Oil/engine problem that may require viscosity....

[txrhino]

Ignition timing can cause this as well

 

[il_signore97]

^And that would be related to the crank sensor as Nickdfresh pointed out. All good suggestions here...

 

[99TA]

i can tell you the a few causes for what you describe. 1 The ignition timing is too advanced as it cranks 2 leaking fuel injectors OR leaking coolant into the cylinders. this will cause hard cranking as the liquids don't want to compress. 3 poor battery and wiring connections or corroded wiring. A quick test with a volt meter should eliminate the wiring or starter as a cause.

 

[jmac]

Originally Posted By: il_signore97
addyguy,

The issue with your hot starting problem could be traced back to the starter. Not that the starter itself is bad, but after a good hot soak for a few minutes, the starter picks up too much heat. Once overheated, it will not be able to properly start the engine, causing symptoms similar to those you describe.

I've seen this happen to a few older Chevy 350's. A friend of mine actually has a motor home powered by a Chevy 350, and you can imagine the heat that it can produce. His problem is so bad that he actually carries a spare starter. If a hot restart is required, a quick starter swap allows him to start the engine with no issues. But after a hot soak, it won't even crank. It will take over an hour of cooling to even get the engine to turn over a bit without the starter swap!

Just a thought - not sure if this is acutally your issue...


This problem was even more pronounced in the Chevy 454 big blocks that were used in C3500's and MH chasis. It was a beast of a motor for pulling but ran so hot that it routinely cooked the starter with location and low air flow contributing as well.