Question about 2004 GMC Sierra

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5.3 blows dipstick out

Runs rough and blows oil dipstick out

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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.

Posted on Jan 12, 2013

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Posted on Jan 02, 2017

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1 Answer

How can I stop oil from coming from my dipstick?


Depends on the cause.
Blow-by is when oil blows by the rings in the cylinders into the combustion chambers or compression blows by the rings into the crankcase. It can also be caused when too much pressure builds up in the crankcase because of a venting problem.
So blow-by can cause smoke out the tailpipe from oil burning with gasoline, or oil collecting in the air cleaner, or blowing out a seal or other place like your dipstick tube.
If it is caused by worn piston rings, the rings have to be replaced.
If it is a venting problem, you need to open up the vent, like the PCV valve or the air intake port.
If you remove the cap where you add oil and there is a vacuum when the engine is running, the venting system is working. If oil blows out the hole, there is too much pressure in the crankcase.

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1 Answer

What are the sighs of a bad head gasket


there are a few ways that a head gasket can go bad.
1. it can blow between cylinders, which causes rough running.
2. it can blow between water and oil passages, which will either get you engine oil into your radiator or antifreeze into your engine oil. you will be able to see these as light brown froth on the dipstick, or when you open your radiator you will see the froth there too.
3. it can blow from the cylinder to the exterior which will cause rough running again and loud repetative hiss when the engine is running.
4 it could blow from a coolant or oil passage to the exterior, which will cause a coolant or oil leak where the block meets the head.

hope this helps ~ Zach

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1 Answer

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I would look for other leaks. If you are sure it's leaking at the dipstick tube, there is normally an o-ring where the tube presses into the engine. In general, this is an odd place for a leak, as ther eshould be no oil pressure in the pan (where the tube terminates) and unless the engine is overfilled with oil, the tube end shouldn't be immersed in oil to leak. IF there is pressure in the oil pan, that generally indicates bad rings. I have seen engines where the oil dipstick actually pops out of the tube under pressure when the engine is running due to pressure in the oil pan from blow-by at the rings.

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Two possibilities I can think of.. Dipstick not fully inserted... or is it possible that you have overfilled the crankcase with oil??? On my VW, I learned the hard way to take special care when checking the oil level with the dipstick... I had to fully remove the dipstick... clean it off... and THEN reinsert it... and pull it back out.. and then look to get an accurate oil level reading... It must have something to do with how the dipstick tube runs down into the crankcase....

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1 Answer

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I think that sparkplags get wet. Replace it.

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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!)

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2 Answers

1987 Toyota Camry 2 liter engine. How much oil do I put in with a change of filter? Thank you.


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1 Answer

How much engine Oil?


The engine oil capacity of a Daihatsu Sirion, 1000 cc Auto, 1999 is roughly 2.5L assuming the sump was drained and new oil filter installed.
This amount will bring the oil level on the dipstick to the upper line.
As a caution, put in 2L initially, then run the engine for a few moments then switch off. After a few minutes recheck cleaned dipstick level and top up as necessary.

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1 Answer

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Check the oil, make sure it had oil in it.
If they didnt add oil then you could have siezed the engine.
Please get back with your findings on the dipstick, amount of oil, Color, feel.

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