City Driving: Overdrive or 3rd gear - 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 08-31-2004, 04:52 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2003
Location: Dallas
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
rnbraud is on a distinguished road
Default City Driving: Overdrive or 3rd gear

My 95 SSEi has been getting terrible gas mileage lately. I read one of the posts latetly discussiing Torque Converter lockup. It was mentioned improper lockup will lead to bad gas mileage. It then hit me that I have been getting **** poor gas-mileage since the tranny was rebuilt.

Since I do mainly city driving, is it ok to drive in 3rd instead of overdirive? When I say is it OK I mean will it hurt anything over a long period of time?

Thanks.

P.*. It is a 95 so getting a scantool on it isn't an option.
rnbraud is offline   Reply With Quote
Old 08-31-2004, 05:34 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

There are scantools for the 95. Jrs3800 has one actron so he can tell you what to get if you're intersted.

Under 40 MPH they are the same shifting program. You can push it between them and never notice is. You may need a tune up, or a lighter foot

Hows the ATF look on the dipstick?
BonneMeMN is offline   Reply With Quote
Old 08-31-2004, 05:39 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I have the same Actron. If I had the 16 pin cable, it would read your car just fine.

If you suspect your TC isn't locking up, tell us if your RPM'* drop slightly above 48mph. How many RPM'* do you run at 55mph?

If you don't know how old your O2 sensor is, or if it'* over 50k miles, it might be a good idea to change it anyway. It'* getting tired. Too many factors here. Do you run premium fuel? When was your last tuneup, including plugs and wires? What'* the general condition? Power? Performance?
willwren is offline   Reply With Quote
Old 08-31-2004, 05:44 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2003
Location: Dallas
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
rnbraud is on a distinguished road
Default

Thanks for the response.

I will check the rpms on my way back home and post the results.

I just replaced the ignition module, the plugs, the O2, and the air filter.

The plug wire are about 2 yrs old.

I usually run just regular. But I did try Premium for three weeks and got better results, but not enough to cover the extra cost.

Car runs great and pulls when I get on it.

I have yet to run my can of Sea-Foam yet.

Only thing else is either fuel filter/regulator, or just that the car is old and tired.

Thanks.
rnbraud is offline   Reply With Quote
Old 08-31-2004, 05:49 PM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Those little labels on your car that say "Premium Unleaded Fuel ONLY" aren't just a guide. It'* a requirement. You will damage your engine over time if the timing can't retard enought to prevent knock/detonation.

Your fuel mileage is crappy at least in part because you're running the wrong fuel. Don't EVER run lower than 91 octane except in an absolute emergency.

Run premium for awhile. Your engine is probably all carboned up now. Use some top-end cleaner, run 91 or better, THEN recalculate your mileage.
willwren is offline   Reply With Quote
Old 08-31-2004, 05:58 PM   #6
Senior Member
True Car Nut
 
Join Date: Jun 2002
Location: Bedroom, Ontario
Posts: 3,266
Thanks: 0
Thanked 0 Times in 0 Posts
Drifter420 is on a distinguished road
Default

I usually drive in 3rd in stop and go city driving.. the only time I would shift out of 3rd to OD is when I know I will be able to do 80kmh for a bit.. I find since I"m */C And I stare @ the boost gauge more then the tach that when I"m in city going from 70kmh up.. I tend to have to hit higher boost.. picks up speed slower and heavier on the foot.. thats why I started leaving it in 3rd.. the only thing I don't like bout my car is that there'* no quick reference on the dash like they do on 00+ so you know.. oh crap.. I"m doing 110kmh in 3rd gear.. not good
Drifter420 is offline   Reply With Quote
Old 08-31-2004, 06:11 PM   #7
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Don't consider ANYTHING transmission related until you start running 91 octane every day, and use some form of top-end cleaner to undo the buildup you've got so far.

How long have you been running low-grade?
willwren is offline   Reply With Quote
Old 08-31-2004, 06:31 PM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2003
Location: Dallas
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
rnbraud is on a distinguished road
Default

Willwren: I hear you loud and clear. Just came back from checking my car downstairs, and the Fuel Door has a placard which states to use unleaded fuel only, and "suggests" premium. Tha'* probably why I switched from Premium to Regular way back when.

I will start tonight and see if it improves.

Thanks.
rnbraud is offline   Reply With Quote
Old 08-31-2004, 07:18 PM   #9
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Switching now won't solve your problems. Try some GM top end cleaner. Here'* a link to our first use of it:

http://www.bonnevilleclub.com/forum/...ic.php?t=17556

You probably have alot of buildup in there, and you need to get rid of it.
willwren is offline   Reply With Quote
Old 09-08-2004, 11:49 AM   #10
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2003
Location: Dallas
Posts: 32
Thanks: 0
Thanked 0 Times in 0 Posts
rnbraud is on a distinguished road
Default

Just wanted to update you guys.

I did a SeaFoam cleaning this past weekend. Puffed out some smoke but not a lot. I also just finished my first full tank of Premium unleaded.

I did see a pretty big improvement in driveablility. She now pulls pretty good. Will wait till the third or fourth fillup to see if there is an improvement in mileage.

WIll keep you guys posted and thanks for the help.
rnbraud is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Bonneville: NO reverse, 3rd or overdrive KeithH 1992-1999 0 07-11-2008 11:18 AM
Went to store-had overdrive, coming back-NO OVERDRIVE Hafrod Buick 13 06-01-2006 10:44 PM
FYI if you lose 4th gear / no fourth gear / no 4th gear caminated2k 2000-2005 6 07-24-2005 11:26 PM
City driving SSEi 2000 2000-2005 5 05-17-2004 11:58 AM
overdrive or not to overdrive duffer26 1992-1999 10 03-13-2004 12:09 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 10:33 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.