stalling out when warmed up

[MCluvsacj5]

My cj 5 starts great when cold but when warmed up to running temp stalls out, let it sit for a few (15) minutes will fire right up again.
It's a 304 with edelbrock hi rise, 625 carter afb (rebuilt last year) & a healthy cam. I have added a 1" phenolic spacer under carb, new ignition switch, new plugs & wires, installed a new module in the DUI distributor, even new electric fuel pump. Can't drive 2 miles w/o
it stalling out. Can someone please help ?

 

[xt master]

Have you checked your oil and radiator fluid to make sure there not mixed.could be a bad head gasket that starts to warp when warmed up.

Jeep! not just a vehicle a way of life.

 

[TerryMason]

Clogged up cat?

 

[MCluvsacj5]

Have you checked your oil and radiator fluid to make sure there not mixed.could be a bad head gasket that starts to warp when warmed up.

Jeep! not just a vehicle a way of life.

Yes I have checked those too, oil is clean as is the coolant. Could it be vapor lock, how do I check that ?

 

[MCluvsacj5]

Clogged up cat?

It's a 1974 so no cat, only headers & loud mufflers. Also no smog equipment.

 

[JPNinPA]

Does your fuel line run over an area that heats up. When the engine heats up it could vapor lock. You could temporarily use tinfoil as a heat shield. Or Reroute the line.

Is the fuel pressure constant through the cool hot period?
Regards,
JPNinPA

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[MCluvsacj5]

Does your fuel line run over an area that heats up. When the engine heats up it could vapor lock. You could temporarily use tinfoil as a heat shield. Or Reroute the line.

Is the fuel pressure constant through the cool hot period?
Regards,
JPNinPA

Sent using TapTalk

Sometimes it seems like it runs out of gas, I will investigate that next. Thanks for all the responses
I will keep you guys informed with my progress
maybe this will help someone else with similar problem.

 

[HexedHero]

Sometimes it seems like it runs out of gas, I will investigate that next. Thanks for all the responses
I will keep you guys informed with my progress
maybe this will help someone else with similar problem.

I have a 95 and I have the same problem except it’s even more bizarre. The first thing I thought to replace was the crankshaft position sensor in the bell housing, did that, also replaced the ignition coil to be safe. Thought it was all and good when I figured out that my old sensor was melted and it started right up after a quick unplug and reset it recognized the sensor and all was good. But now it doesn’t seem heat related. I let it idle til it got hot and then drove it around a little and it seemed like exactly after 3 minutes of very casual driving it stalled. But started right back up afterwards. Can not be a fuel issue, I just replaced fuel pump 2 weeks ago before putting a new tranny in last weekend. And it ran fine up until I put the new tranny in. At this point I’m at a loss and have no idea what I’m to do about the stalling. It could possibly be a grounding issue but I’d already gone over all the grounding points and made sure they were all good, if something were also loose I’d think it would stall when I U-turned and dipped off the road a little and not stall on the smoothest part of the road.


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[ndnatty]

I hate carbs, only because they can be a challenge to tune since I ain’t no mechanic. So I put a Multiport fuel injection on my 304. Now before that I wrestled with the carb set up some of the things I ran into was not making sure the fuel going in was filter first, idle jets are small and clog up so when warm will cause stalling. Also not having a good gasket on the carb base and tightened well can cause a leak once warm. Not sure what to advise about the distributor as I tossed the old points for the new electronic ASAP.


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[Gennybro]

Do you guys realize you are responding to a post that is 2 yrs old and there is no one on the other end, :lol: . Ive done the same thing.

 

[JPNinPA]

Well the one has a similar issue.
Likely searching for the fix. And tagged onto this.

To HexedHero
Crank sensors CKP usually have a paper gasket that gets peeled off on startup. It’s there to space the sensor from the flywheel. If reinstalled its likely damaged by the flywheel..

Use OEM sensors.


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