Running lean help with diagnostic - 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 10-06-2007, 04:44 PM   #1
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Default Running lean help with diagnostic

Ever since I sea foamed my engine which was about a month ago, I've been running lean. After the seafoam I changed my plugs and oil within 4 hours, I gave NGK a second chance.. 2 days later I was running lean, so lean that when I turned a corner the car would stall. I pulled the plugs out and they were white as ever, they looked painted! so I put the delco'* back in since they wasn't that old. 2 weeks later I decided to switch over to autolites because I was going to invest in they're iridiums and my front (delco) plugs show signs of running lean while the rear was ok.

Now I have the autolites in and I'm going on 2 weeks with them. My HP is sluggish like I'm running lean. Back when I was pouring the sea foam in the vac line to let it stall out, I heard a loud pop in the evap canister area as it stalled. Maybe it was the canister or maybe it wasn't. Could anyone help me out with some luck.
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Old 10-07-2007, 12:38 AM   #2
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How do you know you're running lean? You have a scantool? If so, what are your LTFT'* and STFT'*?

What'* your fuel pressure?

Turning and stalling has nothing to do with running lean. 92 fuel tanks are known for that.
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Old 10-07-2007, 01:18 PM   #3
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I don't have a scan tool, I pulled my plugs and the tips are kind of white. My exhaust tips are kind of white too, but that could've been from when I sea foamed since only white smoke came out the exhaust.
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Old 10-07-2007, 01:41 PM   #4
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You REALLY need to find a scantool...somehow, someway. It has as much worth, if not more worth, than a factory service manual. You can have one or more of many possible issues, and without any scan data, it may take us a while to figure out, and alot of blind shootin'.

I suggest a test that a nice admin did for me...unplug your MAF. Does the idle change for the better? Drive it around for a few minutes...does it feel more responsive? If it does, start lookin' for another MAF sensor. Again, this may or may not be your problem, but there is nothing wrong with eliminating or confirming the MAF.
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