an experienced mechanic heard my engine and said i had an exhaust leak at the exhaust manifold. i hear it, too, and have heard it for a while. I intend to pay the mechanic a consultation fee, but i can't afford to have his shop do the maintenance nor pay for a brand new part. problem is, i'll need to do the job fast, so I want to make sure I have all the parts i need ahead of time.
is there a way to confirm that the leak is only at the manifold without taking off heat shields or tearing things down?
does anyone know how to find out the number of hours toyota allocates to this job?
could a leak here be affecting my EGR system and causing it to blow codes?
If you have an iron exhaust manifold, you can resurface the mating surface to make it flush again.
OR, you can add a second gasket to seal the leak, if this leak is where the manifold mates to the head.
those are good ideas, but i'm thinking i'll pickup a used manifold at $15 a pop and clean it up before i take my car apart. what i don't want to have happen is that i get the thing apart and discover i also need another expensive part and have to wait to get my hands on it.
Understood, BUT, if you get a used manifold, you need to check the mating surface for warpage, or you will end up with the same problem.
Not sure if the 5sfe uses an iron manifold or steel one. In either case, warpage can occur because the head is aluminum alloy and both those type manifolds are of a denser metal, having different heating/cooling/expansion rates.
to resurface...tape some 80 grit to a pane of glass and rub the mating surface on it?
I would just take it to a machine shop. I had the turbo manifold for my MR2 resurfaced. It was $20.00.
Once you have it off, get a flat edge, like a ruler, and lay the edge against the manifold surface in X fashion from end to end. If it's warped, you'll see space between the ruler and the manifold.
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could higher combustion temps from a bad VSV cause this warpage?
95 should still be iron, the only ones that are truely different are the ~98+ 5sfe camry exhaust manifolds and those should be steel and have 4 individual runners.
Manifold gasket replacement, depending on how bad the studs are could be anywhere from a 30min job to maybe two hours or so if a stud snaps. But, I have no idea how much time is actually listed to do this.
I wouldn't suspect the emission system causing this, as these cast iron manifolds (not only on the 5SFE) are notorious for cracking already. More than likely, in my opinion, its either just a bad gasket, or the cast iron manifold has just seen too many heat cycles in its life and it has failed.
so you guys both believe that i can safely assume it is only the exhaust manifold, and not worry about confirming it or having any other parts on hand besides a machined manifold & gasket before i proceed?
No, I'm going on what you have posted and what you said "an experienced tech" told you.
The only way I would confirm it, is if I heard it myself.
Small leaks at the manifold have a "ticking" sound.
In the end, you will have to make the final decision yourself with the information you have gathered.
so the next component down is the cat i suppose. that is substantially less likely to leak?
Quote:
Originally Posted by bumperbozo
an experienced mechanic heard my engine and said i had an exhaust leak at the exhaust manifold. i hear it, too, and have heard it for a while.
An exhaust leak can occur anywhere along the system, from manifold to muffler exit.
Do you not trust this mechanic?
This whole thread was based your statement on what an "experienced mechanic" told you.
Now you're talikng about catalytic converters. We gave you options to remedy the manifold, but you're the one there and going to have to determine where the leak is.
i trust the mechanic, but he had to go by what he heard because it was the end of the day and i was just swinging by really quick, so there wasn't time to get a closer look and take off the heat shield.
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