Question about 2001 Chevrolet S-10

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2001 Chevy S-10 shuts down after warming up, I can smell sulfur or rotten eggs. Can the catalictic convertor or the oxygen sensor be causing this?

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  • Anonymous Mar 26, 2014

    shuts down misfiring and smell like today

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The converter can cause it yes

Posted on Feb 25, 2009

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#1. Driving on rough or gravel wash board road?
Could be convertor. Especially if you truck has lost power lately.
#2. EGR Valve. Computer is trying to adjust for an improperly operating EGR valve. Not one which has completely failed, the ECM would circumvent this in most cases and set a code, causing the Service Engine Soon light to come on.
#3. Oxygen sensor would set a code, SEL would come on, and the computer would bypass this, and you would see a drop in fuel mileage. But from time to time the computer will try to read the sensor and you might notice a difference while driving, but it would go back to a preset value, or default value, and continue running.
4. I suspect strongly that your EGR has malfunctioned. Check fuel pressure, but remove and clean your EGR valve with an approved cleaner. Reference your auto parts store for that info. Make sure everything moves freely, and check your catilytic converter by seeing how much exhaust pressure is at the tail pipe. If it is weak, have someone rev the engine slightly, if you hear a "JET" or other sound like it seems to be under a lot of pressure, or if the donut gaskets at the exhaust manifolds are leaking/ blown out, then there you go, to the muffler shop.

Posted on Feb 25, 2009

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1 Answer

I have a 99 chevy lumina 3.1 engine it starts up great but it smell of fumes from exhaust pipes after a while it cuts off


The problem you describe is almost certainly a bad/stopped-up catalytic converter. Not fuel line, not trunk seals, not head gasket or anything else. The fuel line answer is just wrong. If your catalytic converter is bad or stopped up, you will also almost certainly need to replace the Oxygen sensor as well.

You didn't say it smells like rotten eggs or sulfur, but that is the most commonly-stated description...it isn't accurate; a bad converter smells like a bad converter. Most people find the odor similar to rotten eggs or sulfur. A clogged exhaust system will shut an engine off after a short time due to backpressure and excessive temperature buildup.

Your check engine light should also be on. Read any diagnostic codes the PCM has set. I'm fairly sure your problem is the catalytic converter...

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The smell is coming from the catalytic convertor. You have emissions problems. Try and have the codes brought up on the vehicle, that will narrow down the possibilities. Your Oxygen sensor could also be at fault. There is a product that will take the smell away, but it only masks the real problem.

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Some good news is the sulfur means the cat is functioning.

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The o2 sensor itself may be bad... causing the ECM to get bad readings and send extra fuel that isnt burned during ignition.

Check the engine codes with an OBD reader, (even if the CEL is not lit) because the bulb may be out or missing.

If you get codes, ask the parts store or re-post here, and I can help you further.

Thanks for using FixYa - A FixYa rating is appreciated for this freebie question.

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