3800 Series II Lean code - 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.

Thread Tools Search this Thread
Old 03-12-2009, 06:56 PM   #1
Junior Member
Thread Starter
Join Date: Mar 2009
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
indyeberwines is on a distinguished road
Default 3800 Series II Lean code

I just bought a '98 Bonne SE with the 3800 Series II engine. New serpentine belt, tension pulley and water pump. The Check Engine light came on and I assumed it was an O2 sensor since it is still running smoothly. I also have what sounds like a rubbing or whirring noise coming from the belt-side of the engine. After a quick check, a mechanic says that the there is a "lean" code and an O2 sensor code, although I didn't get the code numbers. He also says the noise is actually a vacuum leak, but he didn't have time to dig into the source of the leak yet.

Does anyone have any experiences on what may be the source of the leak before we tear the engine down to find it?

indyeberwines is offline   Reply With Quote
Old 03-12-2009, 07:07 PM   #2
Senior Member
True Car Nut
Purplehazeir's Avatar
Join Date: Sep 2008
Location: Arlington, WA
Posts: 7,979
Thanks: 0
Thanked 1 Time in 1 Post
Purplehazeir is on a distinguished road

Check all your vacuum lines for cracks, wear or deterioration. One way to find the source of the leak includes spraying carb cleaner near a suspected vacuum line problem. If the engine rev'* when you spray it, that would be the source of your leak. Chasing down a vacuum leaks does not mean tearing down the engine yet...you just need to put some time into it.
Purplehazeir is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
1991 SSE - code 28 code 39 code 42 - losing sleep labonnita 1987-1991 9 12-26-2009 10:58 PM
Check Engine Light and Lean Mixture Code crod101 1992-1999 3 01-28-2008 11:18 AM
3800 SUPERCHARGED vs, 3800 SERIES 2 ColorMeBadd2 Performance, Brainstorming & Tuning 3 11-19-2006 02:48 AM
HELP! had the code PO171 show up (fuel system lean bank 1) marksssei 1992-1999 2 07-19-2004 06:38 PM

3800 series ii lean code

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 07:18 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.