I'm getting a spark and fuel but my 79,460 engine in a motor home will not start.

campingguy, September 2008

I had the some thing going on it drove me nuts. I checked everything I could get spark a fuel. But it just would not start. What I found wrong, I found a loose wire that was grounding itself on the manifold. I was not getting the full fire to the coil. That's what made me look for a wire.

same problem, June 2010

The next items to check would be compression and timing. Fuel, spark, compression and timing should get the engine running, maybe not great but running none the less.
For compression, I recommend removing all sparkplugs and using a screw-in type compression gauge. Sea level air pressure times compression ratio will give a close p.s.i. rating. The most important item to check is that all cylinders are within a 20 psi range. If one or more is out of range, you likely have internal mechanical damage.
Timing comprises two aspects: crankshaft/camshaft timing and spark timing. Basic crankshaft/camshaft timing can be accomplished by removing the valve/camshaft cover and rotating engine by hand. A worn belt/chain can change timing enough to stop an engine from running. Spark timing is set with a timing light. Remember, incorrect crank/cam timing will change spark timing. Resetting spark timing will not solve crank/cam timing.
I am not writing this to be a complete answer. I only want to give you areas you should check or research if you do not understand. Good luck.

leroy, September 2008