still havin por milege - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-07-2007, 12:34 AM   #1
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okay so i gave my 90 sse an oil change new fuel filter new oil filter new gas filter new cat and new axhaust wich still has a tiny hole up front so i can hear it a little bit other wise its to quiet i get pretty bad mileage ive been messin with my tv cable and still cant get her to do 2oo rpms at 60 would like to try and get it to do like 18-19 at 60 my tps was set at .43 but i was thinkin that would have made the computer give it more gas so i turned it down a bit now it seems worse please if any one has any tips on this please post
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Old 08-07-2007, 02:08 AM   #2
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Well, the first thing that jumps out at me is that you seem to think that adjusting your TV cable will somehow change your final drive ratio. You only change your shift points by adjusting that, not your cruising RPM. The gears determine that.

Or maybe I misunderstood your question there...

Actually, no. The first thing that jumped out at me was the complete lack of periods, commas, capitalization, or other helpful punctuation in your post. Made it a bit hard do read.

If you could improve on that, that would be great, for the future. You'll make it easier for us to help you...

Looks like you have a decent start on doing a tuneup on your car, which is a good start to upping your mileage. I'd suggest a couple of things that you didn't mention:

- Spark plugs, if they're old, or if they're Bosch Platinums.
- Oxygen sensor, if it'* really old, or if it'* a Bosch.
- Maybe spark plug wires, if they are original, or extremely cheap replacenemts.
- Maybe clean the TB.

Also make sure that your torque converter is locking up when it should be. Your slight exhaust leak will come in handy here, since you can hear the engine RPMs (unless you have a tach, which it sounds like you might).

Just how bad is your mileage, anyway? What kind of driving?
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Old 08-08-2007, 10:29 AM   #3
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When was you last major tune up, filters, plugs etc.
Some Other things that kill mpg are bad wheel alignments , and front calipers that are sticking. Tire pressure should be looked at as well as adding a bottle of fuel injection cleaner.
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Old 08-08-2007, 09:32 PM   #4
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tune up on all that is good. alignment needs done and yes my brakes are sticking. i managed to get them lose for a couple of miles but that was about it.
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Old 08-08-2007, 09:54 PM   #5
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Ok, lets go over a VERY clear checklist here just to confirm.

Plugs (Delco, NGK or Autolite) -
Wires (Delco, Napa Belden, or Autolite Pro) -
Clean MAF sensor element -
o2 sensor (last 30k miles/Delco or Denso) -
Tire pressure -
Uneven Alignment -
Dragging Brakes -
Air Filter (Purolator or K&N) -
Excessive jackrabbit starts from stop -
Excessive cargo load in vehicle -
Excessive carbon build up in cylinders (use seafoam) -

etc. not sure if i forgot anything
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Old 08-08-2007, 10:05 PM   #6
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What'* the story with the brakes?
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Old 08-08-2007, 10:09 PM   #7
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Sounds like he'* referring to a binding caliper.

Take off your calipers, compress the pistons, regrease the slider pins really well and then reinstall, check for mobility on the pins by sliding back and forth. if the piston wont compress, replace the caliper.
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Old 08-08-2007, 10:56 PM   #8
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okay well how do i go about getting another security bolt for my lugs. my loving mother decided she was goin to through it out one night. now as for the rest

plugs(autolite)
wires(autolite pro)
yes maf is cleam
delco 02 sensor
tire pressure pretty good most of the time
yes uneven alignment
yes draging brakes
air filteer ffram
last three - no as i only get 9 gallons every week and it only last 150-190 max acordin to my trip
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Old 08-09-2007, 12:22 AM   #9
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ok, fix those brakes and alignment and you should be much better.

my car averages 26.5 mpg currently, but when my brakes were dragging, i averaged 11mpg. scary decrease with those bad brakes.
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Old 08-09-2007, 03:17 AM   #10
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Yeah, between the dragging brakes and the alignment that might be off, it'* no mystery that the mileage hasn't been good. Especially the brakes.

Probably just some dry slides. Fixing those should help a ton.
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