2 o2 sensors? - Page 4 - 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 12-28-2010, 01:44 PM   #31
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Oh yeah it sounds and feels like something is moving in there. Do you know what tells the PCM to open the EGR valve? I would assume the o2 sensors?
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Old 12-28-2010, 01:46 PM   #32
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Coolant temp.
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Old 12-28-2010, 01:50 PM   #33
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I'm not for certain about this but dosent your car have to be moving (speed sensor) also for the egr to operate?
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Old 12-28-2010, 01:54 PM   #34
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Some cars use speed, but I do believe this one uses temp. I would have to look at the tune to be sure.
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Old 12-28-2010, 02:06 PM   #35
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Coolant temp really? I never would've guessed that. I recently changed my water pump and now the car runs alot cooler(not to mention it'* been cold as hell in Orlando recently) I wonder if that'* why the EGR isn't opening? Or do you guys think the coolant temp sensor is bad?
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Old 12-29-2010, 11:50 AM   #36
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Hey Dan do you have a write up on how to test the MAP sensor?
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Old 12-29-2010, 11:54 AM   #37
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I do not have a write up on the MAP. What is your temp gauge saying? If that'* wrong it will cause all kinds of problems because the PCM uses engine temp for a lot of tables, such as engine idle speed.
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Old 12-29-2010, 12:26 PM   #38
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Before I changed the water pump my temp gauge was reading 200 to 220 at stop lights. After I changed the pump it reads around 180. But I see what you're saying about the gauge, I think I'll change the coolant temp sensor and see if that helps the damn thing is only 15 bucks. But does the temp gauge in the dash run off the temp sensor that the PCM uses?
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Old 12-29-2010, 12:55 PM   #39
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There is only one temp sensor, so yes.
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Old 12-29-2010, 01:14 PM   #40
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Is it in the the block or the radiator?
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