Question about 2004 GMC Envoy SLT

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Why do i have a rotten egg smell inside and outside the 2004 gmc envoy ?

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Posted on Jan 02, 2017

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SOURCE: battery removal on a 2004 GMC Envoy

The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one. 

Posted on Jan 28, 2009

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SOURCE: 2004 gmc envoy code 0128

This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

Posted on Sep 09, 2010

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SOURCE: when at idle shaking and

the rotten egg smell indicates the truck is running very rich which will cause it to shake at idle.you need to have it put on a scan tool to see what the readings which will help to diagnose faster.you could have too much fuel supply because of an injector problem a plug not firing,plug wire,problem with the pcm,too much fuel pressure in the system a sensor sending the wrong information to the pcm.

Posted on May 05, 2011

  • 12650 Answers

SOURCE: My 2004 GMC Envoy all of a sudden started running very rough. Also has a bad smell like rotten eggs(catalytic converter smell but very strong) Very bad performance. Problem?

sounds like cat converter just about completely clogged and the back pressure from it is choking the vehicle causing the cylinder failure --the exhaust cant escape and will kill [stall] the engine--- with it running feel the exhaust coming out if there is barely any flow from tailpipe cat conv has failed [clogged ] and will need replacement -----when check engine light flashes it is to advise that u have a malfunction that needs immediate attention or further damage may occur and or vehicle shut down may occure

Posted on Apr 18, 2013

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Rotten egg smell from exhaust it's not the coverter


its your carb had a 75 ply fury done same thing ,had to change carb

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My 2004 GMC Envoy all of a sudden started running very rough. Also has a bad smell like rotten eggs(catalytic converter smell but very strong) Very bad performance. Problem?


sounds like cat converter just about completely clogged and the back pressure from it is choking the vehicle causing the cylinder failure --the exhaust cant escape and will kill [stall] the engine--- with it running feel the exhaust coming out if there is barely any flow from tailpipe cat conv has failed [clogged ] and will need replacement -----when check engine light flashes it is to advise that u have a malfunction that needs immediate attention or further damage may occur and or vehicle shut down may occure

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Po304


If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

for your car you can use the us703,

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Sep 12, 2011 | 2004 GMC Envoy

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My 2002 Pontiac GP V6 smells like rotten eggs from the exhaust


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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When at idle shaking and smells like rotten eggs


the rotten egg smell indicates the truck is running very rich which will cause it to shake at idle.you need to have it put on a scan tool to see what the readings which will help to diagnose faster.you could have too much fuel supply because of an injector problem a plug not firing,plug wire,problem with the pcm,too much fuel pressure in the system a sensor sending the wrong information to the pcm.

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After removing all of my coil packs to change my valve cover gasket on my 2002 envoy the bolt on # 1 coil pack broke off level with hole in the head. as a temporary fix i used a piece of flat steel between...


yes you need to buy a tap and die kit and drill out the bolt so can put new one in probably the rubber on the clamp is melting or the the pack itself is from the clamp

Sep 24, 2010 | 2002 GMC Envoy

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