First off, I want to let you all know that the car was running with a half-dead cylinder to begin with. However, it was driving decently. Removal of the plug wire on #2 made the engine idle even rougher, so it was left plugged in.
This is my brother's car and he said that he'd been driving with the engine light on for a few months. Derp. The codes show misfires on all cylinders (P0301-P0304)and random misfires (P0300). The dead cylinder is #2 and a dry compression test showed 26 psi and the wet showed 30 psi. All other cylinders are normal.
I decided to take a look at it today so I took off the valve cover and proceeded to remove the rocker arm assembly (camshaft holder) to check if there was a rounded lobe and noticed that two of the ten bolts were so loose that I could turn them with my finger. The two loose bolts were the ones in between the dead cylinder (#2) and #1. At this point, I decided to bail on this project and proceeded to screw the rocker arm assembly back on. Neither the cam, nor the springs, nor the valves were ever touched.
I followed the bolt down procedure exactly in the Hayne's. (14 ft-lbs)
So when I got it back together, I started the car and it barely held an idle. It was MUCH worse than before. Before it was easily driveable. Not now. A few seconds after starting, I started to hear a steady knocking noise and the engine is shaking. I killed it right away. I started it again after a few minutes. Same thing. Haven't tried a third time.
I've never had this problem before.
Is there a way to damage this Honda engine like this?
Should I go back and leave those two loose screws in the way they were?
Did I possibly worsen an existing problem? Arrggghhhh! XD
1997 Honda Civic EX
Saturday, January 2nd, 2021 AT 11:29 AM