Yamaha Outboard HPDI spark plug & coil test troubleshoot bad idle no power. Spark test tool Bad coil

Yamaha outboard HPDI idle. How to check why outboard is not idling/performing correctly with no power to plain.
Spark plug firing test and coil firing test. Cylinders not firing. dead cylinders.

[@johnappleseed936]

Too much gum flapping

[@hellapellanyc6465]

Hi great vid and thanks for showing how to test the coils. In my manual for my OX66 1999 250, it also says to test the wire harness, CDI output peak voltage, charge coil peak voltage and pulser coil output peak voltage. My issue is low to no ignition spark. Is a multimeter good to test the other things. Though the manual is great, these things are a bit confusing. I don't want to order new coils and realize it could be the pulser coil as well.

[@Grady252]

Would have been nice to see the spark plug boot test for resistance also. Have been trying to figure this out and seems what I have found is you unscrew the cap from the wire, test resistance should be between 4k-6k ohms.

[@troubleshooting6716]

Anybody have rich gas coming out of exhaust do to misfire?

[@georgeatallah4465]

Nice video but can do without the music in the background

[@andrerodrigues2198]

Excellent video! Appreciate you sharing.

[@mikeschmidt8393]

This totally solved my idle questions in and out of gear your awesome

[@tudo2170]

Hi, I got the same motor like you. It ran fine before I replaced the high pressure fuel hose. Right now it cranked but don’t want to run. Do you have any idea? I did check the coil and spark. Everything works fine.

[@kiug1208]

Any idea what can be blowing the 20amp ecu/fuel pump/ coil fuse on a 2001 150hpdi ? I’ve already replaced the low pressure pumps that were bad, the medium pressure electric fuel pump in the vst ( mechanic said this was the cause of the fuse blowing ) after changing the vst fuel pump now it’s still blowing the fuse but as soon as you turn on the ignition.

[@trystandillard1186]

I have a question I have a 150 hpdi I can get about 2500 rpm’s then it’s basically just bogs and stalls out and dies or if I let off it continues to run it did have a shutter in it like it had a miss I did not know 2 and 3 did not run in idle so that answered my question why it would run so well at that time 2 and 3 were wet and had carbon build up they have new spark plugs in them I’m gonna check coils next but the 2 and 3 plugs have gas on them which means it’s not burning off all the gas or is to rich. What are your thoughts?

[@2boyparent]

Nice!

[@billyschlotterhausen4927]

Do you know if the resistance is the same for the 250hp coils?

[@edwardburrowes4243]

Hi can the coils be tested without taking them off the engine? Thanks

[@peterspagu4915]

A