Valve job needed

[19963.4lsr5]

The higher heat damages the valve, valve seat, and stresses the aluminum. Thus cracks start.. makes sense...

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I think cracks are from detonation or bad casting. All aluminum heads crack between the valves.

With our engine only having one bank and one pre-cat O2 sensor any cylinder with a poor flowing injector will cause the fuel system to add fuel. Sadly it’s adding fuel to the other cylinders to make up for the poor flowing injector. Richening up all the other cylinders in hopes of increasing flow to the one that’s not flowing well.


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[gamefreakgc]

I think cracks are from detonation or bad casting. All aluminum heads crack between the valves.

With our engine only having one bank and one pre-cat O2 sensor any cylinder with a poor flowing injector will cause the fuel system to add fuel. Sadly it’s adding fuel to the other cylinders to make up for the poor flowing injector. Richening up all the other cylinders in hopes of increasing flow to the one that’s not flowing well.


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Yes, many other engines of the same era have a bank one and bank two O2 sensor for a bit more fine tuned fuel injection. I get why they only have one to lower costs but it may come at a price. Thankfully Toyota over engineers almost everything so that if there is problem the engine and drivetrain can take it.

 

[brillo_76]

I guess the rust hits before around here before the power train failures. As I only had 1 transmission fail all these years. [ years ago no filter change nor fluid change clutch scattered ] with 1 engine seize [2002 toyota Camry 4 cylinder had the engine low tension rings that burned oil like crazy suddly at 200k which I didn't catch fast enough. Internal engine sludge from low oil plugged journals and seized the crankshaft.





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