Is my car MPG too low? - 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.

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Old 05-20-2004, 02:36 PM   #1
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Default Is my car MPG too low?

94 SE only 15-17 MPG.

Is this normal or too bad?

I feel my car lost some power after I changed sparks, because I felt the accelabrate from stop is some bad than before. Is there any way to check if I installed all sparks right?

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Old 05-20-2004, 02:38 PM   #2
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Are you getting a check engine light? What brand of plugs did you buy? You could hook up a timing light to each spark plug wire to ensure that you don't have a wire issue and/or that the plug wire is firmly seated on the plugs.
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Old 05-20-2004, 02:48 PM   #3
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i'd say replace your O2 sensor

im only getting 250-260 a tank and i normally get about 290-310
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Old 05-20-2004, 02:55 PM   #4
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Sounds like its time for agood old tune up. Spark plugs, wires, air filter, fuel filter, pcv valve, 02 sensor, change em all, you will see a diffrence there. I get about 19.
Dont use Bosch!
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Old 05-20-2004, 03:14 PM   #5
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I would say that is way low for mileage. My 94 SE gets 27MPG regularly. Right around 400 miles every tankful.
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Old 05-20-2004, 04:46 PM   #6
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Default I replaced with Bosch.

Quote:
Originally Posted by SSEimatt93
Sounds like its time for agood old tune up. Spark plugs, wires, air filter, fuel filter, pcv valve, 02 sensor, change em all, you will see a diffrence there. I get about 19.
Dont use Bosch!
Damn it, I did bought the Bosch. Is this very bad choice? What kind band is better?
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Old 05-20-2004, 05:06 PM   #7
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I have Bosch wires in my 93 and Bosch plugs and wires in my 99 and never had an issue with either car. Many on this site don't care for Bosch, however, I've personally never had an issue in the 30,000 miles I've been using Bosch parts. Most will recommend AC Delco for the 3800.

Even using Bosch parts, I still get about 400 miles per tank out of each car and have noticed no power loss.
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Old 05-20-2004, 11:06 PM   #8
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My 3800 killed a set of Bosch plugs, and good ones too, paid 6 sumthin a peice, unfortunatly I had changed the spark plugs day the after I bought the car, May 10th 2003, and if you look on my sign up date it says May 11th 2003. About 7 months ago I removed the bosch and tossed stock AC Delcos in there.
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Old 05-20-2004, 11:09 PM   #9
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Could a colder plug (1 range) help with milage at all? I'll drop down atleast one when i get my hot cam / rebuild, but if it can help... What about with an engine in tip top shape, with a CAI (boxed and all), what are the milage/performance gains?
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Old 05-21-2004, 09:56 AM   #10
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Unless you are accelerating hard routinely, 16 mpg is really low for these cars. My '92 SSEi did 24.6 mpg on the last fillup and it has 124K mi on it. I'm using 93 octane premium which costs me $2.04 here in Ames. I don't often stick my foot into it. 2/3 highway -1/3 city miles. The car has no mods.
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