Hello everyone. I am the owner of a XC90 2.5T automatic with LPG system and 370KM on it. I am struggling with a misfire issue lately. The car sometimes takes time to start in cold and even when its worm during the day. After it starts you can hear the engine is not working as it should (bit bouncy) but when it get warm you dont feel the misfire any more. If you connect the OBD you can see that there are misfires on cylinder 3. During this last 2 months twice the P0303 has shown in the errors. This is what i done so far
++ Replaced the sparking plugs
++ Replace the ignition coils
++ Clean up throttle body
++ Swap position of fuel injector nr.3 with nr.1
Again the misfire stay on cylinder 3
++ Did a compression test on the engine and all cylinders show 95PSI
++ There are days that the car starts immediately even in cold there are days it takes some time to start.
++ I dont see any oil being consumed and there is no smoke coming out of the exhaust

Any help would be great.

Thank you

 

not sure how the LPG system is engineered, whether there are any changes made to the engine internal components etc, and what issues it can introduce... I would suggest you inspect the wire harness going to the coils and look for any cracked connectors /frayed wires etc, and consider replacing. As to your compression reading, normal compression for a standard T5 is in the 150-160 PSI range but I'd have a hard time explaining how you'd get 95 across the board (if there were a burnt valve etc or a ring problem one would expect a +10% variance between cylinders).