97 buick lesbre shakes and jerks at around 30 mph for a few seconds then again at 55 to 60 with very light acceleration egr valve code comes up (cleaned it then ended up replacing it still does it)
Vaccum leak,EGR may is good,check tow lines near thermostat,for crack
SOURCE: engine service light
The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.
SOURCE: 91 nissan Sentra losses power at highway speeds
remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one
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: 2004 Audi A4 1.8 - jerks/jolts while accelerating from 0-20 mph
It sounds like there may be an issue with your ignition system.
Check the ignition wires, distributor cap, spark plugs.
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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