Question about 2002 Oldsmobile Alero

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Where's the EGR valve? is it hard to tune up this car?

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The egr valve is on the left (drivers side) of the engine to the back.

where's the EGR valve? is it  hard to tune up this - ldtrisch_3.jpg

Posted on Mar 17, 2011

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My jeep grand cherokee lardo 1997 runs great than just die and hard to start and when it does it runs find ?


ever do a tune up? sparks, filters, every 60K?
hard starts , in the macro.
1: in bad need of a tune up. RTM read the opr guide, on service points.
2: weak compression. (engine basics)
3: weak spark. (see tune up)
4: bad fueling, too rich, too lean (tests) (lean ? for got the fuel filter?)
5: EGR valve sticking open.


is this the 4.0L engine? the true causes very by which it is.

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if it was your EGR valve there would be a code. does the white smoke has a sweet smell. that is a head gasket problem. if it does not smell sweet try a tune up

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Have an auto parts store check for the code. It is possible that you have a bad O2 sensor or your catalytic converter is clogged.

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Having Car Problems.


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Car hard to start. Car will emit


You could need a tune up. Remove a few of the spark plugs and look to see if they are black with carbon (black hard and flaky residue) or black with oil. When you check it, make sure its sat for at least half the day, but a full day would be best. If its covered in oil then you have bad valve guides and could require major engine work, or just some valve seals to stop the leak. The bucking and backfires could be caused by a faulty TPS or ignition module. Its a start.

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1998 chevy pickup V8 130.000 miles running very rich. Done a complete tune up. plugs, wires cap, rotor, and relplaced one o2 sensor still running very rich. what would happen if the EGR valve is bad?


The Exhaust Gas Recirculation (EGR) valve is an important part of the exhaust circulation system of a vehicle. EGR valves have been in use in the United States since the 1960s, when car companies were seeking ways to increase the efficiency of vehicles while also decreasing pollution. 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, where it can be reused. This is done for a number of reasons. The primary reason is that a certain temperature is required in the combustion chamber, and exhaust is much warmer than air taken in from the outside. As a result, the engine need not work as hard to heat the combustion chamber to optimal temperature. The second reason is that the use of an EGR valve helps to reduce nitrogen oxides, which will combine with elements in the atmosphere to form smog.
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 oxygen 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 alone-it needs atmospheric oxygen as well. 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.


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Mar 26, 2009 | 1996 GMC Sierra

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