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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 08-30-2005, 10:32 AM   #11
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Quote:
Originally Posted by rjolly87
Quote:
Originally Posted by jr's3800
Ever had any MAF issues on that 87? I know they were very fruity about the MAF in 87-88 LG3... I have a friend that has been through several on his 3.0 LN7...

Not sure what the problem may be at this point..
wouldnt that cause different symptoms?
Not always... I have seen them do some pretty funky things... Usually if the MAF is crapping out it will have a code 34, It can cause all sorts of issues...

It could be any number of things causing his low MPG'*... Its hard to say what the issues may be...

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Old 08-30-2005, 11:07 AM   #12
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My 1989 sse is consistently averaging 19-20 mpg since I have owned it for a year.Bought the car after my fiancee recommended it and after doing research on vehicles.The many happy customer reviews that I came across in my research made me consider a Bonneville (87-91).Since owning it for a year I am now in the list of happy Bonneville customers.The car was bought for $750 and I put in $950 since owning it.I am amazed on how smooth and effortless the highway drive is.I love the car and would recommend it to all.The 3800 series 1 is on the Wards Top Ten List for best engines this century.It has good pick up and is durable.The sse has ground effects and is cool lookin.Long May the Bonneville Run.
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Old 08-30-2005, 11:13 AM   #13
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Default Re: gas mileage

Quote:
Originally Posted by player9497
My 1989 sse is consistently averaging 19-20 mpg since I have owned it for a year.Bought the car after my fiancee recommended it and after doing research on vehicles.The many happy customer reviews that I came across in my research made me consider a Bonneville (87-91).Since owning it for a year I am now in the list of happy Bonneville customers.The car was bought for $750 and I put in $950 since owning it.I am amazed on how smooth and effortless the highway drive is.I love the car and would recommend it to all.The 3800 series 1 is on the Wards Top Ten List for best engines this century.It has good pick up and is durable.The sse has ground effects and is cool lookin.Long May the Bonneville Run.

you musta got one of the good ones.

btw, is the offending vehicle throwing any codes?
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Old 08-30-2005, 11:36 AM   #14
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Default Re: gas mileage

Quote:
Originally Posted by rjolly87
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Originally Posted by player9497
My 1989 sse is consistently averaging 19-20 mpg since I have owned it for a year.Bought the car after my fiancee recommended it and after doing research on vehicles.The many happy customer reviews that I came across in my research made me consider a Bonneville (87-91).Since owning it for a year I am now in the list of happy Bonneville customers.The car was bought for $750 and I put in $950 since owning it.I am amazed on how smooth and effortless the highway drive is.I love the car and would recommend it to all.The 3800 series 1 is on the Wards Top Ten List for best engines this century.It has good pick up and is durable.The sse has ground effects and is cool lookin.Long May the Bonneville Run.

you musta got one of the good ones.

btw, is the offending vehicle throwing any codes?
The offending vehicle has yet to get a calculated mileage and may not be offensive.
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Old 08-30-2005, 12:09 PM   #15
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The only code i ever get is for an EGR problem, code 32. But i've checked and cleaned every part of the EGR system and everything seems to be in good working order so i don't know what the problem could be. The valve moves freely, the vacuum line is in good condition, and the soleniod works as it should.
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Old 08-30-2005, 12:12 PM   #16
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Quote:
Originally Posted by sse1990
The other thing to remember, if anyone else has noticed, that when you fill it up, you get more mileage from full to half, then from half to empty.

It is just as easy to top it up from 3/4 to full than from empty to 1/4 tank. Plus it is better to keep it full, since that is what cools your fuel pump.
This is very true, when I fill up the guage goes well over full. It takes forever to go down to 1/2, but 1/2 to empty is very quick. My bonne does 17-18 MPG all city driving.
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Old 08-30-2005, 01:00 PM   #17
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My '91 SSE is stock and it has been getting 16mpg (combined) for several years. I can get it up to 20mpg with mostly highway driving and a light foot at the stoplights.
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Old 08-30-2005, 04:13 PM   #18
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Alec, aren't you the one who has that walker O2 sensor? Maybe that'* the cause for the poor fuel economy? Please eliminate any confusion here, for myself. If the ignition is weak, does the O2 sensor see that as a rich or lean condition? I always thought the O2 sensor saw that as a lean condition, and thus threw more fuel in. But that doesn't make a whole lot of sense.

Also, a gutted airbox doesn't necessarily mean a good flowing induction system. Do you have a new air filter in there?

I believe the PCV Valve can cause poor fuel economy, but I am not 100% sure. Just pull your'* out and shake it. If it rattles, it'* not an issue. The other test, is to pull the oil fill cap, and if it has a vacuum on it [possibly so much you can't even remove the cap] then it is also not functioning properly. If you do get the cap off, it'* possible you could stall the engine due to the major crankcase pressure change.

It could also be a vacuum leak.. or the fact your EGR valve isn't operating properly, or the ECU isn't seeing it'* proper use.

I will also agree with the fellow members, in that you should get your mileage tested via the wonderful testing, minus the fuel gauge. Hit me up on AIM tonight.. I have a few suggestions for you.
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Old 08-30-2005, 09:41 PM   #19
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Yea i'm the one with the walker O2 sensor. My mileage improved after putting that in. All my plugs are very clean so it'* not running rich (i don't think). It does smell rich out of the exhaust though but that could be the no Cat. thing. I'm not going to buy a new air filter for it until i just go all out and get the CAI so if that'* it well then that'* it. But i am going to start running E85 fuel in it. At $2.89 a gallon as of today, i can't afford regular anymore. Nice thing living in minnesota, we have LOTS of corn to burn. Lol
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Old 08-30-2005, 10:17 PM   #20
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The alcohol in fuel may be attractive price wise but has less energy content. Interesting to see if the cheaper price will cover for less mileage? Weird that you should mention this since there was just an article in the local paper about ways to get the best mileage. #3 on the list was don't use alcohol blended fuel. Strange to see in a time when we need to stretch the available petroleum, and the alky helps that maybe, but on a personal note, it may cost you more? Alky does suppress knock better.
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