Pulling Lean help - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-09-2011, 04:29 PM   #1
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default Pulling Lean help

So I'm pulling a lean, misfire code, idling rough, garbage mpg (best right now is 17 on a long highway trip.) Not loosing power or any crusising preformance.
I checked all my vacuum hoses and my and terminals are clean. I check the battery on and off and it'* at 13.7V.
When I unplug my MAF it idles much smoother. I changed the MAF and there is no change in the rough idle. I'm getting 14V at the MAF positive and 5.0V at the MAF Signal.
Sometimes at idle the V'* drop off when I'm sitting at a light.
What else should I be looking for? Thanks
Nighthwk12 is offline   Reply With Quote
Old 02-10-2011, 12:13 AM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Look around for a vacuum leak. Around injectors, gaskets, etc.
Danthurs is offline   Reply With Quote
Old 02-10-2011, 02:35 AM   #3
Senior Member
Certified GM nut
 
SignOfZeta's Avatar
 
Join Date: Mar 2005
Location: New Milford, CT
Posts: 2,284
Thanked 16 Times in 13 Posts
SignOfZeta has a spectacular aura aboutSignOfZeta has a spectacular aura about
Default

I had that problem last summer, too. I replaced the fuel filter and all was well. (Of course, I twisted the fuel line during the repair, but I know you're smart enough to not do that.)

Could also be some bad gas. On the way to the auto parts store for a filter, stop for a fill-up and see if that helps any.
SignOfZeta is offline   Reply With Quote
Old 02-18-2011, 08:50 PM   #4
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default

Just an update. With a nice warm day I went to work. Changed the fuel filter with a nice WIX. cleaned my battery terminals hardcore. Here'* where the tricky part came in. Changed my injectors that I had cleaned and new O-rings. Put everything back together, no dice. I guess the injectors weren't ment for my car. I'm guessing maybe an 00+ L36. Put the original ones back in and she purrs like a lion. No lean code and smooth idle. Can't wait to take her for a spin.
Thanks for all your help again.
Nighthwk12 is offline   Reply With Quote
Old 02-18-2011, 08:53 PM   #5
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Ahh, different injectors. Ya, if the new injectors are a different size, then they will flow at a different rate then the PCM expects.
Danthurs is offline   Reply With Quote
Old 02-18-2011, 08:56 PM   #6
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default

I do have a write up coming though.
Nighthwk12 is offline   Reply With Quote
Old 02-18-2011, 09:08 PM   #7
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Very good, let me know when it'* done.
Danthurs is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Running lean help with diagnostic trigga_b 1992-1999 3 10-07-2007 01:41 PM
"Lean Fuel Bank One - Help!" SOLVED San Juan Cruiser 2000-2005 67 06-08-2006 10:05 AM
Pulling problem. Help AD Bear 2000-2005 4 03-18-2005 11:44 PM
HELP! had the code PO171 show up (fuel system lean bank 1) marksssei 1992-1999 2 07-19-2004 06:38 PM
Something is pulling me to the Dark side, Guys please Help! Bonneville_blue General GM Chat 18 10-05-2002 02:49 PM


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 03:39 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.