PLEASE HELP! g35 from Hell!
heres an update.
i brought it to danny aka greengoblin. and he did a leak down test. we found something very supportive to my origional theory. bank 1 was perfect showing normal leak measures however bank 2 showed something a bit differant. all the cylinders at TDC were leaking slightly-when pushed a bit passed the mark for TDC for each cylinder, the leak will stop indicating that bank 2 is off timing. possible causes.
the machine shop decked my head to much? the small timing chain on bank 2 is off a tooth, the valve lash can be off on that bank only. this explains why the bank is lean even when the injectors are pushed to 80 % duty cycle on that bank. when boost kicks and the heads become pressurized, the pressure sends all the fuel past the exhaust valves before it can be ignited....
i brought it to danny aka greengoblin. and he did a leak down test. we found something very supportive to my origional theory. bank 1 was perfect showing normal leak measures however bank 2 showed something a bit differant. all the cylinders at TDC were leaking slightly-when pushed a bit passed the mark for TDC for each cylinder, the leak will stop indicating that bank 2 is off timing. possible causes.
the machine shop decked my head to much? the small timing chain on bank 2 is off a tooth, the valve lash can be off on that bank only. this explains why the bank is lean even when the injectors are pushed to 80 % duty cycle on that bank. when boost kicks and the heads become pressurized, the pressure sends all the fuel past the exhaust valves before it can be ignited....
I pulled the car apart and the timing was spot on. I think its a decking issue, I have the head off and the valve lash clearance is very low .241-.279 on intake side and exhaust.
.279-.305 Everything is in the low side and bellow desired spec. Some were in spec but barely. Now I know that decking wouldn't mess with valve clearance but it's defiantly off. I'm replacing both heads and hopefully it will be back in order.
.279-.305 Everything is in the low side and bellow desired spec. Some were in spec but barely. Now I know that decking wouldn't mess with valve clearance but it's defiantly off. I'm replacing both heads and hopefully it will be back in order.
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seagrasser
Zs & Gs For Sale
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Oct 11, 2015 03:27 PM




