oh that's an exhaust leak they were told
they don't have an exhaust leak somebody
checked it out they couldn't find one
i definitely hear something we're gonna
need to check this out
hey friends it's len here from one auto
if you've been keeping up with our
videos like i know you have
you know how to check for exhaust leaks
unfortunately though sometimes checking
for an exhaust leak
isn't going to be the tried and true
hold your hand against the exhaust and
look to see if you find an exhaust
leak sometimes they're going to be a
little less apparent and sometimes they
might even be a little hidden
essentially you just want to start up
the vehicle and then listen see where
that exhaust leak sounds like it's
coming from is it coming from the back
of the vehicle or the front of the
vehicle
it'll kind of give you a starting point
on where to start looking but
the best way to start looking would be
essentially if you can get underneath
the vehicle so if you maybe want to put
it up on jack stands
or on a lift if you're lucky enough to
have one you'd want to have the vehicle
started
then you want to come right over to the
tailpipe and try to cover it
when you cover it you want to try to
feel if you have any pressure if there's
no pressure trying to blow your hand off
of there
more than likely there's a leak
someplace to check for a leak of course
if you had a second person they can
continue trying to hold it
and you could feel along any of the
seams on your exhaust and then of course
just follow down along the tops and the
bottom of the pipes assuming that
they're not very hot
and just feel and see if you feel any
air coming through you can just give it
a little listen and see if you find
any noises coming from any of the joints
or seams keep making your way all the
way across to the front
and essentially where we're heading to
right now for us particularly
is the manifold on this vehicle
generally what happens if you have an
exhaust manifold leak of any sort you're
gonna especially be able to hear it
when the engine's cold or at least when
the exhaust is cold
the reason for that is because when
things are cold they tend to contract
especially metal
so if that happens if you have a
discrepancy in the metal such as a crack
or an imperfection of some sort
it's going to be very apparent and the
exhaust fumes slash noise is going to be
able to make its way
out through it once the vehicle warms up
or the exhaust warms up
the metal is going to expand and of
course it's going to kind of close up
that crack
so you might notice that your exhaust
leak tends to go away after you've
driven down the road maybe a couple
miles
real quick we should probably talk about
what an exhaust manifold is
the exhaust manifold is going to be the
part of your exhaust that's going to
mount directly to your engine
this is where the combustion from inside
your engine is going to come out of
and then lead its way down to the rest
of your exhaust such as your catalytic
converter and then of course down to the
muffler
and out the tailpipe now some manifolds
are going to be right out in the open
it's going to be very easy to see almost
everything some manifolds on the other
hand are going to have nice covers over
them that are going to help protect
everything from the heat that's going to
be emanating from it
what you actually need to do when you're
trying to diagnose an exhaust leak from
a manifold is of course to get these
shields off of here
because that's the only way you're going
to be able to get a good grasp on what's
going on behind them
all right so we've got the manifold out
so we can take a quick look at it
there's going to be a couple common
places that you'd want to look for a
leak on a manifold
one of the first places that i would
look especially if i have it out would
be right along this area right here it
should be very flat because of course
there should be a gasket that runs
across these
in between the manifold and the engine
itself if when looking at the manifold
you happen to see that there's a lot of
raised areas
and lower areas you can kind of make a
pretty good inclination
of where you might have a leak obviously
it needs to be as smooth as possible
sometimes what you might happen to see
is some black or even some white coming
along those lower areas that's going to
be pretty much where the exhaust leaks
coming from
some of the reasons why this might
actually occur might be because
possibly the hardware loosened up a
little bit and it created a gap
in between where the gasket's supposed
to hit up against the engine or even the
manifold
and then of course what you might get is
build up or even corrosion
of the sort if you have anything like
that and you notice that your hardware
is loose
you're probably going to have an issue
that looks a lot like this
another reason why you might find a leak
on your manifold could be something due
to a simple crack
a lot of times they're going to be hard
to see because more than likely you're
going to have some shields over your
manifold
and that's to kind of help dissipate the
heat before of course it gets close to
any of the other engine components
behind those shields what you oftentimes
find is a tiny little hairline crack
maybe along the tube
generally it's going to be along a curve
of some sort manifolds are of course
very curvy
sometimes you might find it in between
one of these areas where two parts come
together
or even maybe along one of the bends so
pretty much you'd want to check them all
out
and generally speaking if you do happen
to see something that looks like a crack
it probably is and also you might happen
to see a little bit of black
or even white along those cracks but
check out your whole manifold
make sure you don't have any leaks
coming along any of your tubes and of
course
turn it over and do the same on the
reverse side
a common reason why you might find that
you have a hairline crack on your
manifold whether it's in one of the
grooves or out like this
would generally be because you have to
imagine how much heat is actually coming
to these manifolds
there's a lot of heat that's created
inside your engine inside the combustion
chamber it's going to be getting forced
out directly to your manifold so this is
going to be pretty much one of the
hottest parts of your exhaust
so think about how hot this might get
and then of course it cools down when
you turn off your engine
you start it back up you run it it gets
hot you rev it up it gets hotter
and then it cools back down hot cold hot
cold back and forth
of course metal is expanding and
contracting as that's happening and you
might find that you have an issue
if you find that you have either a crack
on the manifold as i said
or even an issue with the gasket in
between the manifold and the engine
you might potentially hear a ticking
noise under acceleration
generally when the vehicle is cold once
it heats up more than likely the noise
will go away
so if you hear a loud ticking noise when
you first start up your vehicle and then
it goes away
you probably have an issue up near your
manifold one last thing i want to talk
about on the manifold is the donut
gasket
this is going to be the gasket that goes
between your manifold
and of course the down pipe generally
speaking it's going to have spring
tension on it because little spring
bolts that you have to remove
overall it's very common for this part
to leak especially if your springs are
loose
the exhaust is going to be able to force
its way out in between the two pipes
one of the things about these pipes that
you might happen to notice is they tend
to have a lot of shields around them and
just like the manifold
around the shields is generally where
you're going to find a leak
these shields unfortunately are welded
onto the pipe so they're going to be a
little bit harder to get off it's not
just something you can unbolt generally
so what i'm going to do is sense the
manifolds out and out of the way
i'm going to take a peek right inside
that pipe the best way to take a peek
inside the pipe and find out if you have
a crack of any sort is of course while
you're looking in
hold a flashlight on the outside if you
see any light shining in
into the dark area from the outside you
know that you definitely have a leak
and like i said generally speaking that
leak is going to be found right along
the weld
where the heat shields put onto the pipe
so take a quick peek
if you don't see any leak you're
probably doing all right this one needs
to be replaced
another place to look for a leak would
be right between the manifold and the
actual engine itself
a lot of times what happens is they'll
have a buildup of corrosion
or maybe even the gasket that's supposed
to be between the two
just kind of dissipates or goes away
over time
other things that might happen is if the
bolts or nuts that are holding the
manifold to the engine
tend to loosen up or break off that of
course is going to cause a leak as well
in either case if you have a leak you're
more than likely going to see some black
soot around the holes
so just take a quick peek see if you see
any areas around the ports that look
like they have a lot of black solder on
them
that would kind of give you an inkling
on where to start looking
generally speaking if there's a gasket
you of course want to take it off of
there
inspect it thoroughly clean down the
engine completely
and of course if you're going to be
reusing your manifold because it might
still be in good condition
you'd clean down that surface as well go
ahead and put it in with a new gasket
some new hardware and bolt it back up so
if we take a look at the gasket that
goes between the manifold and the engine
itself
when you look at it you want to look to
see if you see any dark areas
something that looks a little black
maybe like this or maybe even if you
were to look at the other side we see a
much larger area that's black
the reason why they might be discolored
like that is because like i said before
if there's a discrepancy in the middle
whether it's a raised area or a pitted
area
it's going to allow the exhaust to seep
through and it's going to make its way
in between
either the manifold and the engine or
the gasket and of course it's going to
make a study area where it's coming out
of
so if when you remove your manifold and
you see this on your gasket you know
that that's pretty much where your leak
was coming from
okay friends we tried to make you a nice
informational video about different
places you can look for exhaust leaks on
your vehicle
aside from the regular check your
muffler check your mid-pipe type
situation
a lot of times if your vehicle is cold
or at least your engine is cold
when you start up the vehicle you might
hear a ticking noise if you know you
hear a ticking noise when you first
start it up but it goes away after your
engine is warm
more than likely you have an issue up by
the manifold
there's a couple different issues you
might have with the manifold such as the
crack as i mentioned
or even an issue with the gasket in
between the manifold and the engine
itself
in which case once the metal expands and
it gets hot the exhaust noise is going
to generally go away
aside from that if you need any parts
you can always check us out at
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