Question about 1990 Nissan 300ZX

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Catalytic converter smoking

Smoke is coming from the catalytic converter and the back of the engine. it sounds like that its misfiring but I am not sure. Any help would be greatly appreciated

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Chech the ignition timing first.usually nissan vehicles has an ignition timing of 10 degrees before top dead center.after that clean or replace the spark plugs.use only unleaded gasoline.

Posted on Aug 12, 2008

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Posted on Jan 02, 2017

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My Durango has a smell and gray smoke comes out the tail pipe when I start it


Check for computer error codes with an OBDII scan tool - it'll probably tell you that the catalytic converter is failing, but it won't also tell you that your engine is probably badly worn so you're seeing oil smoke - when the catalytic gets hot enough, it fully burns off the oil smoke so you won't see it any more. Meanwhile, your oil level is probably dropping pretty fast.

Aug 10, 2014 | 2001 Dodge Durango

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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

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

1 Answer

If the Catalytic converter is gone in a Honda Crv 2003 model does the vehicle blow smoke from exhaust and have a louder sound from exhaust when over 3000 revs?


Its possible the catalytic converter is stopped up, or the muffler.
A mechanic would disconnect the cat and check for blockage.

Jul 14, 2012 | 2003 Honda CR-V

1 Answer

1994 mazda mx3 starts and then quits


Blue smoke from the exhaust = burning engine oil.

Apr 23, 2012 | 1994 Mazda MX-3

1 Answer

I was coming back from a road trip to the mountains and notice my check engine light started flashing. Not to long after that my car would run rough while idling after getting gas. After, getting home from...


u have a serious engine problem....when the check engine light it flashing that means the engine has a misfire in the igintion system....u need to bring this to a service garage asap or major engine damage will occur.... but if u have smoke from the exhaust damage may have all ready happened...also that misfire can also melt down the catalytic converter in the exhaust system......

Jul 18, 2011 | Chevrolet Blazer Cars & Trucks

1 Answer

I have a 2003 Ford Escape with a PO420 error code. When I accelerate, it sounds like air is coming from my engine. What is the problem and what should I do?


Here's what the code means, P0420 -- Catalyst System Efficiency Below Threshold (Bank 1).
Causes: Bad O2 senor, bad catalytic converter, and/or leaking exhaust manifold.


The error is coming from the O2 sensor number 1 between the exhaust manifold and the catalytic converter. The sensor itself may not be the problem. From what your describing is maybe a leak coming somewhere near the exhaust manifold. This would set off the P0420 code. Look around the exhaust manifold down to the catalytic converter for leaks that will leave black marks from burned fuel. If this can't be easily found, you may have to take the car in and have the exhaust hooked up to a smoke machine. This will inject smoke into the tail pipe and any leaks will be found by the smoke coming out of it.

Nov 16, 2009 | 2003 Ford Escape

1 Answer

Check engine light is flashing, the car idle's up and down,and it smoke's! the smoke smells like fuel like its running really rich


if your check engine light is flashing it means there is damage being done to your catalytic converter which is BAD. if your car is misfiring that bad i suggest you check spark to all your cylinders and make sure your timing is correct

Nov 02, 2008 | 1992 Mazda Protege

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