crappy mpg's, please help!!!...
#1
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crappy mpg's, please help!!!...
Alright, just like the title states I'm getting crappy mpg's out of my 99 gxe. When I bought the car it had 200k and ac worked and I was pulling 25-26mpg or about 470+ on a full tank. I drive like a grandma so having a lead foot isn't likely. Now I get about 19-21mpg or about 380 miles on a full tank with out ac (bypassed ac compressor with smaller belt) and I still drive like a grandma Here are the specifics and things I've done; its auto and it has 252k miles, I've change the plugs, vc baskets and cleaned out the egr valve all within at 250k. Also my cel is on (its been on since I bought the car), now the read on the cel is for an o2 sensor that's been missing since before I got the car (and I know that's not the reason why I'm getting crappy mileage) also I've changed the coil pack on the 5th cylinder due to it miss firing and it also caused a reading ln my cel before I've changed it. Here is the the story on that, I changed the coil pack and it stopped miss firing. I cleared the reading with an obd reader and my car started miss firing again BUT when the cel came back on the car stopped miss firing. The cel now reads that the 5th cylinder is miss firing when its actually isn't. Is this the reason why I'm getting crappy ac? I don't want to reset the cel and the car starts miss firing again and then the light comes on again then the car runs fine.
Any advice on how to solve this problem will be greatly appreciated...
Any advice on how to solve this problem will be greatly appreciated...
#2
Alright, just like the title states I'm getting crappy mpg's out of my 99 gxe. When I bought the car it had 200k and ac worked and I was pulling 25-26mpg or about 470+ on a full tank. I drive like a grandma so having a lead foot isn't likely. Now I get about 19-21mpg or about 380 miles on a full tank with out ac (bypassed ac compressor with smaller belt) and I still drive like a grandma Here are the specifics and things I've done; its auto and it has 252k miles, I've change the plugs, vc baskets and cleaned out the egr valve all within at 250k. Also my cel is on (its been on since I bought the car), now the read on the cel is for an o2 sensor that's been missing since before I got the car (and I know that's not the reason why I'm getting crappy mileage) also I've changed the coil pack on the 5th cylinder due to it miss firing and it also caused a reading ln my cel before I've changed it. Here is the the story on that, I changed the coil pack and it stopped miss firing. I cleared the reading with an obd reader and my car started miss firing again BUT when the cel came back on the car stopped miss firing. The cel now reads that the 5th cylinder is miss firing when its actually isn't. Is this the reason why I'm getting crappy ac? I don't want to reset the cel and the car starts miss firing again and then the light comes on again then the car runs fine.
Any advice on how to solve this problem will be greatly appreciated...
Any advice on how to solve this problem will be greatly appreciated...
#4
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Location: San Antonio, TeXas
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Yes it is the rear o2 sensor, and like I said that light has been on since i got the car and pulled still 25-26 mpg with the ac on. I changed the coil pack that needed changing but only miss fires when I reset the cel/ turn it off. After it turns back on the car runs normal but I still get 21 mpg max. I assume it still reads the miss fire on the cel and that's why I get the crappy mileage but how do I fix that if its not actually miss firing?...
#5
Yes it is the rear o2 sensor, and like I said that light has been on since i got the car and pulled still 25-26 mpg with the ac on. I changed the coil pack that needed changing but only miss fires when I reset the cel/ turn it off. After it turns back on the car runs normal but I still get 21 mpg max. I assume it still reads the miss fire on the cel and that's why I get the crappy mileage but how do I fix that if its not actually miss firing?...
#8
I too had the CEL on and was getting poor gas mileage of about 21mpg. Based on recommendations in the forum, I changed all 3 right bank coil packs, and both front O2 sensors and then reset the CEL on my 1999 SE 5-Speed....Now the car is super strong again and gas mileage is back up to 26mpg!!!!!!
Last edited by Kenneth Joseph; 04-19-2011 at 05:29 AM.
#10
Dude, Its a Maxima your fuel economy will always suck.
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