Won't start after it warms up

[Harleyboy1]

Put in a 305 Chevy engine inmy dads Silverado used to belong to grandpa can start it with srater fluid no problem if you don't use it for a few days however after it warms up can't get it to start again not sure if I'm getting enough spark haven't been able to figure out what is going on am completely at a lost still think it has something to do with the distributor any help would be greatly appreciated.

 

[1987 GMC Jimmy]

So after you prime it with starting fluid, it'll run fine? And when it's warm, it won't start? I'd work the throttle after it's been run and look down the throat of the carb to make sure you're getting two healthy, consistent squirts to test fuel arrival to the carb and the accelerator pump diaphragm. I would also take the ignition control module out of the distributor and have it tested to make sure it's not failing. If you end up replacing, go with Delco. Cheapo ICMs are worthless.

 

[82flatdeck]

How does the starter crank? The starters on these trucks are notorious for getting hot and barely turning over once hot. Does it start fine without ether? What condition is the carb in? if not the starter I would move on to the carb needing a rebuild next. That would be my best guess for the culprite. I could be wrong but if starts and runs fine while hot I wouldn't suspect a spark issue.

 

[Harleyboy1]

Starts right up with starting fluid did a carburetor kit on it however didn't change what looks like a diaphragm small cup with a spring around it maybe that's the problem. Think I'll also change the ignition control module had bought a brand new distributor should of put in dad didn't want it said that wasn't the problem .i think it's the carb diaphragmnow and the ignition control module

 

[82flatdeck]

if you are pulling the carb apart again make sure to take carb cleaner and some small pieces of welding wire or something similar and Clean out every little port. Also make sure the carb is tuned properly for that engine. I would suspect a carb issue though.

 

[Cuba]

It very well could be an issue with the diaphragm & spring... at least change the diaphragm (you can reuse the spring) because it could be "pooched" or leaking internally. I find that initially the pressure is higher anyway to compensate for cold starts but gradually comes down. I would eliminate this too. Today's fuel with ether breaks down rubber parts within our fuel systems, like hoses & diaphragms.

If it starts with ether, to me, it's pointing to a fuel issue or lack there of.

If you're getting spark either way, then the distributor is not the case.

What carb do you have? Rochester? So I can have more specific pertaining to your issue

 

[Harleyboy1]

Yea it's a Rockchester

 

[smoothandlow84]

I too would definately suspect the diaphragm in the carb and other carb related/tuning issues. Fuel starvation for sure if starting fluid is required to start. Obviously a priming issue. Keep us posted on your findings.

 

[Harleyboy1]

Will do