I need to find out firing order and would like to know cylinder numbering for my '05 XC90 T6...

any sights with diagrams?

 

Why do you need the firing order?
Cylinder #1 is on the passenger side.

 

I had what seemed to be a misfire, last week. Garaged it and started with the plugs. That didn't solve the problem. I borrowed a friend's diagnostic computer and connected to it and saw P0304 (if memory serves me right), misfire on cylinder 4. I bought a coil and wanted to see which cylinder was #4. I took a stab at it today and replaced just that coil. Like you said here, I counted from left to right (passenger to driver).

After replacing it, it stopped misfiring.. but now has a different problem.. seems to be in same system. I took it to kid's game tonight. After a good run to the game, seemed to be fine. After game, it didn't want to stay started. When it did stay started, it wanted to run very, very choppy....no power to move very far. I restarted and restarted and restarted, and it then ran fine.. got it home... did the same thing. It took a while on the second try, but finally got it running. Seems to be timing and seems to be in ignition system (coil, plugs, etc) but still not sure.

 

Double check under the cover and see if the insulation on one of the wires burnt and is shorting out.

 

The firing order question.. thank you for the reply.

Turns out the replacment coil was the correct fix. Afterwards, the car ran real choppy... you suggested it was a burn wire.. Good suggestion. Check into it but no burnt wires.

I bought my own obd2 tool and it told me that system was burning too rich on banks 1 and 2. Because it was too rich on 2 banks, I immediately suspected vacuum. Turns out it was right. I had reconnected vacuum and had one of the band/clamps on the edge. It slipped off even though I had tightened well. Reconnected and car runs like a champ.

Thanks again for the great reply!

 

Glad all is well.