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1983 E350 Air Intake hot air tube not connected


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mylesrobinette
New User

Sep 23, 2018, 2:49 PM

Post #1 of 5 (128 views)
1983 E350 Air Intake hot air tube not connected Sign In

Hi all, I have a 1983 E-350 motorhome with a 7.5L 460 V8. It has Holley 4 barrel carburetor. I took it on a 12,000 mile road trip last year and she did great for the most part - only had to replace a fuel pump along the way.

I'm having 2 issues currently. Sometimes she fires up great, but about 1/10 of the times when I try and start she will crank and crank but never fire. I try hitting pumping the pedal, clicking the key on and off, but she just cranks and cranks with no fire. EVENTUALLY after 5 or 10 minutes of trying there will be a tiny catch, and then a slightly bigger catch, then more cranking, and then finally she wakes up just enough to catch and fire up.

The other issue is that *sometimes* after a few hours of driving, when I slow down, she starts chugging and the engine will die. If I put it in neutral and give a little gas, she wakes up and keeps running but as soon as my foot is off the pedal, the engine will chug and die out.

I noticed that looking through a few diagrams that I'm missing a hose on my air intake. It's the hose that feeds hot engine air back into the engine - at least that's what I think it does. Attached is a photo of the intake and the missing hose, as well as the diagrams for the area.

Can anyone direct me on where this hose needs to be attached to? On the diagram it looks like it goes on the front of the engine, but I can't find a spot where it looks to go. Also could this hose be part of the issues I'm having with a hard start and engine dying? What kind of problems am I having by not having this hose?

Thanks so much for everything, Myles

https://i.imgur.com/xTwmMO2.jpg
https://i.imgur.com/92itCb2.jpg
https://i.imgur.com/pRLl1ty.jpg


(This post was edited by mylesrobinette on Sep 24, 2018, 12:26 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 23, 2018, 7:04 PM

Post #2 of 5 (119 views)
Re: 1983 E350 Air Intake hot air tube not connected Sign In

That is a pre-heat hose that only matters when the engine is cold.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mylesrobinette
New User

Sep 24, 2018, 12:53 PM

Post #3 of 5 (81 views)
Re: 1983 E350 Air Intake hot air tube not connected Sign In

Thanks for the info. I'll get the hose attached!

Could this pre-heater hose help with the crank-but-no-start problem?

Doesn't seem like this hose would matter with the engine chugging when I slow down after a long drive problem. I'm thinking that has something to do with fuel. Any ideas?


(This post was edited by mylesrobinette on Sep 24, 2018, 12:56 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 24, 2018, 1:10 PM

Post #4 of 5 (74 views)
Re: 1983 E350 Air Intake hot air tube not connected Sign In

No, that hose would have no bearing on the engine issues. Most likely a carb problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Sep 24, 2018, 10:17 PM

Post #5 of 5 (59 views)
Re: 1983 E350 Air Intake hot air tube not connected Sign In

I don't see that hose causing a problem. Next time it doesn't want to start remove the air cleaner and open the throttle. Look to see if you see any fuel squirt out of the accelerator pump nozzles. If you don't see fuel spray out, the bowl is probably empty. If fuel squirts out, check for spark.





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