Calling all EGR experts - 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 11-25-2007, 02:34 PM   #1
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My 95 had major PCM and driveablility issues. Lots of codes. I don't own a scan tool for this OBD1.5 so a shop had to fix it. Before they finally determined the PCM was bad, we were discussing the codes and EGR kept coming up. Anyway, after the new PCM was put in, and now the car actually runs again, it threw the SES light about a day later. The same shop checked the codes for me again and said it was EGR and I probably didn't need to worry about it on a car this old with this many miles. The car runs pretty good but I randomly get the SES light.

My question: is there something that can be done to work on, clean, check, etc. the EGR on a 95 SSEi ? I don't think you can clean them. All the manifold tubing is in great shape. I really don't want to buy a new one, I heard they were expensive.
Should I even care about it?

Thoughts and advice would be appreciated.
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Old 11-25-2007, 03:08 PM   #2
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Not an EGR expert, but yes, you should fix it. And yes, you can clean it yourself. You may have to buy a new gasket to put it back together, but often the pintle (valve) only needs to be cleaned of carbon to restore function. A junkyard replacement is another option if after cleaning, yours still does not work.
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Old 11-25-2007, 03:52 PM   #3
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Carb cleaner and a small wire brush works pretty good for cleaning the EGR.
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Old 11-25-2007, 04:39 PM   #4
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I thought the later EGR'* were digital or something and couldn't be cleaned like the early ones.????? Maybe I'm confused.
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Old 11-25-2007, 04:43 PM   #5
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I just had mine cleaned, simple as can be. Take off, carb cleaner + wire brush (as stated before) then put back on. (might need new gasket, of course, but that'* cheap)

I have a 95 SLE, series II N/A, your EGR can clean up just like that also if I'm not mistaken...
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Old 11-25-2007, 05:02 PM   #6
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Quote:
Originally Posted by skregal
I thought the later EGR'* were digital or something and couldn't be cleaned like the early ones.????? Maybe I'm confused.
You got that backwards. EGR'* up through 1993 were Digital, and are very easy to clean. They almost never fail, and just need cleaning every couple years or so as they age.

Your Linear EGR (94 and newer) is a completely different type, and doesn't respond to cleaning as well as a digital valve. This shouldn't stop you from trying though. EGR'* don't come cheap.
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Old 11-25-2007, 05:12 PM   #7
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So Wren, just as a question, kind of on topic I think it'* still appropriate here...

What type of EGR is in my 95 SLE?
What type of EGR is in his 95 SSEI?
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Old 11-25-2007, 05:24 PM   #8
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Its a Linear EGR

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Old 11-25-2007, 05:27 PM   #9
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So linear and digital are cleaned the same way --- it'* just the linear are not very responsive to cleaning......it doesn't usually correct their behavior.???
Do I have it right?
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Old 11-25-2007, 05:33 PM   #10
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The Digital opens 3 different solenoids in varying configurations to achieve the amount of flow the PCM desires for the various engine temps and engine load...

The Linear is a step motor of sorts and the PCM can vary this EGR in steps or in a linear manner giving the PCM the ability to almost have the EGR flow what ever the PCM desires..

So the linear is a Single Pintle that opens at different rates..... You will never be able to clean the Linear anywhere near as good as the Digital.... But for what it costs to replace a Linear, its always worth a shot... And no, this does not always correct the behavior.

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