2 o2 sensors? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-12-2010, 02:41 PM   #11
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I turned the key to the point when I heard the fuel pump kick on,then I disconnected the EGR and heard nothing. I did it about three times and still heard nothing. I didn't start the engine because I wouldn't be able to hear anything. I assume it should sound like a ''ping" or something right?
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Old 11-12-2010, 02:47 PM   #12
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Just a click, you may need to put your hand on it to feel it.
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Old 11-12-2010, 03:08 PM   #13
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Here, I made a write up to test the solenoid. It'* really easy to do.

https://www.gmforum.com/showthread.p...48#post1490248
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Old 11-12-2010, 05:57 PM   #14
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Damn this forum is a life saver! I'll try it tonight Thanks Dan.
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Old 11-12-2010, 10:30 PM   #15
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I tested the EGR tonight and it opened and closed fine,I'm sure that if it was working in the car I would've heard it open and close. I'm thinking a possible wiring problem maybe there'* a loose wire near the plug
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Old 11-12-2010, 10:43 PM   #16
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Chances are if it works with battery, it will work in the car, unless the plug is bad.
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Old 11-14-2010, 02:39 PM   #17
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Does anybody know where I can find the plug at? It'* an oval shaped five pin, I can't find it for some reason at my local parts stores.
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Old 11-14-2010, 03:09 PM   #18
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www.rockauto.com should have it.
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Old 12-26-2010, 02:16 PM   #19
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I finally changed the egr plug today and there is no difference. I tested the old plug with a continuity tester and it worked fine, I even tested the exposed wires coming from the wiring harness with a volt tester and didn't detect any voltage. So what do I do now? Is there a relay that might be bad? Or a bad fuse? Or maybe a bad wire inside the harness?
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Old 12-26-2010, 02:34 PM   #20
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OK, this is going to get a bit more involved here, so I will do my best to describe it.

At the EGR plug you have 5 wires

Black is signal ground, you should have continuity between that and ground.

Gray is 5v reference signal, If no signal then test continuity between that wire and pin 29 on the blue PCM plug

Pink is part of the EVAP system, test between the plug and pin 68 on the blue PCM plug

Brown, test between plug and pin 65 on the clear PCM plug

Looks like there are 2 gray wires, you will need to test both.

Symptoms of a problem with the gray wire is lack of power, rough idle, and chugging

Symptoms of a problem with the brown wire is incorrect idle, cuts out, chugging.
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