******10 MPG caused by what? Update******** - 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.

Closed Thread
 
 
 
Thread Tools Search this Thread
Old 04-09-2007, 12:07 AM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: May 2006
Location: Chicago, IL
Posts: 496
Thanks: 0
Thanked 0 Times in 0 Posts
trigga_b is on a distinguished road
Default ******10 MPG caused by what? Update********

I've gotten my exhaust done and a full tune-up except an oil change. When this was first done I got a good est. 25 mpg in the city. After that ran out its back to the same problem whcih is like 13-15 mpg. My only suggestion could be my air intake which is not a K&N, its some bootleg **** and I do have a heat shield made out of 3 layers of that bubble wrap. Could anyone help me with this?
trigga_b is offline  
Old 04-09-2007, 12:09 AM   #2
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

what'* your LTFT? what'* the O2 saying?
Damemorder is offline  
Old 04-09-2007, 03:55 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: May 2006
Location: Chicago, IL
Posts: 496
Thanks: 0
Thanked 0 Times in 0 Posts
trigga_b is on a distinguished road
Default

what is LTFT? I changed my 02 sensor too.
trigga_b is offline  
Old 04-09-2007, 09:00 PM   #4
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

You changed the O2 during the tuneup, So it'* probably vacuum related.
Damemorder is offline  
Old 04-09-2007, 09:05 PM   #5
PopaDopaDo
True Car Nut
 
popatim's Avatar
 
Join Date: Jan 2005
Location: NY
Posts: 4,957
Thanks: 0
Thanked 0 Times in 0 Posts
popatim is on a distinguished road
Default

Am I the only one that thinks getting 25mpg in city driving is impressive?
popatim is offline  
Old 04-10-2007, 02:22 AM   #6
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: May 2006
Location: Chicago, IL
Posts: 496
Thanks: 0
Thanked 0 Times in 0 Posts
trigga_b is on a distinguished road
Default

yeah I did try to change the rubber vacum fittings because they were craking and its hard to them on and I didn't put the new ones on all the way. Is there a trick to getting these on?
trigga_b is offline  
Old 04-10-2007, 02:24 AM   #7
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

push and turn.

Push then offest and rotate, keeping the same offset. Like you're cranking on a handle.
Damemorder is offline  
Old 04-11-2007, 01:01 AM   #8
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: May 2006
Location: Chicago, IL
Posts: 496
Thanks: 0
Thanked 0 Times in 0 Posts
trigga_b is on a distinguished road
Default

isn't there a different size that goes from the FPR to the vacum blcok thing? because the FPR stem is skinnier than the other stems and thats the one thats kind of loose. I used 1/4 rubber fittings for the other three is this correct?
trigga_b is offline  
Old 04-12-2007, 03:41 PM   #9
Senior Member
Posts like a Northstar
 
Join Date: Dec 2005
Location: Indianapolis
Posts: 560
Thanks: 0
Thanked 0 Times in 0 Posts
impatient99 is on a distinguished road
Default

Quote:
Originally Posted by popatim
Am I the only one that thinks getting 25mpg in city driving is impressive?
With a 3.8 yes it is good.
Even for highway mileage it is not "real" bad.
impatient99 is offline  
Old 04-24-2007, 02:39 AM   #10
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: May 2006
Location: Chicago, IL
Posts: 496
Thanks: 0
Thanked 0 Times in 0 Posts
trigga_b is on a distinguished road
Default

I changed the rubber fittings correctly and I'm still getting poor mileage . Could there be anything else mechanically wrong related?
trigga_b is offline  
 
 
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
The MPG Post to end all MPG Posts mkaake 1992-1999 24 05-05-2005 03:25 AM
WTF LEAK CAUSED THIS! Rosco the Iroc 2000-2005 15 08-04-2004 10:29 AM
Fuel Gauge Problems Caused by Shell(and other) Gasoline Ol' Timer Everything Electrical & Electronic 9 06-29-2004 06:42 PM
Fuel Gauge problems caused by bad gasoline... mdjones333 General GM Chat 9 06-24-2004 08:10 AM
Is this problem caused by my computer? junkman 1987-1991 5 04-08-2003 10:45 AM


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 09:40 AM.


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.