Rebuilt hemi backfiring through intake

[GustavoF78]

I have a 2006 ram 1500 mega cab with the 5.7 hemi with no EGR. I bought a junk yard motor and took it to be rebuilt at a machine shop. After I installed it I tried to start it but problem is that it wouldn’t. I checked spark and fuel. Both were good. I checked compression and all cylinders had good compression. Engine just turns over and back fires through the intake. I checked timing and both cam and crank marks lined up. Both position sensors are the same sensors used in old motor and all 16 park plugs are brand new Bosch platinum P/N 6711. I desperately need help!!

 

[Mister Luck]

What did did the engine come out of what year for production .
It may be a computer problem not a sensor problem.

“The original Gen III came with NGC, so it had the 32-tooth crank sensor wheel. But Chrysler went to a 58-tooth sensor wheel on the new Hemi because the computer “needed more immediate and accurate information on the position of the crankshaft during rotation” so it could control and coordinate MDS and VVT along with direct ignition and all of the other electronics used on these engines.”

5.7L Gen III Hemi Engine

The original hemispherical combustion chamber engine design was introduced with the FirePower name for 1951 model-year Chrysler and was rated at 180 hp. The history of the Hemi is filled with plenty of memorable highlights such as Richard Petty’s dominance at the 1964 Daytona 500 where he lapped...

www.enginebuildermag.com

PERA'S Core Corner: Understanding Chrysler's Next Generation Controllers - Engine Builder Magazine

Being one of the “Baby Boomers,” I find myself at a juncture in my life where, shockingly, I have adopted much of the same mindset that my father had about change: I don’t like it as much as I used to! Related Articles - The Road to AAPEX Season 2, Ep 8 - The Road

www.enginebuildermag.com

 

[HemiLonestar]

What year did the engine come out of? This smells like you got the wrong generation engine.

 

[GustavoF78]

It came out of a 2005 ram 1500

 

[GustavoF78]

What year did the engine come out of? This smells like you got the wrong generation engine.

 

[GustavoF78]

We have answers. Turns out the cam sprocket sheared off the locating dowel pin on the cam due to the cam being completely stuck. My guess is that the machine shop ****** up the cam bearings.

 

[kirk35]

I would find another shop.