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My engine is not burning all the air fuel mixture, and the exhaust is very hot going into the cats and muffler?

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If it can't exhaust because of a plugged converter then you will get all the above symtoms,replace it.

Posted on Nov 12, 2009


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Precat on nissan altima is giving me a code p0420 and want to add a header

code p 0420 refers to cat converter system bank 1---efficiency below threshold ( cat converter cracked internally and not lighting up)=== causes ---cat converter---wiring -- heated oxygen sensor (HO2S ) 2
unless a cat converter has failed and is blocking the exhaust system they do not increase/ decrease back pressure
they do not put stuff back in the motor to damage the engine as the exhaust gas flow blows the bits out the exhaust pipe
gutting the cat converter is a waste of money as it is needed for the ECM to set the correct air/fuel mixture for optimum economy and performance
It works like this, the ECM sets a mixture that is burnt in the combustion process--the first sensor ( heated oxygen sensor reads the exhaust gas emissions and reports to the ECM which then adjusts the mixture to preset parameters or fuel trim The cat converter burns the emissions and the final oxygen sensor (O2) reads the end result and reports to the ECM as a final fuel trim
the cat converter is placed as close to the engine as possible so that they get hot enough to burn ( and they do burn at a very high temperature) so putting one further back in the system would be a total waste of money as it would eventually carbon up and restrict gas flow
so this is how it stands
1-- failing cats do not damage engines-- but will affect the back pressure by blocking the exhaust pipe
2--- cats are essential part of the economy/power process
3--- the car is designed for maximum power and performance with the cat in the right place ( not further along the system
4-- a cars exhaust system is designed and tested by qualified engineers in controlled conditions to get optimum back pressure requirements for the fuel trim set in the ECM
5 ---listening to "mates" about modifying the system will cause you problems with vehicle inspectors and that will be a cost on your wasted money
7-- here is a tip about back pressure
back pressure is used to get the low pressure area caused by the expulsion of the hot gas out of the end of the pipe to return to the exhaust valve so that when the valve opens there is a vacuum that sucks the burnt gas out of the cylinder and sucks more fuel mixture in --- read books on exhaust pipe and header tuning and you will get the message

Aug 17, 2016 | Nissan Cars & Trucks

1 Answer

Toyota voting front ex pipe getting too hot too quick note cat

which toyota engine
front exhaust manifold and pipes always get hot quick
even more quickly if have taken out the cat and bolted in cat delete pipe


Jun 08, 2016 | Toyota Cars & Trucks

1 Answer

I have a Toyota quantum voting 2008 model the front pipe of the exhaust gets red hot within minutes and the exhaust bafflesystem burn out after a month or two this is the 3rd ex any ideas

Baffle system? When exhaust gets red hot, usually means your catalytic converter is clogged, but, ive seen instances where a muffler had gotten clogged and was doing the same thing! Aside from the, air/fuel mixture being off could also potentially cause this!

Jun 08, 2016 | Toyota Cars & Trucks

1 Answer

Why is gas leaking out of my muffler?

Because the engine has an over-rich condition that is causing liquid fuel to pass completely thru the engine and get pumped out the exhaust. This is an extremely dangerous condition for many reasons.
1 - leaking fuel in a usually hot exhaust system can ignite, explode its fumes under the vehicle, or subject passengers to hydrocarbon fumes,
2 - if enough fuel is in the exhaust to leak oiut a muffler...and it came thru the engine, there is a distinct possibility of internal engine damage occurring at any time. The pistons normally compress a mixture that is more than 85% air. Air is compressible (meaning you can make it physically smaller by squeezing it at great pressure). Liquids by their nature ARE ABSOLUTELY NOT COMPRESSIBLE!!

What this means is if you have a leaking fuel pressure regulator (kinda common on older ones) or leaking/stuck injectors (less common but still happens) or simply a defective fuel control system that is commanding ridiculous amounts of fuel (rare!), if it exceeds the compressible space in the cylinder for incompressible fuel volume,,,something will break or bend and quite possibly destroy the engine.

3 - if you have enough gas to flow liquid out the exhaust, you are at the very least damaging the catalytic converter which can run hundreds to even a couple of thousand dollars to replace. Further, your mileage is AWFUL right now because despite what people think, cars run on very small volumes of fuel. as in an eyedropperfull per rpm. Now imagine 100x normal fuel useage. Thats probably what you have to have it leak out a muffler. Think prevention, in addition to destroying the engine, it kills mileage, performance, detsroys cats and O2s, rings, seals, valves, sometymes purge systems or pcv systems. It should be repaired asap to prevent more costs si\oon.

May 04, 2015 | 2000 Ford Taurus

3 Answers

Truck backfires when going up a hill and loses power, makes noise like a busted tail pipe. Took it to a muffler shop and was told it was my converters. Is this a posibility?

Yes it could be your convertor when the convertor breaks inside it breaks chunk and those chunk bloke the exhaust so no power

Mar 28, 2015 | Cars & Trucks

1 Answer

2000 Jeep Grand Cherokee back fire

Backfiring is caused by unburned fuel igniting in the exhaust system, which could be the header, catalytic converter, muffler or exhaust pipe. Red hot is caused by the burning fuel. You either have a timing issue or you are not getting enough air flow into the fuel injection system, which can happen for several reasons. I would try to find a good local mechanic and pick their brain.

Dec 28, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Catalytic converter stopped up. Pipes got red hot. Replaced Cat. Conv. car runs good, then started random misfires, pipes got red hot again. What is exhaust part that is downstream of Cat. Conv. could it...

If the exhaust system was plugged the engine wont run, normally. It will start and idle until the back pressure is such that it can't take in more air/fuel mixture and then stall.

After the converter, there may be a resonator, and then the muffler. Is any exhaust flowing out of the tail pipe? You might try hooking up a scanner and see what your oxygen sensor(s) is/are doing.
Also, scan the MAF(mass air flow) sensor assembly.
Sound like the engine can't breathe, and its getting to much fuel.

Aug 15, 2011 | 2003 Oldsmobile Alero

1 Answer

Fails the NO ppm test in 1999 cavalier. Already replaced catalytic converter and O2 sensor.No EGR valve. Any ideas?

A couple of things; you can't have any leaks in the exhaust system, in front of the cat, and you must have the correct mixture going into the engine. The cat must have at least .45% CO going into it in order to reduce NOx. Make sure you have the correct fuel pressure, good fuel filter, and the engine is not running too hot when you take the test. In fact you may want to try a cooler thermostat. The oxygen sensor is only a fuel trim device, the bulk of the systems fuel control is dictated by the MAF and MAP sensor if it has one. Bottom line; your engine is running too lean or there is air getting into the exhaust system before the cat. You may want to try another MAF sensor if you know the other factors are good. If you have access to a gas analyzer, drill a pre-cat hole and check pre-cat CO under load, at least .45% is critical.

Jul 20, 2010 | 1999 Chevrolet Cavalier

2 Answers

My 2000 ford expedition would run and then start to jump and then shuts off....what can be causing this...?!

sounds like a coil pack going back ....they work ok while cold but once it gets hot it stops putting spark out causing car or truck to stumble and stall and not start back up till it cools back down. Or it could be a bad fuel injector either clogged which would cause a lean cond. that would also make engine temp. higher then normal that over time will burn out a cat. converter which will choke the engine also or leaking tip which would make for poor gas mileage -rich, gas mixture and also cause a soot-black looking exhaust ,to check if cat. is back you can simply unhook exhaust before it reaches the cat and see if it will stay running then if it does then the cat is melted down -bad and need replaced if not something else like stated above is your problem.

Dec 01, 2009 | 2001 Ford Expedition

1 Answer

96 grande cherokee 6cyl. replaced o2 sensor and code still shows bad sensor so changed out again thinkjhg it was faulty but code still shows bad sensor.Drove for while and back fires to the point were...

Sounds more like an ignition misfire. Sometimes also, an exhaust leak in the pipe above the sensor can add enough air to cause the mixture in the pipe to ignite and cause the same problem. The first "weak point" in the exhaust is the muffler which is why it blows it up. Cutting out the cat will not solve this.

Oct 28, 2009 | 1996 Jeep Grand Cherokee

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