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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 10-01-2008, 03:11 PM   #11
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anyone have any ideas on these codes? i tried lookin them up on google and found that the PO321 code has to do with spark and from what i read the PCM needs to be replaced is this true?
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Old 10-01-2008, 03:42 PM   #12
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The 18X you mention is on the crank sensor. This points to a bad sensor. The PRDNL code is common to see with a bad crank sensor as the car dies and restarts on it'* own in gear and the pcm tosses the PRNDL issue.

At this point your best course of action seems to be replacing the crank sensor.
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Old 10-01-2008, 06:30 PM   #13
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I had the same problem on my 96 SE with only 69K miles. I went to Advance and had them check the codes. Got the same codes and did some research. It'* your crank sensor. I replaced mine and it went away. Car ran like a champ. You will have to remove the harmomic blanancer which was pretty hard to do. Good luck with getting it off.
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Old 10-01-2008, 08:40 PM   #14
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thanks for all the help!!
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Old 10-01-2008, 09:28 PM   #15
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one more thing is it true that u have to reprogram the new crank sensor to the PCM?
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Old 10-02-2008, 08:46 AM   #16
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no, but make sure the sensor is lined up right with the tone ring.
I find it easier to remove the balancer with am impact gun and air hammer..
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