Vaccum line leakage

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93maxima - 21 Jan 2007 02:04 GMT

Does any one know if there is away to check the vaccum line leakage?
Any kind of sparay or liquid?

Thanks

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AJ Foyt - 21 Jan 2007 16:22 GMT

> Does any one know if there is away to check the vaccum line leakage?
> Any kind of sparay or liquid?
>
> Thanks

Properway is to introduce smoke into the system, car not running, & see
if it produces anywhere it shouldn't.

Another approach is to take a propane torch, NOT LIT, and pass the
nozzle around various hoses and such. A running engine should increase
RPM if the hose is pulling in propane vapors.

AJ

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Chris H - 21 Jan 2007 18:28 GMT

You can also use starting fluid. Better yet, on a car that old, why not
replace all the vacuum hoses with new? It will take a few hours but will be
well worth the trouble. Get a pair of big needle nose pliers, some needle
nose visegrips and a few screw drivers to pry the hoses off of their nipples
without breaking anything. I think they even make a hose puller tool. Use
some silicone lubricant on the nipples before installing the new hoses as it
will make installation very easy.

Chris
90 GXE, 06 SE

>> Does any one know if there is away to check the vaccum line leakage?
>> Any kind of sparay or liquid?
[quoted text clipped - 9 lines]
>
> AJ

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AJ Foyt - 21 Jan 2007 20:54 GMT

If you like REAL excitement use the starter fluid. Propane is
relatively harmless around spark whereas with starting fluid things go
real bad really really fast. The most insignificant source of ignition
will light up the can and your new nickname will be "Lefty" if not
"Blacky" or "Rest In Peacey". SF is so volatile it ignites under
compression - used to boost start diesel trucks on cold days. Stay away
from SF. Run the propane around the intake manifold, intakes, MAF, etc.
to look for leaks at places other than hose connections.

AJF

> You can also use starting fluid. Better yet, on a car that old, why not
> replace all the vacuum hoses with new? It will take a few hours but will be
[quoted text clipped - 20 lines]
> >
> > AJ

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Chris H - 21 Jan 2007 23:20 GMT

Good point, AJ. I did use SF once to find a vacuum leak and it caused the
engine knock pretty badly for a moment which told me I had a leak, but I
could tell the engine did NOT like it!!! A mechanic told be about using it,
but he didn't advise me of said dangers, so I disavow any guilt associated
with this technique!

Chris

> If you like REAL excitement use the starter fluid. Propane is
> relatively harmless around spark whereas with starting fluid things go
[quoted text clipped - 34 lines]
>> >
>> > AJ

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