PONTIAC SLP

iTrader: (3)

Hi , My friend installed his new LS3 engine and put into his 2007 Lumina SS , Well after installing we start up the motor and noticed the both sides headers are running too hot and the color of the headers changed to orange , After that we replaced the seals for injectors and intake and still running same , Car isn't missfiring and the idle is good .

I told my friend maybe you have bad knock sensors or timimg is retarded and has bad spark so what you guys think ?

Thanks in advance

gs462

iTrader: (4)

Glowing headers are usually a sign that the motor is too lean was this motor tuned??

PONTIAC SLP

iTrader: (3)

No yet he didn't tuned .

gs462

iTrader: (4)

I wouldnt run the car too much or drive it till he gets it tuned you may damage something.

mbaker3

Could be too lean or too retarded timing. It might still be burning fuel in the exhaust.

02_CETA_ws6

iTrader: (6)

i just ran into this problem on an older 350, what type of manifolds are on it? that was the problem with ours, cheap headers=800 degree exhaust gas, swapped headers and went to 350 degrees, just something to check, i replaced manifold and gaskets and carb. before i figured it out.

Old Geezer

iTrader: (3)

^^^^^^^^^^^^^^
Huh???

disc0monkey

iTrader: (10)

wheres the timing set at?

02_CETA_ws6

iTrader: (6)

if your responding to my post....... sounds crazy but that was the problem.

Ballzee

iTrader: (5)

+1 here

2kblackgtp

iTrader: (12)

I'd go with too lean as well, get that thing tuned

redtan

iTrader: (5)

Did you put this LS3 engine with its own computer in the Lumina? Or did you just pop it in there with the stock Lumina computer?