytic converter. When this happens, the exhaust gases build up in the manifold and before the catalyst. It is very common for the delta pressure feedback sensor hoses to blow off the tubes. If you have access to any tools, you can remove the oxygen sensor and install a backpressure gauge to verify this issue. If you have more than 5lbs, you have excessive back pressure, caused by an exhaust restriction.

Dec 13, 2011 | 2001 Ford Escape

1 Answer

Why does the oil keep blowing back up the dipstick of my BMW 320D while the car is running?


back pressure from your motor while running. Tip: you should never check your oil while motor is running. You will never get an accurate reading. And never leave the cap on your valve covers off or loose while running your vehicle. It will blow your oil out, then you will freeze up your motor or blow your pistons out. (blow your motor up!)

Sep 10, 2011 | 2008 BMW 3 Series

1 Answer

My 94 tempo has alot of pressure in the motor and it keeps blowing oil out


this is usually caused by blow back from bad rings, or your valves arent seated

Sep 12, 2010 | 1994 Ford Tempo

2 Answers

My 1997 C1500 Chevy vent issue


Your blend door is probibly not moving all the way to vent position.If you put it on vent there is probibly air blowing on floor or defrost.It may also be opening just a fraction and causing back pressure on the blower motor causing the noise.Is there any difference in outside air or recirculate?

Mar 09, 2010 | 1997 Chevrolet C1500

3 Answers

Shooting oil out of dipstick


Your engine breather system is blocked....this means that the only way that the compression caused on ignition that is getting past the piston rings and into the block can escape is via the dipstick tube.
Check breather for kinks and some have filters ensure that these are not blocked

Oct 03, 2009 | 2000 Dodge Intrepid

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