Had my 06 Sportsman 500 EFI on the bench at my local polaris dealer for over 4 weeks and they can’t seem to diagnose a backfire issue.

Unit idles fine but backfires when any throttle applied.

Originally they said it was sensor in the airbox….solved nothing. Then they replaced the injector and MAP sensor grommets….solved nothing.

Now they want to start replacing PDM and ECM? Could either of these cause a backfire issue? I don’t want to dump big money into parts for no reason anymore.

Should they not have a way to bench test or check if they are ok via laptop?

Had my 06 Sportsman 500 EFI on the bench at my local polaris dealer for over 4 weeks and they can’t seem to diagnose a backfire issue.

Unit idles fine but backfires when any throttle applied.

Originally they said it was sensor in the airbox….solved nothing. Then they replaced the injector and MAP sensor grommets….solved nothing.

Now they want to start replacing PDM and ECM? Could either of these cause a backfire issue? I don’t want to dump big money into parts for no reason anymore.

Should they not have a way to bench test or check if they are ok via laptop?