SES Light Blues - 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 12-29-2010, 12:02 AM   #1
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Default SES Light Blues

Well first I want to say thanks to Bill and Dan for there previous posts on my issue. They have been very helpful in trying to track down my problem. As of now my car is still reading the P0171 System to lean bank one code. Steps taken so far.

1. Checked Negitive battery cable for corison.
2. Cleaned MAF sensor.
3. Looked for vaccum leaks and replaced all lines that were brittle and worn.
4. Replaced EGR to LIM tube that was cracked.

Now I thought I had the problem solved, but the light came back on tonight when I came home from work. I drove the car last night after installing the new EGR tube and for about 20 miles today no light. Once the car sat and got cold, real cold, the light came on before I got out of works parking lot. So any thoughts? Still don't have PSI gague for fuel rail, but the pump, sending unit, filter, pressure regulator, were replaced just about a year ago.
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Old 12-29-2010, 12:06 AM   #2
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One area that can cause this code and is a real pain to locate is the EVAP system. Locate that vacuum line and cap it off at the throttle body. See if that corrects the code. If so, then the problem is in that vacuum line.
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Old 12-30-2010, 12:02 AM   #3
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Okay so I capped off the EVAP system at the throttle body and so far so good. The weather is warmer now so I am going to wait a few days to see if it comes back on. I will not have access to Mitchells On Demand till i return to school mid month. Does anyone have a diagram of the evap system? I need to reference what needs to be checked/replaced. Has anyone ever replaced/repaired there evap system vaccum lines?
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Old 12-30-2010, 01:33 AM   #4
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I replaced all my vacuum lines. As for the EVAP, I suggest just replace them one at a time. Get a roll of generic hose and cut to length what you need.
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Old 12-30-2010, 11:26 AM   #5
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This may help
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Old 01-01-2011, 04:38 PM   #6
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So its been a few days now and still no light with the EVAP vaccum lines capped off. Nighthwk thanks for the diagram it was very helpful. Question though, should there be a line that runs from the fuel tank to the charcoal canister. I kinda have a feeling it must be somewhere further on back.
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Old 01-01-2011, 05:07 PM   #7
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Yes, there will also be a line from the canister to the tank. If you plug in the line, then cap it off further back to test that area.
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Old 01-01-2011, 07:57 PM   #8
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IIRC that is plastic line to a metal line. I would check all your metal line under your car for rot and corrosion.
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Old 01-02-2011, 11:14 PM   #9
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If needed is it okay to replace the metal line with rubber line?
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Old 01-02-2011, 11:17 PM   #10
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The metal line will hold up better, but other then that, there'* no reason why you can't use rubber line.
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