Hey guys. Needing some help here. Just had my engine rebuilt, but ended up scrapping my 08 3.7 block and was able to find an 07 3.7 block to pair with my 08 head. Issue arose when we reinstalled it and fired her up. Runs perfect for a few minutes until the oil heats up and then it throws a timing code and runs terrible. Sputters almost like it’s going to die, doesn’t, and will do the same thing even when driving down the road. My mechanic has checked the timing, cam phaser, crankshaft/harmonic balancer bolt torque, and the VVT actuator. Nothing seams to help. Hell we even tried a heavier oil. Still does it. I’m at my wits end. Our next step is to get a new cylinder head and see if that helps at all.

 

So if I was to have a 2007 3.7 block and a 2008 cylinder head.. would my motor not jive/work correctly?

 

I was thinking about this aswell good question hopefully someone knows because the top end is good on my motor could use the head if i had to.

 

Thats what I did with mine. I have a 07 block and an 08 cylinder head but we’re running into some issues where it’ll run fine until the oil heats up and then starts sputtering and acting like it’s out of time/stall. Changed the VVT Actuator, torqued the crank shaft bolt, and even tried a heavier weight oil, and still no change. The VVT sprocket/cam phaser is perfectly fine, and it’s still running this way. We’re changing the cylinder head out next week to see if that will fix the issue. Any other ideas would be greatly appreciated.

 

Let's keep this story all in one thread.

Which PCM are you trying to use to control this Frankenmotor?

 

The original 2008 PCM

 

So if I was to use old head new set of 08 timing chains and gears and the old tone ring on the crank Shouldnt it work? Or did something else change with the blocks?

 

Well, we figured it would work but ran into the above described problem. We used the block and crank from the 07 and head from the 08 with all new internal parts. Changing out the cylinder head next week to give it the ole college try.

 

Are you still using the 2007 phaser?

 

2008 phaser