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Old 08-04-2003, 02:24 PM   #1
Dr. J
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2002 impreza wrx
PSM

Default egr valve

how you you know if you need a new egr valve and how hard is it to repalce?
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Old 08-05-2003, 12:25 AM   #2
Albert
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Start with a cold engine.
Start car and let idle to normal temp
The operating shaft if visible thru the cutout in the egr housing. Watch the shaft while a helper sits in the car and raise the rpm to 3000 rpm and hold, (don't let it drop below 3000 rpm). If it's operating correctly you will see the shaft slide open.


If you end up removing it, best to use a new flange gasket, and the torque is 18 ft/ lbs.
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Old 08-05-2003, 09:32 AM   #3
cavymeister
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Quote:
Originally posted by Albert

If you end up removing it, best to use a new flange gasket, and the torque is 18 ft/ lbs.
Also, make sure that you use some throttle body/air intake cleaner (not carb and choke) and clean out the passages that the EG runs through.
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Old 08-09-2003, 11:11 PM   #4
SubaruImpreza_power
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What is the egr valve used for?
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Old 08-10-2003, 07:47 AM   #5
jlevy
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I believe the exhaust gas recirc valve is used to control NOx levels.

-JL
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Old 08-10-2003, 08:09 AM   #6
Mulder
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Correct, to expand on that-
A small amount of exhaust gas is returned to the intake. This gas, being non-combustible, has the effect of lowering combustion temperatures which results in lower NOx emissions. There is another positive benefit, the lower temp also reduces the tendency for detonation so more aggressive timing can be used when EGR is present. Unfortunately there is a negative effect on throttle response as well as carbon buildup in the engine over time. As engine control technology has improved EGR regulation has gotten better but it is still something of a "necessary evil" on those engines that have it.
I'm very happy that the WRX does not have EGR.
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Old 08-10-2003, 12:43 PM   #7
SubaruImpreza_power
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WTH... the Wrx does not have one? So does that mean I can take mines off?

I bet the stupid little part costs $$$ to replace
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Old 08-10-2003, 07:04 PM   #8
Mulder
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You can't just take it off. Well, you could physically remove it and block off the passages, but the ECU would know it is missing and you would have a constant CEL. The engine may also begin to knock without it because the engine management is designed for the EGR being in place.
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Old 08-11-2003, 12:02 PM   #9
dsc
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Do any of the Subaru engines have EGR?
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Old 08-11-2003, 01:21 PM   #10
SubaruImpreza_power
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Quote:
Originally posted by dsc
Do any of the Subaru engines have EGR?
My Forester 2.5L Has one and my 95 Impreza has one.

As mulder stated His 2.0L wrx turbo does not have a EGR.
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Old 08-11-2003, 08:46 PM   #11
svx_commuter
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My 1997 EJ22, 5spd does not have one.
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Old 08-18-2003, 01:44 AM   #12
sick1.8t
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my '93 impreza with the EJ18 has it.

i cant seem to track where the feed for the exhaust gas comes from. does anbody know?
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