I recently started getting very low milage in my 1993 Civic EX (1.6 L SOHC VTEC).
Previously I've seen between 32 and 38 (34 AVG.)
Now I'm getting about 25 MPG (it has steadily declined the last three tanks).
Things I have checked/replaced:
- Replaced Plugs and gapped them properly (The old ones looked fine)
- Checked throttle body (no build-up)
- Checked PCV valve: When I squeezed the tube going to the PCV, the idle went up, I guess that means it's open
- Checked EAVC valve: I removed it and examined it, cleaned it and tested it. It checks out, the intake port was a little clogged and it was a little oily inside, but it tests fine (opens with a voltage).
- Timing: It's pretty rock solid, though it's hard to get an actual reading cause the "pointer" or "indicator" is so far away from the pulley with the marks.
- Haven't done a Compression Test yet
- Fuel injectors: I was grabbing them with the engine running and could feel the clicking of the valve in only three of them. I removed the odd one and tested it and it seemed to work fine and fast when supplied with a few volts.
Note: About a thousand miles before the low milage, I jump-started the car and had noticeable engine shake after that. Recently, I replaced one of the motor mounts cause it was busted all the way through. Wierd, but this didn't really help much. It could be just that the new mount isn't as stiff as the old one was, or there are more busted mounts.
So, any ideas about the milage?
Thanks in Advance