BHOLD6160
New Member
I just bought a 99 civic ex. All stock. 144k. This is my second civic, my first was a 96 ex, both have D16Y8 and my first one when driving about 115 miles (a trip I make frequently) would use just under a quarter tank. Now the 96 had eBay brand intake and exhaust and was sitting on coil sleeves. My 99 uses way over a quarter tank but not quite a half. In the past week I have changed the spark plugs and plug wires, replaced fuel filter, cleaned throttle body, air filter, oil and filter using 5w 30 and cleaned out my throttle body. What else can I do to correct this? And what could be causing it. Another thing to point out, when I press on the gas the fuel gauge will drop up to over quarter tank less and then come back up as I stay at a steady rev. Obviously I know gas gauges fluctuate but I have never seen it fluctuate this much. Thanks for any help. Cheers.