Engine - Exhaust Leak

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Date: Thu, 5 Mar 1998 10:05:22 -0500
From: redline1@juno.com (Kurt m Steiger)
Subject: Exhaust noise
To: Toy4x4@tlca.org

Hey guys (& GALS)  I have a problem w/ my exhaust!  When the motor is
cold my exhaust sounds like there isn't a manifold on the engine at all. 
I had a pin hole in my other system right where the collector is, this
truck i can't find a hole anywhere.  Anyone got an idea what my problem
is.  I am considering a complete new system if i have a bad manifold
gasket or pipe.  I need to keep the convertor and also want to keep the
cost low.  Would love some feed back on what to use ( how much can i do
myself ie. no welding) no problem doing the bolt on thing.  AND the
bright side to all this is i get a new exhaust and my wife is none the
wiser on the costs involved.

thanx in advance!

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Date: Fri, 6 Mar 1998 13:35:00 -0800
From: "Smith, Patrick S." 
Subject: Exhaust noise
To: "'Toy4x4@tlca.org'" 

One way to hunt down exhaust leaks is to partially block the tail pipe (not
enough to stall it) and then put A FEW DROPS of auto tranny fluid (ATF) in
through the carb.  Unlike oil, ATF produces a whiter smoke and makes it
easier to spot leaks.  Works best if you have another set of eyes watching
the exhaust from underneath.
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Date: Fri, 29 Jan 1999 07:24:23 -0800
From: Jim Brink 
Subject: Re: tacoma v6 edlebrock headers

Jeff Deifik wrote:
 
> I have the edlebrock headers.
> When driving with moderate or heavy throttle, I hear a noise
> that sounds like an exhaust leak. I don't think it is a vavletrain
> noise, as it doesn't appear at low throttle, with the same RPM.

Are you sure it isn't just added noise from the headers themselves?
Since headers are usually made of much thinner tubing than the stock
manifolds, the noise from the exhaust pulses tend to emulate an exhaust
leak or ticking noise.
 
> I have tightened down every
> bolt in the headers up to the cat. I have covered the funny
> hole in the header (probably for some EGR device for a different
> application) with a steel plate, and used plenty of high temp
> silicone (as the edlebrock techs suggested).
 
> The only thing I can think of, is the header gaskets (the ones that
> attach to the heads) may have a small leak.

Headers are supposed to leak. That is the beauty of having them! :-)
Okay, just kidding. I learned a neat trick from an older mechanic that I
work with (ya' know, a "real" mechanic). He taught me to take some 3/8"
fuel hose and use it as a stethescope. Place one end in your ear,
keeping in mind the "Never place anything smaller than your elbow in
your ear" safety tip, and the other along the header to head flange,
y-pipe flanges, and pipe to catalyst flanges. An exhaust leak will sound
just like hissing through the vacuum hose. Works great!

Hope this helps.

Jim
- -- 

Jim Brink

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