2001 Civic GX Random Misfire on all cylinders

[JanglinJ]

I have a 2001 Honda Civic GX that is experiencing random misfires on all 4 cylinders when starting cold (temp below 40 degrees). It gets better after the car warms up and then runs fine. I've replace the spark plugs with NGK Iridium ZFR6FIX-11 which is what was originally in the car. Three of the four coils have hairline cracks in them. I tried wrapping them with electrical tape but didn't fix the misfire on cold mornings. So I removed the electrical tape. I've taken it to the dealer and there is low compression in Cylinder 4 (around 140 where as the other cylinders are around 120) and they keep claiming that it must be the cause of the misfire. They want to charge me a lot of money to pull the head and diagnose but I think they are trying to rip me off. Could low compression in one cylinder cause misfires on all 4 cylinders? They seem unconcerned about the cracks in the coils and claim they have checked everything that could be causing the misfire so it must be the low compression. When I first took it to them to adjust the valves they said it was misfiring only on cylinder 3 but after the valve adjustment and the spark plug change it is misfiring on all cylinders when cold. Any ideas?

[ezone]

You need a better mechanic. That engine should have 180-200+ psi compression.

[ezone]

Ok, let me backpedal a sec.....
Yes, low compression can be the cause of a misfire.
But your numbers aren't right. At all.
Therefore, I can't believe any of it yet.

[JanglinJ]

I pulled out the repair estimate and they are showing 220/220/210/150 for compression. I tested it myself and number 4 was low around 150 and the other were around 200. I didn't pay exact attention to the readings. I just wanted to confirm that number 4 was indeed low. This is the CNG Civic.

[Gunner]

^yes 150 is low..

[ezone]

Yes, the 150 is low.

Next step is to figure out WHY it is low BEFORE pulling the head off.

Cylinder leakdown test is the next step.