Question about 2005 Chrysler 300
Just replaced EGR valve.... now having cyl. 5 misfire?
also PCM determined that voltage signal from EGR sensor "a" is to high for the current engine operation conditions?
What could have caused this to happen? Safe to drive?
If this is an electronic EGR valve which is opened and closed by the PCM, then it may simply have to relearn the fully closed setting for idle, and it can sometimes be done by switching off the ignition, disconnecting the wiring plug from the EGR valve, and then resetting the fault codes with a scanner.
Now here's the important bit, the very second the scanner tells you the fault codes are cleared, quickly switch off the ignition. This will prevent the PCM from setting another code.
You can then reconnect the EGR valve and hopefully the lesson will be steadfast in the PCMs memory!
As for the cylinder 5 misfire, if it is still misfiring then you need to check for spark, fuel, and compression in that cylinder.
Run the engine for a minute and then whip out the no.5 spark plug. Is it dry or covered in fuel? If its covered in fuel then you have a spark problem, and if its dry then you have a fuel problem.
If its a spark problem and the plugs each have their own coilpack, then it is very highly likely the coilpack at fault, and in which case it is best to fit a new plug as well as a coilpack.
If its a fuel problem then it is very highly likely the injector at fault but you should check for a supply and earth pulse at the injector before condemning it, because sometimes the injector loom becomes crimped and damaged.
It could be a compression problem, but I doubt it, however, just to be safe you may want to carry out a compression test on that cylinder before throwing parts at it.
An easy way of determinig injector and coilpack faults is to move the suspect part onto another cylinder and see if the fault code follows it. If it does then you know that component is faulty.
Posted on Jun 23, 2008
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Exhaust Gas Recirculation Circuit Range/Performance
What does that mean?
The EGR (Exhaust Gas Recirculation) system's purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine's performance. (Too much EGR and the engine won't idle).
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If you have a P0404, then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set.
There may be no symptoms of a P0404 DTC other than the MIL (malfunction indicator lamp) or check engine light. However, Exhaust Gas Recirculation systems are inherently problematic due to carbon buildup in the intake manifold, etc. This normal buildup can lodge in an EGR valve, holding it open when it should be closed. If this is the case, the engine may idle rough, or not at all. If the valve has failed and is NOT opening, then symptoms would be higher combustion temps and as a result, higher Nox emissions. But the latter symptoms aren't going to be noticeable to a driver.
Usually this code points to either carbon buildup or a bad EGR valve. However that doesn't rule out the following:
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