Emissions and Exhaust Systems
EGR Systems
Crankcases and PCV Valves

How does a burnt exhaust valve affect emissions?

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2006-09-16 02:55:56
2006-09-16 02:55:56

You would get high CO's (unburnt fuel) @ idle and @ high speed, Depending on how bad and how many vales are leaking. It would fail most smog tests. You could do a compression test to see whitch cylinder is low. Hope this helps, Ben Parker, San Jose, Ca.

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some of the gases are burnt and reduced befor going to the exhaust

exhaust recirculation valve, helps with your emissions

The EGR valve takes unburnt gas vapors from the exhaust and sends it back through the intake manifold to be burnt. The EGR valve takes unburnt gas vapors from the exhaust and sends it back through the intake manifold to be burnt.

Sounds like a burnt valve, the gas is not burning because of no compression due to burnt valve and gas is pushed out of exhaust unburned

Exhaust valves open at the appropriate time to allow the burnt gasses to escape.

EGR (exhaust gas reclaimer), it is designed to reburn unburned exhaust gases. It helps clean up emissions.

Exhaust camshaft phasing on a VVT (variable valve timing) engine is the adjustment of the exhaust camshaft(valve timing) to what the cylinder needs at that rpm/load to improve power/eff. or emissions.

The exhaust gas recirculation valve uses exhaust gases in order to reduce nitrogen oxide emissions, it does this by recirculating a portion of an engines exhaust gases back to the cylinders.

No, it will not cause smoke from the exhaust pipe. However the leaking oil can drip on the exhaust manifold where it will be burnt and smoke.

I believe you are asking about an EGR valve. EGR stands for "exhaust gas recirculation". This valve recirculates the exhaust gasses back through the intake in order to better burn the gasses and cause less CO2 emissions.

Perhaps you mean EGR valve. It stands for exhaust gas reclaimer. It sends some of the exhaust back through the engine to re-burn unburned fumes for cleaner emissions.

For the same reason the intake valve is larger:The intake charge is driven into the cylinder by 15 psi (1 bar) approximate atmospheric air pressure.The exhaust is driven out of the engine by several hundred to a couple thousand psi of burnt exhaust pressure.

yes, the egr valve (Exhaust Gas Recirculation) device is there to help reduce emissions by resending unburnt fuel and harmful gasses back through the cycle. This also helps the engine burn leaner and cooler.

Exhaust coming out of the airfilter indicates a possibility of a few things. Motor has jumped time. Burnt Intake Valve It can also be that the valve lash is out of adjustment.

The exhaust gas recirculation system (EGR) is an emissions control system that recirculates some of the exhaust gas back into the intake in order to re-burn any excess fuel vapor that leaves the engine. It is basically operated by a valve to control circulation. "Valve lift insufficient" means that the valve is not opening enough to circulate exhaust gas as much as the engines computer deems necessary. The vehicle will not pass an emissions test in this condition.

I believe you mean the "EGR" valve. Exhaust Gas Recirculation valve. It is an emissions control device. When the cylinder temperatures exceed 2500 degrees F the EGR valve will open to allow enough exhaust gas (which is inert) to cool the cylinder. This prevents the formation of NOX, which is a huge contributing factor to smog. An EGR valve takes 5 - 15% of the exhaust the exits your car. You can have troubles with this part due to the carbon build up from all the exhaust passing through it causing the valve to get stuck open or shut. EGR stands for Exhaust Gas Recirculation. EGR systems cause exhaust gas to be recirculated to the engine cylinders. Recirculating exhaust gas will reduce Nitrous Oxide emissions in diesel and gasoline engines. It does not recirculate exhaust gas in order to burn unburnt fuel. The EGR valve is the control valve which regulates the amount of EGR being recirculated. The valve is controlled form the engine management system.

EGR stands for exhaust gas recirculation and refers to the valve which acts as the main emissions control in a car. It helps the car burn fuel efficiently.

Bad EGR, Exhaust Gas Recirculation valve. That is what reduces NoX emissions

EGR valve is Exhaust Gas Recirculation valve that recirculates exhaust gas through the intake manifold to improve emissions. Typically this valve has a electric connector and harness that is computer controlled. If this valve is faulty, it will cause a check engine light to appear, or a service engine light. In some cases, it will make the vehicle run roughly. Does that help you?

Depends on the heads. The size is different for the exhaust valve and the intake valve, and different engines have different size valves. The valves are mechanical devices in the engine heads that open and close. The intake valve opens to let the air/gas mixture into the combustion chamber,. Both valves close the combustion chamber during the compression stroke, and the exhaust valve opens to let the burnt gas out during the exhaust stroke.

The exhaust valve gets hotter than the intake valve.

look at the head with the valve cover off find where the exhaust manifold goes in tha is the exhaust valve or looking at the valves the first one is exhaust then intake then intake ,exhaust,exhaust,intake,intake,exhaust if you have the head off i think the intake valves are bigger than the exhaust

if you have blue smoke coming into the exhaust that means your piston rings are bad and are letting oil into your combustion chamber and then causing the oil to be burned with your air fuel mixture and that's why your exhaust is blue from having that burnt oil dumped out of the exhaust valve and out the exhaust

Pretty sure you mean "E.G.R. Valve" and not ERG. E.G.R stands for Exhaust Gas Recirculation Valve. Instead of letting all of the gas out of the exhaust of the vehicle after the mixture is burnt in the compression cylinder, some of it is recirculated into the intake manifold. This is done because not all of the vaporized gas is burnt out of the mixture that goes into the compression cylinder. So this recycles some of the unburnt mixture, and reduces the amount of pollution emitted by your vehicle.


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