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#1
04-13-2007, 10:08 PM
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bad gas mileage
I need some help or suggestions. I have a 2000 Grand Prix 3.8 with 106k, just had the tranny rebuilt with Aamco. Got it back runs great, shifts smooth, but my gas mileage is horrible since it was fixed. Any help or ideas would be greatly appreciated. The only thing I noticed is my RPM's are running slightly higher since the rebuild. Thank
I had a friend take my car for a ride and he seems to think that my issue isn't with the new rebuilt tranny, but rather the torque converter not engaging or disengaging properly. He says that's why my rpm's are higher and my gas mileage is lower. Has anyone else out there having or had the same issue. Please let me know....Thanks Last edited by brookjf; 04-15-2007 at 08:40 PM. 
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#2
04-14-2007, 10:06 AM
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gas is too expensive for this issue!
I need help. My 2000 Pontiac GP 3800 with 106k just had the tranny rebuilt and since I got it back, my gas mileage is horrible. The car runs and shifts great. The only different thing I noticed is the RPM's are slightly higher, and the car feels like it's dragging a little. Pls let me know if you have any ideas...
Last edited by brookjf; 04-14-2007 at 10:42 AM.
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#3
04-14-2007, 10:12 AM
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Re: gas is too expensive for this issue!
It would be helpful to post what model Grand Prix you have since the final drive gearing ratio is different between models.
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#5
04-14-2007, 10:27 AM
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Re: gas is too expensive for this issue!
If one like a 2000 model has the computer reset, would "re-learning" restore things like shift patterns and fuel milage?
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#7
04-14-2007, 12:50 PM
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Re: gas is too expensive for this issue!
I'm curious as to what your gas mileage is. Then we can compare to everyone elses gas mileage....
__________________
 358rwhp/358rwtq with stock LS1 intake A4 3.23 lid, pacesetter lts, ory, 243 heads, SLP LMI, ZO6 cam, BBK SSI intake, 85 mm 
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#8
04-14-2007, 01:28 PM
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Re: gas is too expensive for this issue!
correct me if im wrong......but doesnt the 2000 Pontiac Grand Prix SE only come in a 3.1 V6, not a 3.8?? Cause i have a 2001 Grand Prix SE with the single exahust pipe and the 3.1 V6.
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#9
04-14-2007, 01:48 PM
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Re: gas is too expensive for this issue!
my mileage before the tranny re-build was around 23 mpg for mixed in town/highway. Now I'm only getting 15 mpg . What can I do or should I do to bring me back up to 23?
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#11
04-14-2007, 04:45 PM
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Re: I just don't know what to do???
mabey when they were fooling around in your Engine, something came lose? air ratio is off?? Plugs messed up?? ask the guys at the shop what they did and exaclty what they fooled with on your Car
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2003 Pontiac Grand Prix GT 3800 Series II V6
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#13
04-14-2007, 08:38 PM
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Re: bad gas mileage
This is normal due to the tightness of the new transmission. Give if some miles and see if it improves. I have had two transmissions redone and have had the same results as you are having. The fuel mileage will improve as the transmission breaks in.
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#14
04-14-2007, 08:41 PM
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Re: bad gas mileage
 brookfjk, Just how many threads do you plan on posting concerning the same issue? Please one thread at a time to cut down on confusion and redundant answers. http://www.automotiveforums.com/vbul...d.php?t=693633 http://www.automotiveforums.com/vbul...d.php?t=693717 Thank you for your cooperation. Edit Update: Threads merged together. BE COURTEOUS: AVOID DUPLICATE POSTS Do not post the same discussion more than once on a discussion forum or on many forums. Duplicate discussions can be frustrating for other members, especially for those whose time and energy is limited. Weeding through the same discussion in multiple locations can be not only frustrating, but down right annoying. Duplicate discussions will be deleted. Reposting the same message repeatedly can be interpreted as SPAM and could result in the loss of your membership. Also be conscious of your fellow members and avoid making meaningless posts for the sole purpose of increasing your post count.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines Last edited by BNaylor; 04-14-2007 at 09:24 PM.
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#15
04-18-2007, 02:17 PM
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Re: bad gas mileage
If your RPMs are higher something is not right. Take it back to the shop if your RPMs are just a little higher its probably the TC not locking up. With a scanner they can tell you. Try pulling up on the brake pedel with your foot while driving at a steady speed above 50 and see if it locks up.
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