2001 hpdi plugs fouling

[rodbolt17]

calling yamaha= waste o time.
cannot be to much oil.
air flow is rather fixed
what error code do you get when tyring to communicate with the ECU?
its gonna display something.

[wildcater]

no com with ecu

i have tried 2 laptops, i have new 1.33 and new cable with new module.

[wildcater]

hpdi fouling plugs

the only way i was able to get it running was to disconnect injectors and use starting fluid. another thing is there something with the new software thats the 1.33 version that it wont talk to older hpdi. i looked at some posts that talked about sparkplugs this motor had bkr7eku in it, and the coil leads were black. is this correct.

[wildcater]

just talked to yamaha, there was one of many things that were bothering me about oil, i drained the vst tank and the fuel was real blue in color, and the return line from the high pressure pump was also real blue. so i am going disconnect the electric oil pump and flush out vst tank and lines. he also said to ck the ground side of the injectors to see if there grounded all the time. if they are the injectors are wide open all the time.

[rodbolt17]

I will only say this once more, quit hunting oil issues.
its NOT over oiling.
injector voltage test is one of the first things you do.
each injectors ground path is con*****ed by the injector driver.
and yes, if one is trigged on that cylinder floods.
injector voltage should remain steady at 85-90 volts.

[wildcater]

hpdi plug fouling

not trying to get you upset, i am working on injectors right now ckecking voltage and grounds. i am grateful for you help, i am frustrated and real tired right now and the customer is not helping the situation, he needs his boat for work. i will let you what i find. note i must have bad new cable, i tried to hook up to new 250 4 stroke and it still sayes no com with ecv. yamaha said they would send me loaner cable till they can replace.

[wildcater]

update on hpdi , ckecked 3 four stroke engines and 2 hpdi motor with my 2 computors and cable and could not get connection with any motor, so i am guessing i have a bad cable, which is new, because i have 2 soft ware discs and neither worked so i am going to call yamaha and take him up on his offer for a loaner cable

[rodbolt17]

our USB data cable broke right at the USB plug.
use an ohm meter to check pin to pin from the USB plug to the data converter.
if yours is broken it can be easily repaired.

[ausnoelm]

dont really want to get into this, but I have been following closely, I kind of doubt I would be trusting my motor to anyone who insists on spraying starting fluid anywhere near it, let alone disconnecting injectors and trying to make it run on starting fluid alone, now I will offer my advice to wildcater, follow whatever Rodbolt says to the letter, do not question what he is saying by trying to help you.

[wildcater]

fix for z200 hpdi plug fouling

this may seem nuts but here goes, 2 nights ago before i went home i did something i had done on merc optimaxes, i disconnected the ground wire from battery and grouned it to the positive battery terminal and left it all night. rehooked it up yesterday and did injector voltage test they were fine. drained fuel from vst tank to see if i was getting to much oil from electric oil pump it was working fine. i looked around and double ckecked everything. called yamaha and told them that my cable must be bad as i had tried it on 5 different engines 4 four strokes and 2 hpdi's. so just for grins we put engine on flusher and it started and ran, ir settled down and after afew minor adjustments. what i told by merc engineer was that by grounding neg cable it draws of all voltage to ecm, i dont know it that bs but had worked on mercs and that the only thing i did differnt to this hpdi. thank for all your help every one, and again it sounds crazy., but i have seen alot of crazy thing over my last 40 yesrs of fixing outboards and stern drives.

[wildcater]

thanks for info, iwill try that, havent had time to go in that problem yet, cable was brand new

[wildcater]

to ausnoelm, i have been listen to rod bolt , but i think even rod bolt will tell you you have to think outside the box sometimes way outside, we were not reving the engine we just trying to keep it running.

[rodbolt17]

no >I think you got peed on and told it was raining.
with only 1 battery cable attached to the battery there can be no current draw.
period.
no complete circuit is no current path at all.
it simply does not pass the sniff test.
if you hooked the positve engine cable to the negative battery terminal and left all other cables off it would be the same as if you had no battery.
however if you had it that way and the attached the negative cable to the positive you may get to buy a regulator assy,driver assy and possibly an ECU.
voltage does not flow, its simply a measure of potential or electrical pressure.
current flows but only when a circuit is complete.

[wildcater]

well that what i did and the engine is running and when i get the loaner cable i can look any thing else that mite be going on. and dont insult me i have been doing outboards for over 40 years, and i will say it again you hook the ground and the positive cable together on the pos side of battery and leave overnight. and the engine started and ran the next day. this not my first trip to the crazy rodeo. this has worked on merc. it draws any small amouts of voltage that may still be in the ecm. i have talked to computer engineers and they confirmed and helped me understand what was going on. by the way i would never reverse the cables. i have never had a m otor stump me like this one and there are at least 25 mecs here and across my own little network of friends who whant to see this engine fixed, also im not charging the customer anything over the normal powerhead replacement, because i don't think any mec should learn at the customers expence. i thougt this was a forum for help not ridicule, and do thankyou for your help.

[99yam40]

i disconnected the ground wire from battery and grounded it to the positive battery terminal
what i told by merc engineer was that by grounding neg cable it draws of all voltage to ecm,

I believe it was the way you said this that is the problem.
there are 2 posts on the battery and they are the positive and the negative.
if you ground something it usually means you attach or touch it to the block or other metal part of the motor.
If you ground the positive and negative you will short out the battery

Your statement of " by grounding neg cable it draws of all voltage to ecm" does not make a lot of sense to me.

If you want to drain all the voltage off of the electronics then disconnecting the battery and then turning on the key should drain it down just like on a auto or truck and should clear the computer/ ECM