Question about 2001 Oldsmobile Alero
Check engine light on - code shows EGR valve is the problem - can it be repaired by me - could i clean it or must it be replaced ? is this do-able by a shade tree mechanic ?
Yes you can do it yourself the egr valve is located on the exaust manifold closest to the fire wall unfortunately it has to be replace. it has an electronic lead to it and is vaccum operated to replace it is not a difficult task. the part can be purchased at a Napa or Oreilly's for alot less than at a dealership. just make sure your gasket surfaces are clean for replacement of new gaskets. if you have a code reader than can reset the code that is a benefit however if you do not you have to have a scan tool to reset the code. please rate the solution....thanks
Posted on Sep 19, 2008
My 2001 alero has started to skip when accellerated like passing or going up hill
Posted on Oct 13, 2008
You need to clean the egr port remove egr valve and it is easier if you remove throttle plate you will see the port with carbon built all up on it in plenum this is a common problem
your valve is probably fine
Posted on Sep 19, 2008
Egr valves are not that expensive. yes, you can change it yourself. google or buy the haynes repair manual. the only thing is that you may bust a knuckle or two in doing so. most egr valves are easily accessible and are two bolts/studs and an exhaust tube. be careful not to break the tube though, it leads down to your exhaust and will not be so easy to repalce. if you own a can of propane or map gas it will make it easier to remove (the tube). it gets hot so don't worry about the heat, just becareful where you aim it and where the heat spreads to (around the egr).
Posted on Sep 19, 2008
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Posted on Jan 02, 2017
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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).
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.
SymptomsThere 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.
CausesUsually this code points to either carbon buildup or a bad EGR valve. However that doesn't rule out the following:
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