Oh-Oh's, I Think I Broke It!

[tuckdaddy]

Saw you took it to Toyota of Boerne haha a couple fo my buddies up there sent me all sorts of pics telling me mine should look like this! Hope they get you taken care of man! Dont know who you talked to but Joe and Mike are really good about getting stuff done up there in the service department.

[celica73]

Originally Posted by mad_sb

Probably did a quick compression test.. bent or damaged valve will also show low / no compression... I would bet on that over a hole in the piston.. Pre Ignition is what causes holes not detonation, detonation causes cracks and missing chunks. I have read though that DI is prone to carbon buildup which can lead to pre ignition if there is enough of it..

If they went through the trouble to pull the plugs (the hard part) and do a compression test, it's about 1 more minute to put a camera in there and look around.

[Surok]

I hope you can get it sorted soon buddy. best of luck.

Best of luck to OP!

Kinda got really lost/confused on all the talk of oil on page 4. Not trying to thread jack just curious what all the numbers in the oil stand for and how to figure out what means what and how it relates to fat tires and outside temperature. I'm really noob to this kinda stuff. If someone would be willing to send me a PM or just reply i'd be thankful for it!

[mad_sb]

Originally Posted by celica73

If they went through the trouble to pull the plugs (the hard part) and do a compression test, it's about 1 more minute to put a camera in there and look around.

Agree, but not many dealerships i have seen have a bore camera.

[avp1]

Originally Posted by pcasso87

Ok guys well according to a toyota tech one of my pistons has a huge hole, my ecu could also be faulty which could have caused the engine to fail. I will have more information today or tomorrow. This is extremely weird, i really cant explain it my self. Hopefully the tech will diagnose it better so we can have a better idea as to what failed.

Likely it was a result of detonation caused by wrong settings in ECU. When you try to squeeze last drop of power this is what happens. When you alter factory algorythm, you should alway run car with datalogger and review collected information periodically. Otherwise you never know what in that change caused failure and why

[FirestormFRS]

Random internet speculation: Advanced timing fault code+hole in piston=Piston contacting valve leading to hole. I'd ask the dealer to replace the entire engine.

Holes in pistons mean debris in the engine. I've seen dropped small parts in an engine manage to migrate to every cylinder and destroy multilple parts.

[xwd]

I would tend to agree. Detonation can cause holes in the pistons but with all of the VVTi related codes I think it's more likely there was some valve to piston contact from the timing being off due to other issues. Would love to see pictures of the damage though.

[robispec]

Originally Posted by FirestormFRS

Random internet speculation: Advanced timing fault code+hole in piston=Piston contacting valve leading to hole. I'd ask the dealer to replace the entire engine.

Holes in pistons mean debris in the engine. I've seen dropped small parts in an engine manage to migrate to every cylinder and destroy multilple parts.

random experiance..first time a valve contacts a pistoin the stem bends and that hole stops running very well.. = no compression...only time I have seen a hole in the piston and a valve contact issue is when the valve head breaks off and makes the hole in the pistion.

Robi

[roddy]

Holed pistion are usually caused by very lean A/F mixtures or detonation (though detonation is more often the cause of cracks than holes). If valve contact caused a hole, there will me much more damage than "just" a hole in the piston. JMO.

[Sportsguy83]

@pcasso87 updates????

[Touge Monster]

Good luck keep us posted

[rice_classic]

I've had lots of overly lean problems in the past, a hole in the piston was not one of them, but that's not to say that ain't it. I had cracked ring lands (twice), blown head head gaskets, warped heads, melted pistons (side melted down losing compression), detonation leading to deterioration of head (then to blown gaskets).

When I've had a hole in a piston (twice) it was caused by 1: lost a valve and 2: nodes of the Bosch +4 spark plug came off in cylinder and that was that.

I'm really curious to see how this plays out. I also hope pcasso is on the receiving end of some good customer service.

[King Tut]

Originally Posted by mad_sb

I have read though that DI is prone to carbon buildup which can lead to pre ignition if there is enough of it..

We have DI and port injection, so carbon build up is not an issue. I had my intake manifold off last week, and the valves looked great at 8,000 miles.