Silver hose off the base of the air filter?

[WanderingAccountant]

Hi all,

 

I was attempting to diagnose a high idle upon ignition, and discovered that a silver hose connected to the base of my air filter hub had broken in place. I should probably replace, but I can’t figure out what this hose is called, or what better part to replace with. The other end seemingly snakes under the engine and looks very tricky to access!

 

Please help! 

[eaglescout526]

It is an exhaust hose. There is a vac switch right at the intake of the air box that shuts a door and allows the exhaust to send warm air into the intake rather than draw from the freezing cold air upon initial startup and warming of the engine. 

[tugboat95]

Lol. I just replaced mine today. Yours is not factory. Somebody found a duct and put it in. It is a ignition pre heater hose I think. What it does is sends hot air to the airbox to help starting. It is attached to a vacuum switch that operates as needed. At least that's what was explained to me. Look at my photo. I just pulled this one off a junker today and replaced my worn out hose tonight

 

89 Comanche

Eliminator

2wd

4.0L

5 speed PukeGoat

Factory Original

 

 

 

 

 

[eaglescout526]

3 minutes ago, tugboat95 said:

Somebody found a duct and put it in

I don't know, kinda like it. Looks cleaner and less likely to tear and its readily available. 

[WanderingAccountant]

Awesome fellas, thank you!  Anyone know a good replacement part for this?  The only one I could track down is the same flimsy metal coil, and I would rather have something more durable!

 

Thanks you both for your responses.

[Ωhm]

On 3/24/2020 at 12:00 AM, Big Dan said:

I bought a hose from McMaster-Carr.  I think it was 2.5in ID.  One of their blue crush resistant duct hoses.

Quote from another posting.

[tugboat95]

I got lucky and pulled it off a junkyard. Still in great shape I looked at all the local auto parts stores and couldn't find the proper size. I hadn't searched Grainger or McMaster type places yet. But when I was going to get serious about it they were my next places to search.

89 Comanche
Eliminator
2wd
4.0L
5 speed PukeGoat
Factory Original

[Ωhm]

@tugboat95 yeah you got lucky. Even came with that protective wrap for the rubbing point.

[WanderingAccountant]

@tugboat95 that is seriously perfect!  That was my problem; where the power steering system sits rubbed a hole into the cheap hose.

 

@Ωhm that is awesome!!  I measured the fitting and it seems like the 2in would fit better?  Do you agree or am I not considering something?

[Ωhm]

I'd take measurement at the air box. Should/will be the same diameter used on the medal shroud over the exhaust manifold.

[WanderingAccountant]

Very good, ordered some today!  Thanks everyone!

[Ωhm]

One more thing. O.D. of air box is I.D. of hose.

[rmb2485]

Just to clarify, that doesn’t actually send exhaust gas to the intake, it sends warm air from around the exhaust manifold to the intake. It just connects to a flange on the outside of the exhaust manifold.


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