How do you all test for an intake manifold air leak?
 

What are some of the methods you all use? What do you spray around the manifold, starter fluid(some percent ether), brake cleaner, WD40?



I'd like to be as safe as possible.

Re: How do you all test for an intake manifold air leak?
 

DO NOT USE BRAKE CLEANER---------------- The gas cloud it produces could kill you!!! I've used carb cleaner in a spray can and the little tube pointing it around the flange

Re: How do you all test for an intake manifold air leak?
 

Starter fluid will do the trick to

Re: How do you all test for an intake manifold air leak?
 

the wifes hairspray...and as an added benefit it will hold for hours with a pleasant scent

Re: How do you all test for an intake manifold air leak?
 

WD 40 worked very well for me . Sprayed it between the block and manifold from the top The engine did an instant speed up ..

John in lovely spring weather Suffolk County England .

Re: How do you all test for an intake manifold air leak?
 

WD 40 worked very well for me . Sprayed it between the block and manifold from the top The engine did an instant speed up ..

John in lovely spring weather Suffolk County England .

Re: How do you all test for an intake manifold air leak?
 

you can say that again John :)

Re: How do you all test for an intake manifold air leak?
 

That is the method I have used over the years. Very effective if you have a
vacuum leak at the intake manifold.:)

Re: How do you all test for an intake manifold air leak?
 

I just assumed I had a leak since it felt under powered and I felt a little light headed after driving a few miles. So I just spent an afternoon replacing the gasket. Really isn't that hard. After it was replaced I notice more power and she can drive a little faster.

Re: How do you all test for an intake manifold air leak?
 

Re: How do you all test for an intake manifold air leak?
 

I have tried all of the above methods and the best for me is Blockheads way. No residue, drips, fires.

But unlike Jacks method I would not be caught dead with my wifes hairspray in my tool box! My wifes red nail polish in my toolbox is bad enough. (great for marking objects)

Re: How do you all test for an intake manifold air leak?
 

Look,I'll wear the fishnets but I won't belt out show tunes on demand...nope,not anymore

Re: How do you all test for an intake manifold air leak?
 

Blockhead, what does the unlit propane do? Does the engine speed up if there is a leak?
It sounds like an easy and clean way to test!!

Re: How do you all test for an intake manifold air leak?
 

If you are using a flammable spray of any kind to locate a leak, Rig up a flexible hose for an air intake well away from the carburettor. I use a length of vacuum cleaner hose and duct tape. It doesn't have to be very big diameter - the engine is only idling. You need to draw air from well away from the volatile spray or the carb will suck some in and give a false response. Just my experience.

Re: How do you all test for an intake manifold air leak?
 

Re: How do you all test for an intake manifold air leak?
 

I was thinking about fire risk too. I think I'd opt for a can of WD-40 with a nozzele in one hand, and a garden hose in the other hand. I have been in a fire before, and I tend not to take it lightly.

Re: How do you all test for an intake manifold air leak?
 

Re: How do you all test for an intake manifold air leak?
 

A completely different technique is to use a small diameter rubber hose. Hold one end near your ear and the other at the suspected leak location. If you hear a hissing sound, that is where the leak is.

Re: How do you all test for an intake manifold air leak?
 

Is there a central internet repository for Bob Bidonde infographics? If not, we really need one.

Re: How do you all test for an intake manifold air leak?
 

Try this:

https://www.modelalongisland.com/technical