I just replaced my crankshaft seal because it was leaking on my 2004 Honda crv. 177k miles on it and it was running fine except that annoying oil leak. Now it’s running on 3 cylinders. I replaced the crankshaft position sensor thinking maybe that failed. Nop, still runs terrible. Discovered #3 cylinder has misfires and is not firing. It had been a while since I changed plugs and had never changed coil packs. Replaced them all and still misfires. I can smell raw fuel out of the tail pipe so I’m reasonably sure it’s not a fuel supply problem. I think has to do with whatever I did when I changed the seal, but I can’t figure out what it could be.
Anyone have any ideas of what I could have done wrong or caused in my misfire? It seems to coincidental.

months ago I replaced the solenoid spool valve and oil pressure switch below it trying to stop the oil leak. Then discovered it was coming from the crankshaft seal.

 

I doubt the misfire is from anything you did regarding the crank seal. Very unrelated. Just take off crank bolt, pull off pulley, R&R seal, right?

Next time you have misfires on one cylinder try swapping components from a good cylinder first before throwing all new coil packs on it. Will save you time and money.

At this point assuming new working plugs and coils you might want to swap fuel injectors with another cylinder’s. See if the problem follows the fuel injector. However if the issue persists on cylinder 3 I would check compression of the engine. Then take off valve cover and pray that the valve lash is just out-of-spec.

Supposedly we are to check valve lash every 30k miles on these. Mines never been off but only checked every 40k ish.

 

Thank you for the response. The only reason I went ahead and changed parts is that we're at 177k miles and I thought I would try the easier solutions first. It wasn't to expensive and it now has new plugs and coils. I did end up checking the compression on cylinder 3 and it was very low on compression. so this weekend I'll take off the valve cover and see what I find. I'm praying for something I can fix without pulling the head.