I recently started getting very low milage in my 1993 Civic EX (1.6 L
Previously I've seen between 32 and 38 (34 AVG.)
Now I'm getting about 25 MPG (it has steadily declined the last three
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.
The air filter is super clean
*Oil + Filter was replaced recently (1500 miles)
Performance seems top-notch, as fast as ever.
*Valves: I just adjusted them and they weren't hardly off at all, only
the valves on one cylinder were .001" too tight.
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
So, any ideas about the milage?
Thanks in Advance