2003 Yamaha HPDI problems

bigdawg6391

Recruit
Joined
Jan 11, 2002
Messages
3
I have 2 plugs that don't fire top left and middle right I switched out the coils and the problem stays in place. The coils are good. Is it the engin control unit? The wires check good to the cannon plug on the control unit and back to the fuse box also.
 
Last edited:

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 2003 Yamaha HPDI problems

are you testing this in nuetral on the muffs?
is it left and right while standing on the dock barking at the moon?
HPDI in nuetral wont spark cylinders 2 and 3.
cyl 3 is the middle on the starbord bank and 2 is top on the port bank.
if your testing it in gear and get the same results test your shift position switch.
or your cable adjustments.
 

bigdawg6391

Recruit
Joined
Jan 11, 2002
Messages
3
Re: 2003 Yamaha HPDI problems

Thanks for the info I was having the surging problems that all the other HPDI owners were asking about and did not know about the 2 not fireing in neutral. I went ahead and changed the filter attached to pump in the VST tank and all is well for me. Again thanks
 

cousinabe

Senior Chief Petty Officer
Joined
Nov 13, 2001
Messages
765
Re: 2003 Yamaha HPDI problems

along with the annual VST screen cleaning, the medium pressure filter/strainer needs replacement too.
 
Top