78mc

Ls swap my 1978 Monte and cant get it to fire.
Engine is a 2008 4.8 (LY2)

After completing everything needed to have it run, i tried to see if it will start. Had no spark. Called the tuner (chad). Took the car to him, had the VATs deleted. Tried firing it in their parking lot and still nothing. Check INJ 1 with a noid light. Didn't flash at all. Chad said all the sensors are working and the ECM is doing its job telling the injectors to pulse and the coils to fire.

Went back home, checked every ground, and every single wire for all the injectors and coils. All have continuity and are located in the correct ecm pins and theres ignition power to every injector and coil. Is there a possibility that the ecm is bad? Is the internal grounding for the control wires burnt up? The engine came out of a wreck tahoe. Is it possible something shorted out damaged the ecm?

Any help is appreciated. This issue is holding the whole project back and i havent drove the car for a year and a half. Thanks..

Heres some pics of the car for those who are curious...


this past friday













how it currently sits

2xLS1

iTrader: (25)

I hope (chad) knew he had to do a write entire to disable VATS on that ECM.

LilJayV10

iTrader: (39)

Are you getting an RPM signal when cranking? IIRC VATS disables the fuel not the spark but I could be wrong on that.

My first thought is the crank sensor but I do mainly OEM diagnostic work.

Do you have a scanner or a way to look at any data log information?

78mc

What do you mean? Please example

78mc

When cranking, it shows about 150 rpm. And I don't have any way to data log. The tuner wants to hook his lab scope up and see what's doing on.

eaglegoat

When he disables vats he must do a "write entire" not just a "write calibration".

Is the starter turning the engine over?

78mc

Yes the engine turns over. but im using a standalone fuse/relay box from Current performance. so the starter isnt linked with the ecm.

78mc

The tuner did do a write entire

Joe1967ls

iTrader: (5)

did you check for 12v while cranking?

78mc

Yes and it drops but only to around 11 volts

34fordman

Did you ever get a solution to your no start? I have the same problem as you - thanks

G Atsma

OP hasn't been around here since June 2015. I wish people would check dates....

Joe Necerato

Me too, have the same problem and would love to know what happened

G Atsma

See my post above.

Joe Necerato

do problems expire after time passes? Am i the only one that does a search online looking for help. I never understood people like you who feel so obligated to offer zero. shut off your computer, throw your phone away and disconnect your internet. That would be the best contribution to humanity you could do.

G Atsma

You phrased the question as if you are asking the OP directly.
Now if you had asked if others with a similar issue had a solution, no problem.
I was merely advising that the OP himself has not been here in over 5 years. You will not hear from him.
I did NOT say nobody else could chime in though.
Thicken the skin and thin the skull.