Looking to buy this van. Good shape but has a issue with turning off and won't start until cooled down.
It has EFI system, not the carburetor

In the seller's words:
"Turns on and runs-recently, maybe having an ECM issue,
you’ll be able to drive it home, just has trouble turning back on when hot- if it sits for a bit it runs good again."

I really like the van. I have a VW Vanagon that did that too. Seemed it may have been vapor lock? Don't know, never figured it out. Could it be that and need to insulate the fuel lines? Or is it a fuel injection issue? Any suggestions? Its really a good van . Owner honest about the issue.
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More info: 1984 Dodge B350 1-Ton frame 360 motor, Has EFI

 

Something is getting hot, and failing. Is that TBI?? I didn't think that came along until 87 or 88.....

 

An 84 would have came with a Carburetor , but would still have an ECM of some sort.
And a mechanical fuel pump mounted on the engine front.

So it could have had an engine transplant/upgrade to a newer engine with TBI , with the matching electronics required.
Would take an electric fuel pump mounted in-tank - to be right

That could be a gamble if it is a conversion someone did , and never got it right.
Would also be challenging in some cases to get correct parts unless the swap is documented.

It would be hard to pass up a fair deal on an 84 B350 in good shape.
but i probably would pass if it has been altered with an engine swap to newer equipment, and having issues.

iirc - 88 was first year 360 EFI and 89 was first year 360 with roller cam & lifters

 

The owner retrofitted it. He talks about putting the carburetor back on. Is it possible it is confusing the ECM

 

Sounds like he is selling it to get it out of his misery.
And no offense, but you dont seem to be an expert trouble-shooter type of mechanic.
Doesn't seem like a good fit for you.

It would have to have the ECM from the EFI vehicle to even have a chance at running at all.
And most likely wouldn't run much without the fuel tank and electric pump from the EFI vehicle also.

The problems may - or may not - have anything to do with the conversion.
But most likely do

It could drive anyone crazy trying to straighten out what he has and hasn't done.
He has probably had enough of it and wants to bail
His disclosure seems pretty admirable

I wouldn't buy it unless the vehicle that supplied the conversion pieces were included - and it was also a Van.
And all the hardware he has removed from the 84 originally was included.
And it was all cheap

 

I know enough about cars having swapped engines in a 1999 Chevy. Learned a lot about the ECM programming and that nightmare. Also still have my 1994 Jeep Cherokee, 4,0L engine. A beast of an engine. Best ever they made. Of course, Chrysler build with using parts whatever they had in stock at the time. And alternators with the Voltage regulator built into the computer. WTH. Grounds are extremely important. That Jeep computer committed suicide when the alternator couldn't regulate with a bad ground. I am not a super mechanic but definitely use manuals and love doing my own work. Currently rebuilding a 1984 Vanagon. Runs great, just time and mileage needs a revamping. I will not say I am a mechanic to ad lib, but sure can dig in and figure out things. That being said, your advice about the conversion and probable engine swap makes a lot of sense when you explain wasn't until later years.
Its a 1984 Dodge B350 1-Ton frame 360 motor. Xplorer class B motor home. I did some searching and apparently it had the 360 motor, Don't know about the EFI though.

 

Could be an issue from him doing the work. Throttle body injection isn't that much different than a carb as it feeds the engine fuel/air. You could go back to a carb or figure out what's going on with the injection. You can run it till it gets hot and fails, Look down the throttle body when someone attempts to start it again. You should see fuel coming out of the injectors. If not you know where to look for the problem.

 

If it has the lean burn system, change it to regular electronic ignition. If it's the regular ignition, fill a baggie with ice cubes. When it won't restart, put the baggie of ice on the brain box. If it starts then, rep;ace the brain box. It's called the engine controller and I've had a couple go bad and fail under heat soal.