Long project here. Had propane in 02 Dakota 4.7 and it ate the valves. Had the valves and seats replaced, heads rebuilt, block cleaned and tranny inspected. All back in truck now but having strange issue. Have spark and fuel at the plugs, but the engine won't start. It just turns over and over. We have been hunting for some type of electrical issue since the propane system was removed but are coming up empty so far. Any ideas would be appreciated. Thanks.

 

Ok, spark and fuel is present. Which rules out bad coils or fuel pump.

I know that if the PCM isn't receiving a good signal from the crankshaft, or camshaft, position sensor, it won't allow the engine to run.

When putting it back together, could you have screwed something up? (Camshaft/crankshaft not aligned properly, etc?)

I've never really gotten into engine work, so I'm not good with the internals. I do know that when my timing chain/sprokets broke (3.9L), I had a no start condition (obviously, lol). Except I wasn't getting spark (didn't check fuel).

On my 3.9L, since it has a distributor, we were able to tell by removing the distributor cap and verifying no rotation, either the shaft was broke, or the chain was broke. On your 4.7L, maybe you can just remove the camshaft position sensor?

 

let me ask this, if the #1 piston is at top of cyl & the TDC mark lines up with harmonic balancer wouldn't the crank be in proper position & then be ready to set with the cams V8 mark?

 

fire fuel compression. sounds like you have 2 out of 3. takes all 3 to make it run though

 

The timing kit that the machine shop sold us had the wrong sprocket in it for the CAM timing sensor to read. Picked up the correct one and she fired up perfect. This is truly a Happy New Year!!!