Engine swap headaches

[drayc7391]

just replaced my 3.4 in 94 cutlass supreme. It started right up when i finished the swap, but after an hours worth of run time, it will not stay running. It idles rough(500rpm-1500rpm up and down). Right now i cant get it to start. Any ideas? The knock sensor under front manifold is not plugged in, possibility????

[robertisaar]

even though you SHOULD have the knock sensor plugged in since if its unplugged it will usually run like absolute shit with no advance, it should at least start/run.

[drayc7391]

I am a newb to this motor, but pretty interested in figuring this thing out, just to clarify things lol. The knock sensor in the back of the motor is plugged in, but i cant even find the plug end that goes to the sensor in the front, not even sure if it was plugged in on the old motor. Should it have 1 or 2 knock sensors for the 1994?

[drayc7391]

It seems i stepped into a pretty big pile with this car. Car is a 94, motor that came out was from a 96, new crate motor was, from the description, 91-95 had to mill the hole for the cam sensor,although it had the lobed cam already in the carrier ,had to get the right exhaust manifolds, one thing after another.

[91LQ1Lumina]

That does not sound right.

I am fairly sure that all motors 94 and up should have a cam sensor. So if this motor is a 96 it should therefore have a cam sensor, right? Also I think 96 was the year they changed to the new heads, so it should also have oval shaped exhaust ports, as apposed to the D shaped ports on the older motors. I think you may need to find the casting numbers on your engine and ask the board what year your engine really is.


Oops just re-read your post. I would seem that the new engine you have is for a 91-93. Which is why it does not have a cam sensor already in the block. Sorry I can't be of more help.