Question about 2004 Mazda RX-8

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Catalytic converter over heats, white smoke coming from engine and exhaust rx8

Low compression

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: moved my rx8 yesterday.i got ack in it this

Take out the fuel pump fuse. Crank it over till it starts without it. Put the fuse back in and crank on it again. I had to put a battery charger on my car. It works great, but a little hard on the starter.

Posted on Jun 26, 2009

  • 117 Answers

SOURCE: theres was smoke coming from the exhaust and engine

if you have white smoke in your exhaust, you have a blown headgasket, and if you 626 is turbo'd and depending to the tubo is cooled eg antireeze, then coolant could be leaking out that way too. also it would be helpfull to know what the steam is coming from. BUT since you mentioned that is coming from the exhaust, it woud wager that its a blown head gasket. you can veryfi this a number of way. take out your spark plugs one at a time and have a look at them. if a couple look "too clean" or seam to "steam cleaned" compared to the other ones = lack carbon build up etc, then the plug that you took out is the cylinder where the engine coolant is leaking into. also, you can do a compression test = which ever cyclinders are super low = blown gasket is located on that cylinder. PS if you do have a blown head gasket, you should replace your oxygen sensor as well because the glycol in the antifreeze wrecks the O2 sensor.

Posted on Jul 08, 2009

  • 299 Answers

SOURCE: 1984 Mazda Rx6 (FI) - Gray smoke from exhaust

IF it has injectors that would be the problem but check to make sure if is not carburated if it is probably bad float

Posted on Sep 23, 2009

SOURCE: I am getting a code p0420 on my madza rx8 2005 the

The converter should last 10 or 15 years if you don't have issues that damage it. Get thoses codes checked out and repaired. If you have antifreeze entering the exhaust,a leaking fuel injector,bad o2 sensor etc,that could ruin the converter,if you drive it that way for a year or more. The converter may be installed wrong or an exhaust joint is leaking in air and setting a code. o2 sensor loose and other issues. Have to start somewhere and walk it down untill you find the problem.

Posted on Mar 11, 2010

  • 257 Answers

SOURCE: How much does it cost to fix a catalytic converter

To do it yourself: around $90. At a shop: $120 to $150 depending on the shop. Hope this helps! Please rate 4 thumbs up!

Posted on Apr 19, 2011

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2 Answers

What would be causing what sulfur smelling exhaust smoke?

The Smell is-- Sulfur Dioxide-- from an over heated
Exhaust Converter

Yes-- it will be ruined soon

White Smoke all the time, could be a head gasket

It could also be-- lots of fuel-- that is overheating the converter

Have to look at fuel trim on scan tool data

Aug 23, 2014 | 2012 Ford Fusion S Sedan 2.5L 4-cyl....

2 Answers

No visable fluid leaks but, lots of smoke coming from tailpipe on cold start. The smoke stops when the engine is warm. Car runs smooth and no problems at all other than the smoke coming out of the...

If this condition happens first thing when you start the car, especially in cold temperature(s) climate, you have nothing to worry about; this is normal. It is simply water vapor- a normal combustion byproduct.

Here's what happens: the exhaust manifold is attached to the engine.

The exhaust manifold takes the exhaust from each cylinder and combines it into the manifold.

The exhaust gases then pass through the exhaust pipes to the various components of the after-treatment system which include the exhaust gas recirculation (EGR) system, catalytic converter and the muffler.

Before the gasses reach the catalytic converter however, they pass the oxygen sensor. The oxygen sensor tells the on-board computer what the composition of the gas is, and diverts some of this gas back into the engine via the exhaust recirculation system.

The recirculated exhaust helps keep some of the toxic gasses from entering the rest of the exhaust system.

The recirculated exhaust gasses also cool the engine cylinders, which in turn, decreases fuel consumption.

Depending on the year, make and model of the vehicle, the exhaust gas recirculation system may have an electronic EGR valve or a vacuum-operated valve. The electronic EGR valve has additional parts, including an EGR solenoid.

If the EGR system does fail, you may hear a ping and the vehicle won't pass emissions. If the EGR valve fails in the open position, the vehicle will not idle properly.

When the exhaust gases reach the catalytic converter, it reignites the gases that are not burnt in the combustion chamber so that they are not emitted into the atmosphere.

The catalytic converter creates a chemical reaction, burning the excess gasses and toxic by-products from the engine combustion process.

And in so doing, the catalytic converter changes carbon monoxide and hydrocarbons into water vapor and carbon dioxide (which is its main function.) And that is what you are seeing coming out of your car's tail-pipe!

Warmest regards.

Mar 11, 2014 | Mazda MX-5 Miata Cars & Trucks

1 Answer

Cylinder #1 with low compression

White smoke out of the exhaust means a coolant leak in the engine. When you accellerate hard and get that it could be the head gasket is leaking. The bad thing is that coolant leaks can ruin the catalytic converter too. You are looking at several thousand in repair bills.

Mar 01, 2014 | Hyundai Cars & Trucks

1 Answer

New Toyota Etios, VD,KM 1100, observed thick white smoke from exaust pipe for @ 1 Min, while running engine on ideal.

the white smoke occurrence is due to unique Vehicle usageconditions like slow speed & Short trips drivingthe catalytic convertor is not able reach its optimum reactiontemperature. As a result, the Hydrocarbon accumulates in the Catalytic Converter.After sometime, once the saturation limit is attained, the accumulated Hydrocarbon
starts burning inside the Catalytic Converter. During this Chemical Reaction,Momentarily the white smoke is seen in the exhaust and is normal

Jan 20, 2013 | Cars & Trucks

2 Answers

Hi there, please can you help? I have a 2005 231bhp Rx8 thats not running properly. It is displaying fault code PO410, and the car will not rev, little better when cold but really struggles to get over...


May 05, 2011 | 2004 Mazda RX-8

2 Answers


White smoke is caused by engine coolant / antifreeze being processed in the combustion chamber(s) of the engine

Keep in mind that, on a cold day you may see what appears to be white smoke from the exhaust that will disappear after the vehicles engine has warmed up to it's normal operating temp.. This is a normal reaction called condensation... condensation is the result of a small amount of water/dew being drawn into the exhaust usually collecting in the muffler and/or the catalytic converter.

Hope helps.

Mar 20, 2011 | 2002 Nissan Sentra

2 Answers

Suzuki Vitara V6, MAF sensor, white smoke.

My first thoughts are that you have a head gasket or intake manifold gasket failure. This is why you have the white smoke. If you run it too long, your catalytic converter will be destroyed. Check for coolant in your oil too.

Dec 01, 2009 | 1999 Suzuki Vitara

1 Answer

White smoke from exhaust and smell gas fumes

A plugged catalytic converter can set codes, but I think we need to concentrate on smoke right now. That's not saying that the converter wasn't a partial, or the cause of the white smoke. Has your oil level or coolant level been going down, or up recently, since this all started ?
You say he cleaned all the insides of the catalytic converter out, so there is no blockage there now, correct? Did you erase the code when you replaced the oxygen sensor, and it came back again? Finally, if you have white smoke rolling out your exhaust, it is usually caused by oil or coolant consumption getting into the cylinder, which could also be causing oxygen sensor to foul up & cause a code. I'd concentrate on finding the cause of the white smoke first. Cooling system pressure test, engine compression check should tell you , but so should consumption of oil or coolant increase. If the problem originated at the converter (plugged) it may have caused a blown head gasket for one thing. I'll wait for your reply.

May 09, 2009 | 1991 Honda Prelude

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