ls3 GMPP Crate motor first start

[dhutton]

I would not start and run it without exhaust and O2 sensors. Same goes for coolant.

I’m sure there are guys who would, it’s just my opinion.

Don

[XLexusTech]

Originally Posted by dhutton

I would not start and run it without exhaust and O2 sensors. Same goes for coolant.

I’m sure there are guys who would, it’s just my opinion.

Don

of note.. o2's are in headers.. headers are on..

[RdHuggr68]

Started my LS3 crate up for about 15 seconds, 1st time, open headers no anti-freeze. I tried to upload the video of startup but kept saying invalid video. PM me email address and I will send it to you.
Kevin

[214Chevy]

I agree with Don....I'd NEVER!! What's the point? I mean, I get it, I'm as anxious as anyone to start and hear my motor for the first time. But, not anxious enough to mess something up. Probably won't do any harm, but I'm too scared and don't want to find out the hard way.

[dhutton]

Originally Posted by XLexusTech

of note.. o2's are in headers.. headers are on..

O2 sensors will not read correctly with open headers. They will read lean which will make the car run pig rich....

Don

[XLexusTech]

Fill radiator with gravity funnel and just water... then put a pressure tester on it .
Put 10-15 gallons of fuel into the vapor works tank to prime pump.. crack feed line to get Air out.. then allow system to build pressure.. look for fuel leaks..

bring to exhaust shop..

bring home.. and start. (god willing)

FIWIW i am planning for the worse outcome I guess.. my only reason for not putting water and exhaust on .. in just in case something goes wrong.. and the motor needs to come out.. or front end apart.... I had the pan off the water pump and intake all off at some point..

[dhutton]

Isn’t it a little risky to fill with water this time of year? For some reason I thought you were in the northeast.

Don

[RdHuggr68]

Jesus Christ it is not like there isn't any ****in oil in it!!!

[ErikLS2]

There is absolutely nothing wrong with doing this for brief period of time, it won't hurt a thing. I've done it probably hundreds of times. Just don't let the engine get too hot.

I'm a ex-Lexus tech too BTW. Don't miss it.