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Does a clogged exhaust system burn pistons? - Cars & Trucks

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It's possible, heat backing up and causing pressure/temp increases. Injectors failing is common and over rich fuel mix or bad octane fuels.

Posted on Dec 17, 2016


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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

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1993 Camry - won't Rev past 2000 and loses power ...

A major vacuum leak could the problem. Anything restricting the intake flow, a dirty throttle body or stuck EGR may cause similar problems. Possibly a clogged catalytic converter or a muffler baffle that has come loose clogging the exhaust. Last on the list is improper valve timing, a stuck or burned valve or other major engine problem like a hole burned in a piston. A compression test may help pinpoint the problem.

Feb 05, 2015 | 1993 Toyota Camry

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Thank you for your response bill boyd i suspect egr the tubes at the block and intake clogged could this have caused burned hole in #2 piston 1996 sentra 1.6 ?

It is possible as it will alter the air/fuel ratio. The EGR valve is designed to re-admit exhaust gas into the manifold so as to slow down combustion by the introduction of already burnt gas or partially burnt gas to obtain the correct exhaust mixture for pollution requirements. I would still check the tops of the pistons for the indents as it will affect all the pistons although the weakest piston failed.

Jul 22, 2014 | Cars & Trucks

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My 2008 chevy avalanche is burning 1 quart of oil every 1000 miles

How many miles on your vehicle ? Do you see any leak spots on the ground from the truck ? Blue exhaust , oil burning , valve guide seals , piston rings , PCV clogged .

Oil Consumption Diagnosis
Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles).
The causes of excessive oil consumption may include the following conditions:
• External oil leaks
Refer to Oil Leak Diagnosis .
• Incorrect oil level or improper reading of the oil level indicator
With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time, 2-3 minutes, and measure for the correct engine oil level.
• Improper oil viscosity
Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.
• Continuous high speed driving and/or severe usage
• Crankcase ventilation system restrictions or malfunctioning components
Refer to Crankcase Ventilation System Inspection/Diagnosis .
• Worn valve guides and/or valve stems
• Worn or improperly installed valve stem oil seals
Refer to Spark Plug Inspection .
• Piston rings broken, worn, or not seated properly
Allow adequate time for the rings to seat.
Replace worn piston rings, as necessary.
Refer to Cylinder Leakage Test .
• Piston and rings improperly installed or not fitted to the cylinder bore
Refer to Lower Engine Noise, Regardless of Engine Speed

Jun 14, 2014 | 2008 Chevrolet Avalanche

2 Answers

2006 chev colorado Oxygen sensor burns out

Are you getting a trouble code for the sensor ?
Under normal conditions the tip inside the exhaust will look burned from the high heat of the exhaust gas, but nothing should be melting.
A fuel injection system can not vapor lock, but a leaking injector can cause the exhaust to be too rich. Same thing if the air filter is clogged up.

Mar 02, 2013 | 2006 Chevrolet Colorado

1 Answer

My VW passat is using oil but its not leaking ? What might be the cause

The oil is probably being burned by the engine and going out the exhaust. Reasons for this are:
Bad valve seals
Worn valve guides
Pressurized crankcase due to a clogged PCV valve or breather system
Blow-by from worn piston rings & low cylinder pressures.

I hope this answers your question.

Sep 03, 2011 | Volkswagen New Passat Cars & Trucks

1 Answer

I have a 79 jeep cj5 with a 304 and im getting alot of white exhaust smoke after the motor warms up rebuilt the carberuter new plugs wires cap rotor and new coil

White smoke is often times the result of "oil burning". What happens is that instead of the oil control rings on the pistons pushing the oil down into the oil pan, these rings over the course of years become pugged up, as a result the oil control rings "fling" the oil onto the spark plugs causing the oil to get partially burned off in the combustion process causing your simptoms There is only so much you can do to stop this. One thing you might try first is go to the automotive store and buy a crankcase cleaning system. What this does is cleans the inside of your engine including the pistons rings and washes all or most of the gunk in the engine into the oil pan. WARNING: excessive gunk in your oil pan can clog your oil pick up tube depriving your engine of oil, this will cause it to seize up leading to your last resort in fixing what might be your problem, rebuilding the engine. Make sure to follow the manufacturers guidelines when using a crankcase cleaning system.

Jul 16, 2011 | Jeep CJ5 Cars & Trucks

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Try a few if these ideas...

Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration

Apr 18, 2011 | Chevrolet Cavalier Cars & Trucks

2 Answers

My 2003 altima 2.5sl has the check engine light on....... after new plugs and the front o2 sensor changed it is now reading the cat !!!!!!!! now im also using ...

THe engine is burning oil and fouling the sensors and clogging the converter. This could be caused be a faulty PCV valve, bad valve seals or piston rings, This condition only gets worse = as the converter clogs it puts back pressure in to engine and forces motor oil back into the air intake thru either the PCV passage or vent breather tube. You can try to clean some of crud out of the converter and exhaust system with a good additive like Seamist or Techron, etc. The underlying cause will still cause it to clog again is you don't repair the root problem.

Mar 28, 2011 | 2003 Nissan Altima

1 Answer

Oil consumption

Bad valve seals
Worn valve guides
Pressurized crankcase (oil pan) due to a clogged PCV valve or breather system
Blow-by from worn piston rings

Bad valve seals: The valves are located in thecylinder head above the combustion chamber. Oil is pumped at 50 to 80 psi of pressure into the top of the head, lubricating the valve-train; the valveshave seals on them to stop the flow of oil down into the engine when the valve is open. If the seals fail, oil is allowed to flow down into the combustion chamber and is burned.
Worn valve guides: The valves are guided by a small cylindrical chamber called a valve guide. These guides wear over time causing eccentricity (or slop); the excess gap allows the flow of oil down the valve stem into the combustion chamber to be burned. What about the valve seal you say? Well, the gap is too great for the seal to stop the oil flow, so down it goes to be burned.
Pressurized crankcase due to clogged PCV or breather system:The car's engine is a giant pump, consequently it must breathe. The PCV (Positive Crankcase Ventilation) system does just this, allows the engine to exhaust the excess pressure build-up (which is a natural phenomenon of the internal combustion engine). Carbon build-up is a by-product of an engine and can build up in the PCV system, clogging the breathing passages. This in turn pressurizes the oil pan and pushes oil up into the fuel delivery system, where it is fed into the engine and burned.
Blow-by from worn piston rings: The pistons in your car's engine have seals around them in the form of rings. These rings do two things:
  1. Seal the combustion chamber so the precious power developed from the firing of the cylinder is not lost.
  2. Provide vital lubrication to the cylinder walls.
When the rings wear out, the pressure from combustion reverses down into the oil pan, pressurizing it and forcing oil into the valve covers, through the breather system, back into the fuel delivery system, and into the engine to be burned.
You may ask yourself, "What can I do to stop this from happening?" Keep your oil and filter changed every 3,000 miles and keep the air filters changed every 12,000 miles!! This will keep sludge and carbon buildup down to a minimum. Understand that you can't stop mechanical wear, but you can slow it down!

Jan 15, 2009 | 2000 Saturn SL

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