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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 12-10-2004, 12:08 AM   #1
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Default low rpm vibrations bad gas mileage

it is a 93 ssei 140000 miles. it started to vibrate when it is idling and at low rpm. it has less power and bad gas mileage. puts out a 31,54,and 55 code untill i reset the ecm now it is a 54. the codes i got from this site has no 54 code on the list. what may be the problem? any help would be appreciated.
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Old 12-10-2004, 12:15 AM   #2
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31 is your P/N switch. It'* not the problem. Nor will it affect how the car runs. 54 is EGR solonoid #2. A thorough cleaning of the EGR valve should fix this (you have the digital EGR, and many of us have seen this, cleaned the valve shafts and return springs, and fixed it).

55 concerns me. That'* a general PCM fault. Try disconnecting your battery for 30 minutes, and re-seat all your PCM connectors (PCM is above the RF passenger footwell). See if the 55 comes back.

Where are you located? Can you put your location in your profile, and put "93 SSEi" in your signature? Both of these will help us to help you.
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Old 12-10-2004, 12:59 AM   #3
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i think the 55 was from when i plugged the key into the wrong spot on the plug in. i'll try cleaning the egr and posting my info. thanks for the help.
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Old 12-11-2004, 12:40 AM   #4
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tried to clean up egr but the small screws broke off just like i thoughed they would. tried to drill them out and retap but couldn't go through screws. needless to say i need a new base for the egr. is there a rebuild kit fir it? is there any way i can get around the $200 charge other then junk yards?
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