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Exaust flow


Bob_Caddy

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Hi everyone! I bought My caddy 2 months ago. When I bought it the muffler flow was a little off, because the right one flowed a little better then the left! Now there is about 5 times the exaust comming out of the right! Please help! They both sound fine except the left shakes a little more! I took it to a muffler shop and they said both the mufflers were fine! And my milage hasn't droped any yet! Any Ideas!

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Now there is about 5 times the exaust comming out of the right! Please help! They both sound fine except the left shakes a little more! I took it to a muffler shop and they said both the mufflers were fine! And my milage hasn't droped any yet! Any Ideas!

I'm wondering too, how do you know this is unbalanced? By feeling the pressure with your hand, or watching the vapor when you first start it up? It obviously would be a difficult thing to accurately measure... :unsure:

The first thing that came to mind, especially when you said the left one shook more, was that something internally may have rusted and came loose inside it. This may block the flow, but you usually hear that. I know I did on the muffler I had that happen to once. :angry:

I'm also surprised that the muffler shop didn't recommend imediately replacing them both! Most of those guys are so hungry that they wouldn't let a customer get away that easy! :P

One thing I noticed with cars like our that have a one splitting to two pipe system is that the flow isn't really strong. Even with my 2 1/4' dynomax's the exhaust just kind of hovers out of the pipes at idle. A system like that would the muffler imbalance would be much more noticeable. Not like my Firebird, when I fire that thing up. B) That has a true dual exhaust with no converters of course.

'09 Cadillac CTS-4 3.6 direct injection, 128 K mi.
'15 Chevy Tahoe LTZ, 5.3i V8, 125 K mi
'70 Firebird Formula 400, Bored+.04, RAIII heads, M21 4spd., in-process restoration!

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The guy at the muffler shop just lightly inspected it and said everything looks fine! I can notice almost all the vapour comming from the right muffler! The muffler has a very tiny hole, but that would not be enough to cause the inconsistant flow!

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Since each side it independent this is odd. When I look at my car warming up the exhaust looks even, how are you determining this from sound or viewing it? If its vapor, maybe you are getting more condensation in one muffler than you are in the other, maybe the weep hole in the one that is giving your more vapor is blocked and you 'see' more flow but you are really seeing more vapor as the moisture is burning off, I would not worry about it. Are the mufflers the same of does it appear that one is newer?

Often, if I follow other cars, one exhaust will have vapor while the other does not...

Which muffler has the hole, the one with or without 'more' vapor? I would take her out for a long hard ride, burn off all of the moisture, then see what you see....

The WORST case is that you could be seeping coolant at the head gasket on that side! :unsure: Try a dose of cooling supplement tablets if you can not figure out the vapor in the one side....you have a 94, and that was before the dexcool, you might want to drain your radiator and put in fresh coolant and a full dose of cooling system supplement

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The guy at the muffler shop just lightly inspected it and said everything looks fine! I can notice almost all the vapour comming from the right muffler! The muffler has a very tiny hole, but that would not be enough to cause the inconsistant flow!

Two things just dawned on me when I was going over this post again...

1) We are assuming that the left one must have some kind of blockage. Actaully, maybe what is happening is the right one has blown out part of the chambering, or that one of them has been replaced with a similar muffler but flows differently...

2) That small hole in the one... If it were me, I would get a tool and pry that open enough to justify putting on a couple of new Dynomax Super Turbos to wake up that mighty Northstar!! :D

'09 Cadillac CTS-4 3.6 direct injection, 128 K mi.
'15 Chevy Tahoe LTZ, 5.3i V8, 125 K mi
'70 Firebird Formula 400, Bored+.04, RAIII heads, M21 4spd., in-process restoration!

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Thanks scotty! It appears that the right on is a little newer. I will take it for a good run tomorrow and see what happens. What are cooling supplement tablets?

You can purchase the cooling supplement tablets at your local Caddy dealer.

Here is a post from the archives regarding the cooling supplement by our local expert bbobynski, I hope this helps;

With all the discussion about the coolant supplement and pellets

let's clear up somethings...

The coolant supplement is another name for cooling system

sealer. It will prevent coolant system leaks. Period. It has

nothing to do with protecting the head gaskets, affecting the pH

of the system, corrosion inhibitors or anything else. It is

just a sealer.

Head gaskets fail because the corrosion inhibitors in the

conventional green coolant become depleted over time/miles. The

lack of corrosion inhibitors in the coolant causes the steel

substraight of the head gaskets to start to corrode/rot and

eventually the head gasket will fail. The coolant supplement

pellets will not prevent this. Nor will the coolant supplement

seal up head gasket leaks. The high pressure combustion gases

are way too much for the sealer....

It is imperative to use the coolant supplement in the

4.1/4.5/4.9 liter engine. It is a good idea to use it in the

Northstar engine but not as important as the 4.x engines.

The 4.x engines have several places in the cooling system where

coolant passages and the internal engine oil cavity are adjacent

and any coolant seepage or leak at this point can introduce

coolant into the oil which will cause the engine to eventually

fail. The coolant contaminated oil will break down and not

protect the engine against wear. Things like cam lobes and the

distributor gear will wear out and fail. The prime areas in the

4.x engines where coolant and the oil cavity are adjacent is

along the deck surface of the block on the inboard edge of the

cylinder heads, the water crossover passage in the intake

manifold where it connects to the cylinder head and the water

pump/front cover interface in one small area. At any of these

coolant seepage can occur over time as gaskets age, etc. so use

of the coolant supplement is mandatory to insure long life of

each and every engine.

The Northstar is designed such that there is very little likely

hood of coolant intrusion into the engine oil. All the coolant

passages are divorced from the oil cavity and the valley of the

engine is "dry" on the Northstar so that a coolant leak in this

area is to the outside world...i.e...onto the ground, not into

the oil. All the connections for the water pump and water

crossover casting are arranged such that a leak will be to the

outside world, not into the inside of the engine. Coolant sealer

on the Northstar will guard against any external leaks or

seepages from gasket surface imperfections, aging gaskets, etc.

I consider it important to maintain the integrity of the cooling

system over time but it is not nearly as critical as use on the

4.x engines.

The coolant supplement is basically small organic fibers which

are held in suspension in the coolant. The stuff is ground up

ginger root and walnut shells....!!!! The small fibers collect

in a leak and swell on the side exposed to air and plug the

leak. The fibers get chopped up by repeated passes through the

water pump impeller and over a long time become less and less

efective as what is left of the fibers is too "short" the span

any sort of leak. This is the source of the eventual layer of

sediment reported in many cases...the supplement turns to "dust"

and falls out of suspension. Replenishment of "active' or

functional sealer is necessary occasionally (30K-50K miles) to

keep the system fortified. When the cooling system is drained a

lot of the supplement is lost so it needs to be replaced.

The coolant supplement can be used with both the conventional

coolant and DexCool. There is nothing in DexCool that

eliminates the need for the supplement nor replaces it. The

supplement is completely compatible with both the green coolant

and DexCool.

Hopefully this helps ease some minds and correct some

misconceptions.

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Purchase the supplement and crush and place 4 tablets in the upper radiator hose, do not put the tablets in the tank.... There were rumors that GM stopped selling this, if they did you may be able to find it in your auto parts store, here is a direct substitute

http://www.autobarn.net/chhdc.html

If anyone else feels the 4 is not the dosage chime in here and set this fellow straight

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Great ! i hope that this forum could help you! It has helped me alot as well! I just dont understand why you have to type every sentence with an exclamation mark! It sounds like im yelling when im really not! It messes with my inner monologue! jk

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