Few days ago I finished build my engine VQDE 2004-standard setup cp pistons, BC rods, revup cams exhaust and intake revup oil pump greddy tt 18g on Haltech but not pnp Yesterday I started breake in engine and everything was ok maybe oil temperature little to high 230*F I didnt cross 4500 rpm so this is strange Today I observed that one side EGt jumping to 2400*F when I let off gas pedal When gas is pressed both egt gauges are close in range 750*F - 1000*F when I starting brake by engine the driver side EGT is going up even to 2400*F for 10 or 20s I dont hear any sonds from exhaust so indjectors on both sides are closed What can be the reason for this EGT problem and how to solve it?

 

"EGT" usually means "exhaust gas temperature". "cc" usually means "cubic centimeter", which is a measurement of volume, not temperature. Anyway, the following link (if the website does not block the entire URL) has some information about what is normal for EGT:

http://forums.nasioc.com/forums/show....php?t=1918028

 

The one side must not be cutting fuel. Only fuel can increase it...

During decel timing drops to 0 degrees or less and if there's fuel that explains the crazy EGT.

 

That was my first idea but If it would be fuel I should hear explosion in exhaust and AFR would be lower ? This egt jumps even when car is standing and there is no pressure.

 

There is a problem with your sensor. 2400F would melt things quickly. Swap the sensor inputs on your EMS and see if the issue is swapped as well.