This is kind of a re=hash of another post I made, but with new updated info. Looking for some feedback please.
I bought a 2004 Honda Civic LX 1.7L about a year ago. It had 118k miles when I bought it, but now it has about 124k.
Once the car starts the idle sits about 1.5k rpm, once it warns up it drops to about 600-700rpm. As the rpm drop from 1.5k to 700rpm the vibration gets significantly worse. I am trying to find out what is causing the vibration at idle and prevent it.
Here are things that have been done to the car so far that I know of [I bought the car at 118k]: 1)
I have replaced the 3 motor mounts with ones from Auto Zone [Don't know brand, was generic]. (When I first bought it) 2)
I replaced the exhaust to a fairly stock one (Which I wonder why? Did it add performance?) 3)
It has a AMF cold air intake, that goes to the bottom of the car 4)
I Replaced the spark plugs a year ago (When I first got it) 5)
I just recently did a piston compression test and found the cylinders to be:
Cylinder 1: 185 PSI (1275 KPA)
Cylinder 2: 185.5 PSI (1280 KPA)
Cylinder 3: 190.5 PSI (1310 KPA)
Cylinder 4: 200.5 PSI (1380 KPA)
The Honda Mechanics Manual says each cylinder should be between 10% of each other, which these meet the criteria. 6)
I checked the timing with a timing light AND a OBDII computer reader to check the timing that both confirms it is in the range of 6-10 degrees, which according to the Mechanics manual for the 2004 Civic its 8 degrees + or - 2 degrees, so that seems ok. Here is a dumb video I made, but it will show the engine:
[YOUTUBE]http://www.youtube.com/watch?v=7TsNsX3Mzak[/YOUTUBE] Here is an example of the vibration:
There has to be something I'm missing. Does anyone have some insight?
-Whats A Civic