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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...
Steve Johnson, Wrenching GM Cars/Trucks For 40 Years
need more info than that, where does the smell come from and under what conditions does it smell e.g comes from trunk when I first start car etc. the easy answer is you keep leaving eggs in your car to rot. need specifics
it is happen to old engine because the oil that escape from the engine(engine cover near the exhaust) when it is got hot it sends bad smell but after how many minutes if it already dried up because of heat it will gone (like frying using the used cooking oil in pan there is a different smell).
The rotten egg smell if it is coming from the exhaust is a very good sign that you catalytic converter has failed or is failing. but a bad or battery that is being overcharged can also make a rotten egg like smell.
For the car reving itself, it could be the throttle positon sensor (i dont know much about it). I've experianced this myself but it comes and goes. Usually allowing the car to reach normal temp before driving properly helps this.
As for the egg smell. It will most likely be something to do with your fuel/petrol. Your engine wont burning sulfur properly and then turning it into hydrogen sulfide which is supposed to smell like eggs.
A good service should fix this, oil change, air filter, oil filter etc.
The most common causes of the smell are faulty catalytic converter, an engine running too hot or a faulty fuel pressure regulator. Another minor reason could be if your using a new place to buy fuel as different companies use different additives in their fuel.
The "rotten-egg" smell is caused indirectly by the catalytic converter.
The main cause is a rich mixture condition from the engine. Your SUV is equipped
with a computer controlled engine management system. You can scan your computer
for fault or error codes. The information should pinpoint the malfunctioning components. There is an alternate reason for the rotten egg smell. this also can be caused by a over charged battery. if so, make sure the alternator isn't overcharging the battery cell. it will boil the contents causing the egg smell. I recommend a diagnostic run to make sure what this problem is.
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