No spark in 2, 3, 5, 6

IT is really strange that no codes are showing when it has to have misfires on some cylinders.

What led up to the engine replacement, anything that could have already had those symptoms or was it the typical oil sludge problem they had?

Yes, the car had a rod knock and threw it threw the block

Well after two GM techs come by and looked at my car they said it was the PCM so I bought one only to have the same problem! And less money someone please help!

IF you have anti-theft, the pcm needs to have it programed into it' This is out of mitchell. Do you still get spark on the same cyls or none of them now?

I still only have spark on the same cyls

I still only have spark on the same cyls[/quote:c600111fb1]
I also dont see a light that says theft on dash or alarm ect

I still only have spark on the same cyls[/quote:5c315a4cc6]
I also dont see a light that says theft on dash or alarm ect[/quote:5c315a4cc6]

hello

If I recall right the 2.7 have 6 coils on it
U has to pull wire of each one and check if you have power and when cranking u get pulse
With key on all should have battery power on one of the wires?
And the PCM will ground and pulse the other wire if that is happening the coils are bad if not happening
Trace the wiring and then if all ok and good u can say the PCM bad
Very uncommon but can happen
Check if u plugged the wrong wire in a wrong pluG
It s not a cam or crank u have spark on 2 cylinders
WIRES . COIL PCM

Good luck
Let me know