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Smells like rotten eggs but car runs fine

I have a 2002 dodge neon that just started to smell like rotten eggs or something died in it but the car still runs fine what could it be can anyone help

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  • Dodge Master
  • 3,187 Answers

Does your car have AC.... ? ac problems can make a eggy smell also a damaged catalytic converter do the same. eggy smell can be the gas from the ac leaking out. you would need to have this check as it can do harm to your lungs..

Posted on Mar 19, 2014

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Posted on Jan 02, 2017

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Mike258
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SOURCE: engine light on; slow acceleration; rotten egg smell 2000 vw passat 132,XXX miles

Hey there riddick,

That rotten egg smell is a problem with your catalytic converter. Too much back pressure is not allowing your engine to run normally.

I'll bet its been getting hot too.

Warning: For your own safety, until this is resolved, do not look under or stick your head under the car with the engine running. I've been in a vehicle when a converter with these same symptoms blew apart at the seam. Made my head hit the roof. If it happened a few minutes earlier I would've gotten a faceful of freshly flattened converter. So be careful.

To tell for sure about the problem, try to get it to an auto parts store that does free code readings from your On Board Diagnostics. There should be errors referencing the engine, O2 sensors and emissions. The exact diagnostic codes with determine your next course of action.

Be safe,
Mike

Posted on Sep 08, 2008

gordanddar
  • 477 Answers

SOURCE: Car died rotton egg smell

Not sure if engine coolant smells like rotten egs when it burns inside the cylinders , but it sounds like you may have blown a head gasket. Coolant and/or oil could be getting inside combustion chamber. Another possibility is that the catyletic converter might have broken up and colapsed onto the screen where it goes into the exhaust. Might give the rotten egg smell and block the exhaust enough to cause backpressure sufficient to cause the engine to run poorly too.
Try putting your palm over the exhaust pipe , if the exhaust is coming out in pulses (pop ,pop,pop) thats normal , if it is just slowly flowing out with no noticable pulses , I would check into the cat converter problem.

Posted on May 07, 2009

  • 362 Answers

SOURCE: 1996 chevy c1500 w/rotten egg smell,loss of power,rough idle

Your catalytic converter is plugged up,  If you check the exhaust output at the tailpipe you will find it restricted.
Let me know if I  can assist further.
Lone99star

Posted on May 08, 2009

  • 107 Answers

SOURCE: 2004 Trailblazer strong smell of exhaust/rotten eggs in interior

sounds like you have a plugged convertor

Posted on Jul 11, 2009

  • 56 Answers

SOURCE: 2003 Ford Taurus cylinder misfire #1 and #5 code

sounds like your wires are switched around. have replaced the plugs lately

Posted on Oct 08, 2010

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1 Answer

My car has a rich gas smell then when it warms up smells like rotten eggs does it have something to do with the cadillac converter?


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.

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run fault codes as the lack of rotten eggs smell is an indication that the cat converter is not functioning.

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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!

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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.

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1 Answer

Car died rotton egg smell


Not sure if engine coolant smells like rotten egs when it burns inside the cylinders , but it sounds like you may have blown a head gasket. Coolant and/or oil could be getting inside combustion chamber. Another possibility is that the catyletic converter might have broken up and colapsed onto the screen where it goes into the exhaust. Might give the rotten egg smell and block the exhaust enough to cause backpressure sufficient to cause the engine to run poorly too.
Try putting your palm over the exhaust pipe , if the exhaust is coming out in pulses (pop ,pop,pop) thats normal , if it is just slowly flowing out with no noticable pulses , I would check into the cat converter problem.

May 07, 2009 | 1997 Buick Riviera

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Engine light


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.


please rate and god bless.

Mar 17, 2009 | 1999 Dodge Durango

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