I replaced the EGR Vacuum and the EGR Valve and my Check engine light still keeps flashing the code "7-1" which for my 94 toyota pickup means that there is still an issue for the EGR system. What have I done wrong? How do I turn off the check engine light? Is there a reset button for the check engine light?
Yes, you need to reset the codes by disconnecting the battery negative terminal for about 15-20 minutes with the ignition key ON. Turn OFF the key, connect the cable again and turn the key. The CEL will turn off.
I have a different problem with my EGR valve vavuum ,it leaks oil ,what can couse this ?
Regards Eric
SOURCE: Service engine code indicates EGR valve.
You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.
SOURCE: Check Engine code P1409
clean the egr valve port on intake use piece of clothes rack clean the built up carbon on inside of port.
SOURCE: Code P0401 toyota Camry 3.0 v6
replace the vsv that has the vacuuum hose running from it to the egr valve
SOURCE: Toyota Corolla DX 97 Engine Light EGR valve PLEASE HELP
You can try cleaning the EGR valve and passages with Seafoam. A bottle costs just a few dollars at any auto parts store or discount store. With the engine running, squirt/spray it in through the brake booster hose, or through the PCV hose. This will cause smoke to come out the exhaust. This is normal and will disappear after a few minutes. If Seafoam does not do the trick, then you can still disassemble the EGR valve from the throttle body and clean it with throttle body cleaner.
Frank
Frank's Friendly Cars Maui Car Rental
www.mauicarrental.biz
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.
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