a4ls2goat

got this JY build done about a month ago.

mods as follows,

4.8 LM7.
LS9 headgaskets.
LS2 cam.
LS2 oil pump/chain.
Lunati dual springs.
LS1 heads.
2 bar map
walbro pump
Cobra blue giants injectors
Coolingmist meth kit.
GT45 turbo.

I put about 100miles on it and it has ran perfect.
till yesterday, i was on the freeway and as soon as i got off it started running like ****. It felt as it was misfiring, and the wideband was showing lean.
I was able to limp it home. Now it wont start, you have to give it gas to keep it at idle but still dies after a couple of seconds.

Fuel pressure is solid at 60psi, never drops while cranking
spark plugs look good.

so the wideband showing full lean has me at a loss.

any help?

JAX04

iTrader: (17)

what kind of car? the GTO?

Anyway, what was the car tuned with? Any codes being thrown? Still have o2 sensors?

HydroStream6

iTrader: (16)

Boost/vacuum leak.

4.8 is not an LM7 btw

a4ls2goat

I changed the injectors now it starts. But running rough.
It doesn't have any vaccum.

Also. Theirs a lot of pressure coming out of the valve covers. When I take off the oil cap the idle goes up. When I have to crank it a lot it shoots the oil dipstick out.

I'm running a vented catch can pulling from each valve cover.


Any ideas??

Chicago TDP

iTrader: (3)

Sounds like you blew it....

a4ls2goat

Funny thing I never even got on this motor. Not even 1psi. Lol

slow67

iTrader: (2)

Do a compression check to find out which hole is dead.

01M6TA

iTrader: (1)

any update? did you ever have it tuned?