Might try resetting the system by disconnecting the battery lead for a few minutes. The system may be confused with the disconnection and new install, so removing power may reset it. Also, there is a engine light reset switch under the dash. Not exactly sure right where it is, but it is just a simple switch that can be moved from one side to the other. Like a toggle switch, but smaller. This resets the engine light headache and starts a new counter for the next time it lights up for something. Mitsubishi placed these switches on all there vehicles. My 86 truck has it right behind the speedometer under the dash. I use to have to switch it every 50K miles because it was programmed to turn on in that time range. I finally got tired of it and removed the bulb from the engine light warning thing. I don't suggest you remove the bulb,, but I do suggest you look under the dash for that reset switch and flick it to the other side for normal reset procedure.
SOURCE: service engine light is on,
P0420 is a catalytic converter inefficiency code for bank 1. It has nothing to do with the EGR valve. It usually means that the catalytic converter is no longer functioning as intended and usually needs to be replaced in order to solve the problem.
What year, make, model, and engine size and what is the current mileage? Emissions warranties are much longer than vehicle warranties.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: how to clean/check the egr valve
When the EGR VALVE is
clogged or malfunctioning, it can cause irregularities in engine
performance such as rough idling or valve
knock, indicating that the EGR
valve should be
inspected.
The EGR valve works by routing a
small amount of exhaust back into the combustion chamber. When the
temperature in the combustion chamber is too high, nitrogen oxides
are produced, which combine with elements in the atmosphere to form smog. Introducing a
small amount of exhaust into the system reduces the temperature in the
combustion chamber, reducing the amount of nitrogen oxides produced.
Many EGR valves are
mechanical, and simply have a small valve
which opens to allow exhaust into the combustion chamber and closes
when it is not necessary, and to keep the air mixture optimal for
combustion. Some mechanical versions will not open until there is
sufficient back pressure, ensuring that the valve
will not be open when the engine is idle or warming up and needs a
higher concentration of oxigen for
combustion. Electronic EGR
valves are also available, and use electronics to regulate the valve.
If the EGR valve is stuck open, it
will essentially cause a vacuum leak, leading to inefficient
combustion, rough idling, hesitation, and sometimes stalling in extreme
cases. This is because the car cannot combust on carbon dioxide
from the tailpipe — it needs atmospheric oxygen. If the combustion
chamber is flooded with exhaust from an open EGR
valve, it will not
function properly. To check
and see if the EGR valve is stuck open,
have someone idle a parked vehicle with the brake on while you examine
the plunger shaft to see if it is stuck open.
If the EGR valve is stuck closed, emissions of
nitrogen oxides will rise, and the car may start to knock. Spark knock
happens when the fuel mixture in the combustion chamber ignites before
it has been reached by the explosion in the cylinder, resulting in a
disruption of the engine timing. In this instance, the engine should be
warmed up and revved to see if the EGR
valve will move.
In both cases, simple repairs are possible. The EGR valve can be clogged,
and a simple cleaning of a mechanical EGR
valve may solve the
problem. In the case of an electrically controlled EGR valve or a more complex
mechanical problem, replacement of the valve
may be needed. The EGR
valve is an expensive
motor vehicle component, and care should be taken to ensure that it
needs to be replaced rather than repaired. A reputable mechanic should
advise you appropriately.
Failure to repair or replace the EGR
valve will not lead to a
life threatening condition, although it will reduce the life of your
car and increase the potential emissions. Especially in areas which
require smog testing, an automobile with a malfunctioning EGR valve may not pass
HERE can find one video about this subject.
Hope help with this (remember rated this help) Good luck.
SOURCE: My 2004 mitsubishi galants egr
Hi, the "dirt" that clogs your EGR valve and intake manifold is not dirt in the traditional sense. The dirt in this case is carbon buildup from your engine and emissions. When the carbon builds up to a certain point, it hardens and forms a residue. This residue will ultimately clog your intake manifold and EGR valve, stopping them from functioning properly and causing the rough idling and stalling.
Carbon buildup is caused by not burning all the gas going through the cylinders. This can be caused by many different things including using bad gas, driving around in the city too much, and not having enough spark in the engine, but the main cause of carbon buildup is driving too carefully.
Driving slowly and safely and carefully every single day puts a lot of pressure on the engine. Driving like a maniac isn't good for your vehicle all the time either, but occasionally it is good to break out of your normal rhythm.
Unless there seems to be a major problem try to keep the car at a steady acceleration until its ride is nice and smooth. You may need to stop the car and then start over by punching the gas pedal again. This way you don't accelerate past the speed limit allowed on the road. It is the rapid acceleration part that burns off the carbon, not the speed, so don't risk a speeding ticket.
When the vehicle seems to respond to the gas pedal easily and undergoes no more choking, you've gotten rid of the excess buildup. Try to gun it occasionally each month to prevent more carbon from building up. A few minutes of consistent acceleration will keep your engine nice and clean.
If you have a lot of exhaust coming out in a steady stream and it is blue or black, stop accelerating immediately. There could be something wrong with your engine and you don't want to aggravate the problem by trying to burn off the carbon. Different colored smoke means different things. Blue, usually there's oil in your gas mixture. Black usually means you have bad valves in your engine. Take your vehicle to an auto shop and tell them about the color of the smoke and the amount. You probably have bad rings or need a valve job.
SOURCE: How to clean a egr valve from a 2000 mitsubishi
Your new EGR valve (assuming it wasn't defective out of the box), is fine, but the car's computer just needs to have its code 403 cleared. Even though you've corrected the problem, the computer will still light the "Check Engine" light, and store code 403 until the code is cleared using an OBD-II (On-Board Diagnostics 2) code scanner.
Note that the car will function perfectly with its new EGR valve, a lit "Check Engine" light and a code 403 stored. Its just a good idea to clear the code, so that then only NEW problems will become the reason that the "Check Engine" light gets lit.
SOURCE: 01 diamante egr
you have a weak mixture so a fault with the O2 sensors is more likely to be your proble as this is what the codes 171/174 mean and 401 is insufficient gas recycling ,use a multimeter to check the O2 sensors ,so reply if they have three wires or four wires and i will explain how to check them as theyr like 90euros for the 3 wire and 50 euros for the four wire one trade price from a auto factor ,retail?
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