Not getting impressive fuel economy with the Civic
I have been experiencing less-than-stellar fuel economy in my Civic VX as of late.
When I first bought it in Feb of 06, I used to get at least 38-40; now I'm lucky to get even 32mpg.
Here's what I've done so far since owning it:
Spark plug wires
Timing belt and water pump
A/C and alternator belt
Distributor cap and rotor
Proper tire pressure on all 4 tires
Oil pan gasket and valve cover gasket replacement
New EGR valve
Adjusted timing to proper setting
Cleaned IACV and FITV
New catalyctic converter
One thing I haven't done yet is fuel system cleaning.
What the hell gives? It barely lasts me 300 miles on a full tank.
Also, the car is bone stock, with the original D15Z1 intact.
its where your front calipers and or wheel cylynders act like your constantly pressing the brake as you drive. go for maybe a 5 minute drive at highway speeds (or close to it) without touching your brakes. pull off the highway on a side street or somehting, get out and touch the rim itself and lugnuts (take off the hubcaps prior) if they burn you that wheels brakes are dragging. if its somewhat warm its normal, but if its liek touching a frying pan its dragging.
it can becaused by several things, siezed calipers (rusted) or if you hit anyhting to cause a crease in a brake line it will allow you to push fluid thru the crease but will have a hard time comming back thru to release that brake. also deteriating rubber caliper brake lines can do this.
My guess is a bad cylinder. I experienced a very loud detonation event going up hill at 75 mph with the VX overloaded with some of my stuff when I moved to Michigan (I know, that was really dumb!!). It was never the same after. Its mpg dropped from 45 to 35 once this happened. You might want to do a compression test on all 4 cylinders.