Blown Head gasket

Some do, some don't. My first 5VZ had an EGR (which ended up getting a crack in the head/heads), and the current one I have now, doesn't.

That being said, all this talk about deleting the EGR causing too much heat for the engine to handle, doesn't make much sense to me.

 

What does the oil look like?

 

Clean because I had just changed it. Before it was darkish. Not milky.

 

The EGR recirculates exhaust gases back into the combustion chamber. This is 2 fold. 1 part is it recirculates the exhaust so it burns every last part of any fuel that may not have been burned the first time. The second is when combustion temperatures reach 2500F during combustion NOX gases are formed. This is the worst form of pollution so to reduce it the added in exhaust gases. This means there's less fresh air for the engine to burn during combustion meaning a smaller amount of combustion which produces less heat so NOX gasses arent formed.

 

So they take a tiny bit of exhaust gas ....reburn it....and thats supposed to clean the other 95% up magically...

 

I highly recommend Tony at Freer’s auto in Escondido. Great shop and 100% fair.

Tell him Dave with the Tacoma sent you. He should be able to give an estimate based on the info you have already

 

Yep. The big thing is the combustion temp being below that 2500F for the NOX. That was the big emission killer.

 

I understand how it works, but if the same engine literally comes from the factory in a version without the EGR system, then obviously Toyota thought it could handle it just fine. Deleting the EGR puts you in that same boat.

 

This was my problem and I ended up getting new heads. Was expensive but it buys another 200k at least motor wise if your up on your oil changes. For reference I paid 5k out the door for new heads and quite a bit of other things refreshing the engine water pump etc.

 

All those blown head gaskets would tend to disagree with that...

You know .....they thought the frames would be fine toooo..

How did that work out.................


They are not gods......they are just trying to make an honest buck....

 

That's somewhat irrelevant, because that problem exists mostly due to the walls in the heads being too thin between the valve seats (which has been yacked about tons on TW). So that would happen either way. Like I said above, it happened to my 5VZ that had an EGR on it.

I won't argue that the EGR lowers temps, but ultimately the thermostat regulates the block's temperature. The bottom line is that deleting an EGR on a 5VZ is NOT going to cause heat issues.

 

Like I said the 5vz is a different animal....

for the 4-banngers the two inner cylinders is right where most gaskets fail...
over and over and over again....



And the failure is almost always on the exhaust header side......

And they dont fail when they are newer.......its only after 120K or so...
about when cooling and egr system is aging...

 

And the heads are a complete mess.....why anyone would put a factory head back on is beyond me...

 

What's the alternative?

 

Yeah there arent many...unfortunately...

I lucked out and found an aftermarket head that promised to be a thicker cast....

I've got almost 17K on it.....will see how it goes...

I got it from these guys 3 yrs ago.....

https://www.ebay.com/itm/313443600979