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Stinks like fish
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johndeesmith said:
Could not replacing a bad PCV valve cause the head gasket to blow in a 2.7?
Having a bad PCV is a signature of poor maintenence. I don't know if it can be directly blamed on the PCV but it could have led to it indirectly. It's such a cheap part and easy to replace once a year. If the motor is less than a year old it is not practical to blame it on maintenance but as the vehicle ages this item is a must to check.

What's the story?
 

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Deal Master
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johndeesmith said:
Could not replacing a bad PCV valve cause the head gasket to blow in a 2.7?
Its a $3 part from Autozone and a ~$7 part from the dealership and requires no tools to change- its too easy not to do.

hard to directly state causation. but
If your crank case cant ventilate propery because of a bad PCV valve- There could be increased pressure resulting in blown seals or leaks
 

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Discussion Starter #4
No excuses. I was unaware the PCV valve was something that needed to be checked frequently. As you can tell, I'm not a tech quite yet. One must learn at some point. Unfortunately, in retrospect it can cost.

So it can indirectly lead to a blown HGasket? How so?
 

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Deal Master
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johndeesmith said:
No excuses. I was unaware the PCV valve was something that needed to be checked frequently. As you can tell, I'm not a tech quite yet. One must learn at some point. Unfortunately, in retrospect it can cost.

So it can indirectly lead to a blown HGasket? How so?
- PCV is a check valve- If you pull the hose off- you should feel negative pressure from the hose. - If the PCV is bad- (ie clogged) - that means the crankcase will not properly ventilate (positve crankcase ventillation valve)-
Poor ventillation = increase pressure/ gases-
That increased pressure has to go somewhere - it can force gases/fluids past seals & gaskets causing leaks.

sounds plausible to me.
 

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More than likely it'll force pressure out the dip stick. Most times when you have a bad PCV you'll see smoke from the dipstick, and the dipstick will mystreiously keep poping up from its retainer clip. If you have a bad head gasket it's more likely you were just unlucky and it was time for it to go.

Tim
 

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95.5 Tacoma
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johndeesmith said:
I assume a bad PCV would cause the "check engine" light to come on?
No it will not. There is no sensor to check crankcase pressure or that the PCV is functioning properly.

As was already mentioned, I doubt your head gasket blew because of a clogged PCV. The pressure would likely blow out the dipstick first before the gasket.
 
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