'96 Saturn EGR valve - clean or replace?

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Old 04-20-07, 12:19 PM
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Question '96 Saturn EGR valve - clean or replace?

so i've got a 1996 Saturn SL2. it runs fine, until i stop at a red light. then it starts to idle rough, and then dies altogether. the 'check engine' light is on the whole time. I took it to Autozone and they hooked the diagnostic scanner to it, and the codes indicated that there's a problem with my EGR valve. after seeing the $190 price tag, i promptly left.

one of the guys at work suggested getting a wire brush and cleaning out the valve, but i found a salvage yard nearby that can get me a valve for about $20, and i'd just have to switch it out myself.

anyone ever have to do this before? what's the most likely option to succeed?
 
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Old 04-20-07, 05:02 PM
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Either way you would have to remove the old valve first and when you do you may find it DOES just need cleaning. I would remove it for inspection before getting the replacement part; might save yourself $20. Also be sure to inspect the vacuum lines into & out of the EGR solenoid and to the valve before you do the valve. Sometimes an egr problem can be nothing more than a split vacuum hose.
 
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Old 04-23-07, 08:23 AM
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thanks. turns out the valve itself was bad, something inside was rattling like hell. i changed it out, and the car doesn't stall anymore, but the Service Engine Soon light is still on. i disconnected the battery for about half an hour, thinking that would clear the computer, but it didn't work. looks like i'll be checking vacuum hoses later.
 
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Old 04-23-07, 10:37 AM
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Cool vacuum leaks

I light up a cigarette and blow smoke into vacuum hoses, that way you can see the smoke if something is leaking
 
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Old 04-23-07, 04:40 PM
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That's an OBD-II vehicle; disconnecting the battery will not reset the light. You need to either use a scan tool to reset it or drive a certain number of "cycles" before it will reset itself. Sometimes turning the key off and on a bunch of times will do it, too. I wouldn't sweat any more troubleshooting until you reset the light and see if it stays off.
 
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Old 04-24-07, 07:00 AM
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thanks for the input guys. i'll try swinging by autozone or the saturn dealer and see if i can get this thing reset.
 
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Old 04-25-07, 10:06 AM
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so much for that.

had it checked again, and it came back reading that the EGR flow sensor is showing a low input voltage. anyone know how to deal with this? is it maybe something as simple as cleaning the contacts where the wire plugs into the top of the valve?
 
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