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Maybe.
The rich gas smell is probably due to injector problems. The rotten egg smell is sulphur in the fuel, which reacts to the catalytic converter. The rich smell would need to be fixed first by checking the injectors and the engine computer.
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).
If car runs okay with egg smell, its normal and working the way it should, if car is running poorly and the rotten egg smell has gotten worse, its a sign that your exhaust catalytic converter will need to be replaced. good luck!
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.
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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