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Old 07-01-2004, 04:26 PM   #1
1993
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Default EGR or solenoid for sure?

93 sl-1, single cam motor, getting a code 32 wich is for the EGR, i unplugged the vaccuum line from the EGR, pushed up the plunger in the valve and put my finger over the nipple on the EGR housing and the plunger stays up as long as i hold my finger over the hose nipple, so i am assuming the EGR valve itself is good and the solenoid is what is bad???? Just want to be sure because the dang solenoid is 34.04 from the dealer!! Or is the autozone solenoid good enough or is it one of those things where the dealer item is better to use?
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Old 07-01-2004, 07:48 PM   #2
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Did you try to clean the EGR valve?

EGR solenoid's code is 26...

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Old 07-01-2004, 08:43 PM   #3
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but the EGR valve works..? The plunger moves up and down and if i push it up and then plug the vacuum hole in it, it will hold itself up until i let my finger off of the vacuum tube, doesnt that mean its good? i remember that was the old way of testing them, the one on my truck is bad, it wont stay up wheni plug the vacuum tube..?

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Old 07-01-2004, 09:19 PM   #4
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There are more tests than the one you tried. It could still be plugged if you're trying this on a not running engine. Read this thread for more tests. ..

http://www.saturnfans.com/forums/sho...threadid=24751

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Old 07-03-2004, 07:42 PM   #5
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ok, when exactly is the EGR supposed to operate, when revving or decelerating or what? I want to know so i can check it with the motor running..?

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Old 07-03-2004, 08:17 PM   #6
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If you do the tests in the link that gdelgrego provided you will be able to eliminate the EGr valve. Are you getting any other codes besides 32?

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Old 07-03-2004, 08:31 PM   #7
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Quote:
Originally posted by 1993
when exactly is the EGR supposed to operate
The tests in the link are the proper way to verify valve operation, but since you asked (and it may help someone else), the vacuum EGR operates when (from a '93 FSM):

Coolant temp > 122 F for SOHC or DOHC with manual tranny. For DOHC with manual tranny, temp > 104F.

AND

Idle speed > 4% TPS

These two conditions trigger EGR ON and activate the EGR solenoid. The actual amount of EGR flow is controlled by the ratio of engine vacuum to exhaust backpressure, that is why any pluggage in the EGR system will affect operation even if the valve is opening/closing when commanded.

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Old 07-03-2004, 09:50 PM   #8
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Good description^ Code 32 generally indicates a LACK of EGR function. (Bad solenoid or valve) Code 26 AND 32 generally indicates a solenoid shorting to GROUND causing no EGR function. A solenoid NOT shorting to ground, but inoperative, will generally result in a code 32 ONLY.

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Old 07-04-2004, 07:05 AM   #9
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i tried this also, i disconnected the vacuum hose from the EGR and revved the motor up, there was vacuum at the hose when i revved it..

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