BN Posted September 16, 2009 Report Share Posted September 16, 2009 I just checked mpg on my Cutlass and with no highway driving it ended up being 13.3 mpg. This seems terrible to me. What are you guys getting? Any ideas on what to look for if this is low? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted September 16, 2009 Report Share Posted September 16, 2009 don't rev so high? that doesn't seem too far from normal for hard city driving... but, does your check engine light work? is it on? what have you done for tune-ups and stuff??? Quote Link to comment Share on other sites More sharing options...
hotrodolds Posted September 16, 2009 Report Share Posted September 16, 2009 Yeah...tune-up time. Should be upwards of 17mpg or so, really. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 16, 2009 Report Share Posted September 16, 2009 Yeah...tune-up time. Should be upwards of 17mpg or so, really. For a 4000lb car with a 3.4L DOHC? I can see how a normal w-body would get that mileage, but that added weight can't be good for fuel economy. Do you have aftermarket wheels on it? Quote Link to comment Share on other sites More sharing options...
BN Posted September 16, 2009 Author Report Share Posted September 16, 2009 Original wheels. Service engine light works. Comes on for a few seconds here and there but never stays on for long. I'm used to old cars with V-8's and carbs. What is considered a tune up on these? New plugs, airfilter, wires,???? Anything else? Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 16, 2009 Report Share Posted September 16, 2009 Original wheels. Service engine light works. Comes on for a few seconds here and there but never stays on for long. I'm used to old cars with V-8's and carbs. What is considered a tune up on these? New plugs, airfilter, wires,???? Anything else? Don't forget the oxygen sensor. A bad oxygen sensor will screw up your fuel economy pretty badly as well. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted September 16, 2009 Report Share Posted September 16, 2009 pcv as well. need to see why the SES light comes on though... if its only for a few seconds, it could be EGR. that can kill some fuel economy. might want to run some seafoam through it as well... Quote Link to comment Share on other sites More sharing options...
jake91 Posted September 16, 2009 Report Share Posted September 16, 2009 full city driving and revs to 4+k at every light results in 17mpg for me Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 16, 2009 Report Share Posted September 16, 2009 pcv as well. need to see why the SES light comes on though... if its only for a few seconds, it could be EGR. that can kill some fuel economy. might want to run some seafoam through it as well... x2 on the seafoam suggestion. Quote Link to comment Share on other sites More sharing options...
hotrodolds Posted September 16, 2009 Report Share Posted September 16, 2009 Agreed here as well. Quote Link to comment Share on other sites More sharing options...
BN Posted September 16, 2009 Author Report Share Posted September 16, 2009 What's Seafoam? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted September 16, 2009 Report Share Posted September 16, 2009 do a code check procedure. paperclip check will work for a 93. you need to see what your codes are. seafoam. go to wal-mart or an autoparts store. it is a can of multi-purpose engine cleaner. you would allow seafoam into the engine through a vaccum line and it will help remove gunk in the engine... http://www.seafoamsales.com/motor-treatment/index.html Quote Link to comment Share on other sites More sharing options...
BN Posted September 18, 2009 Author Report Share Posted September 18, 2009 Got some Seafoam. Any suggestions on the best way to get into engine? Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted September 18, 2009 Report Share Posted September 18, 2009 Got some Seafoam. Any suggestions on the best way to get into engine? Brake booster line. Its a big, thick vacuum hose going into your brake booster, a large usually black cylinder type thing on the driver's side. Just unplug that from the brake booster. Your engine will idle rough and might die. Turn it back on, and start pouring it in there. Once done, plug it back in, sit back 5-10 minutes, and start it up again. Be advised, your car will smoke up a LOT out of the exhaust. Its completely normal, but you probably shouldn't be inside a garage or in a busy intersection doing that. There are lots of youtube videos about this. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted September 18, 2009 Report Share Posted September 18, 2009 Brake booster line. Its a big, thick vacuum hose going into your brake booster, a large usually black cylinder type thing on the driver's side. Just unplug that from the brake booster. Your engine will idle rough and might die. Turn it back on, and start pouring it in there. Once done, plug it back in, sit back 5-10 minutes, and start it up again. Be advised, your car will smoke up a LOT out of the exhaust. Its completely normal, but you probably shouldn't be inside a garage or in a busy intersection doing that. There are lots of youtube videos about this. should also add not to pour it too fast or you can hydrolock the motor... and don't leave it sit too long or else you can foul the spark plugs... i've also done this with the winter formula windshield washer fluid, seems to accomplish the same thing but requires a larger amount of fluid... Quote Link to comment Share on other sites More sharing options...
BN Posted September 23, 2009 Author Report Share Posted September 23, 2009 Did the Seafoam. Car runs smoother, just need to check mpg to see if any improvement. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted September 23, 2009 Report Share Posted September 23, 2009 how about that check engine light? Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted September 23, 2009 Report Share Posted September 23, 2009 I get 15mpg around town in my truck. you should deff be getting better than me. Quote Link to comment Share on other sites More sharing options...
BN Posted September 25, 2009 Author Report Share Posted September 25, 2009 Didn't get to the check engine light yet but mpg is 17 after the Seafoam. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted September 25, 2009 Report Share Posted September 25, 2009 READ: http://www.extreme-check-engine-light-codes.com/GM%20OBD1%20Decoder.htm and a paperclip will work for a jumper wire. each code is repeated 3 times, then the next code, and then the code loop will start over. You will always get a code 12 before other codes. Quote Link to comment Share on other sites More sharing options...
94 olds vert Posted October 1, 2009 Report Share Posted October 1, 2009 I recently got 14.7 mpg in the city in my cutlass. All city driving. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted October 1, 2009 Report Share Posted October 1, 2009 I recently got 14.7 mpg in the city in my cutlass. All city driving. Then there's definitely something wrong with your car. Quote Link to comment Share on other sites More sharing options...
jake91 Posted October 2, 2009 Report Share Posted October 2, 2009 Yeah...tune-up time. Should be upwards of 17mpg or so, really. For a 4000lb car with a 3.4L DOHC? I can see how a normal w-body would get that mileage, but that added weight can't be good for fuel economy. Do you have aftermarket wheels on it? I recently got 14.7 mpg in the city in my cutlass. All city driving. Then there's definitely something wrong with your car. Very contridicting statements LOL Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted October 2, 2009 Report Share Posted October 2, 2009 the vert would obviously get worse gas mileage, but I then realized that 14mpg really is pretty bad. Quote Link to comment Share on other sites More sharing options...
Fmr12B Posted October 6, 2009 Report Share Posted October 6, 2009 The 3.4L Cutlass Vert's are rated at 15mpg city per the EPA's website. With lots of stop & go traffic, and short trips, I average about 15mpg. Quote Link to comment Share on other sites More sharing options...
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