Poor gas mileage
08-02-2003, 02:21 AM
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Poor gas mileage
I am Filling my tank up from E about once a week after ive drove 300 town kilometers or in miles about 180. What could be causing this poor mileage....ps its a SSEi as well but still thats not good at all....i replaced the O2 sensor and the mileage got a bit better...
08-03-2003, 01:19 AM
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The best i can do here for octane is 91 and im using it. The spark plugs and wires are new, and yes it seems to run a bit rough at idel, and when its in park if i rev it up to about 2800 rpm or more it starts missing and backfiring.
08-03-2003, 01:34 AM
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Yeah injectors might be dirty or bad might try some of that injector cleaning additive. But I noticed that right after I got a new battery for my car that I got a lot of misfires at about 3000rpm then the next day the misfires were gone, I still replaced my plugs.
08-03-2003, 01:54 AM
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Oh yeah....guess I wasn't out in left field. Could actually be the injectors. I forgot....a long time ago when I was only getting like 220 miles a tank at most...I bought some STP Complete Fuel System Cleaner (gray bottle) and poured that stuff in the gas tank.
WOW!!!! I got >40 more miles to the tank! From 220/tank max to about 270/tank. You use it every 4,000 miles. That may work for you, especially since your wires/plugs aren't bad.
The second time I used it though I noticed a big drop in mileage for some reason, and it was over 4,000 miles later. I was worried, but changed my O2 sensor, PCV, and fuel filter and it was MUCH better.
I now get about 310/tank with a lot of city miles...and 390 highway (with some hard bursts to 105mph though).
WOW!!!! I got >40 more miles to the tank! From 220/tank max to about 270/tank. You use it every 4,000 miles. That may work for you, especially since your wires/plugs aren't bad.
The second time I used it though I noticed a big drop in mileage for some reason, and it was over 4,000 miles later. I was worried, but changed my O2 sensor, PCV, and fuel filter and it was MUCH better.
I now get about 310/tank with a lot of city miles...and 390 highway (with some hard bursts to 105mph though).
08-03-2003, 02:20 AM
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Originally Posted by bonnie94sse
WOW!!!! I got >40 more miles to the tank! From 220/tank max to about 270/tank.~~~
I now get about 310/tank with a lot of city miles...and 390 highway (with some hard bursts to 105mph though).
I now get about 310/tank with a lot of city miles...and 390 highway (with some hard bursts to 105mph though).
I was getting between 320mi and 350mi/tank before I started any replacing/cleaning/modding and thats on an even mix of city and highway driving.
Originally Posted by Allmachtige
Could be something as simple as dirty air filter.