[Adjuster]

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My 1993 GMC Sonoma gets very little use. Maybe started 6 times per year and driven 2 times per year. Today I started it and immediately noticed it sounded different. Or should I say it didn't sound like anything!!! It started right up but it is extremely quiet, almost to the point of not being able to hear it run at all. It normally has a little bit of exhaust rumble. I did hear what I believe to be some slight exhaust popping coming from near the engine. I went back to the tail pipe and again very quiet. I put my hand down and I do feel some hot exhaust coming out but almost no sound. I am suspecting a partially backed up/clogged exhaust. I did drive it and it seemed to drive ok but once again while driving I couldn't hear it running at all especially while coasting, very weird feeling. Are there any simple tests to diagnose or confirm a backed up exhaust?

By the way we do have mud daubers(sp) pretty bad around here. I wonder if some got in the exhaust?



Thanks

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[Geeorge]

Put some fresh gas in it and drive it some more and maybe a bottle of this

 

[MaxxAction]

If it’s sat for a long time, the exhaust may be full of rodents and nests.

I had an old truck that we used to haul stuff around the property. It sat over winter without use for about 5 months and when I started it it blew mice and straw and dog food all over in back of the truck. A whole mouse village.

 

[Atomic Punk]

If you had a total blockage, the engine wouldn't start.
I have seen small things jammed into the exhaust shoot out like a cannon.

If it it extra insect muffins. It will break up, and blow out eventually.

Did you try driving it around?

 

[pittpa]

Or bits of catalytic converter.

 

[Adjuster]

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Dang my thread got moved. I didn't even know we had a car forum!



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[Adjuster]

Or bits of catalytic converter.

Yeh this is what I am concerned about! I hope if it really is a backed up exhaust it is just critters! What I need is someway to positively determine a partially blocked exhaust?



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[Geeorge]

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Dang my thread got moved. I didn't even know we had a car forum!



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No one new will see it now that you got banished to the dungeon forum

 

[FullClip]

So much I could say....but I know it's a trap.

 

[Ramjet38]

I didn't know we had a car forum either.

 

[FlyFisher1]

So much I could say....but I know it's a trap.

 

[Moddey Dhoo]

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I didn't even know we had a car forum!



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Kahr Forum is probably General Firearms Forum.

 

[FullClip]

My exhaust was backed up real bad once. Butt after a cup of coffee and Camel it all got blasted out.

 

[mhambi]

Shouldn't this be in the Truck forum?

 

[PEC-Memphis]

My exhaust was backed up real bad once. Butt after a cup of coffee and Camel it all got blasted out.

Is the camel “backed-up” now?

 

[FullClip]

Is the camel “backed-up” now?

Nope.,.
Chili and big charges of green beans cleans everything out wicked good.


Like swallowing a Bore-Snake.

 

[FireForged]

I would suspect a converter that has rusted and collapsed on the inside OR something built a nest in there. That is assuming that all your cylinders are firing.

 

[NoStress]

Vacuum gauge.

Simple Car Exhaust Testing | Walker Exhaust Systems

 

[ReaPer105]

Get hearing aids.

 

[AutomotiveTech]

20+ years and never heard that complaint. Since an engine is basically an air pump, don’t discount the intake side. I’d find it easier to believe something built a nest in the air filter. A significant restriction should also cause a loss of power. Did the truck feel sluggish under hard acceleration?