The continuing saga of the Griso misfire.

[Trogladyte]

This is starting to bug me. I don't know whether I have one issue or two.

This is a 2008 8v Griso. For a good few years it has started on one after a good wash. But it sorted itself out when it warmed up and all was well. It was always the left pot that didn't start.

A few weeks ago it started running on one in heavy rain. I assumed it must be water pooling in the plug well. It already has NGK suppressor caps. But I changed the HT leads and suppressor caps on both sides.

It's still doing it. When wet, the l/h pot won't fire (unless you really wind it up - at about 5k rpm it kicks in. With a vengeance. You don't want to do this in first on a wet road. Don't ask me how I know this.

What's next to check?

Also, even when bone dry, I am getting what feels like occasional misses when cruising at constant speed on a very neutral throttle. As soon as I give it some gas, it pulls very nicely.

So is this all one thing?

Can you just collectively get me to stop pulling my hair out. I haven't got quite so much of it these days.

[pete roper]

Is it shorting at the coil? What errors are you getting when it occurs? Anything?

It's obviously dropping either the spark or an injector. Have you cleaned and checked the LH injector plug?

Do you know how to access the OBD?

Pete

[Trogladyte]

Hi Pete.

No - no it's not showing any errors on the dash. I can't see any shorting at the coil - I've tried it in the dark.

No I haven't looked at the injector plug. I'll look at that in the morning. Will it be obvious to me where that is?

And no I don't knw how to access the OBD. I did play with Guzzi Diag a while ago, and have a cable. But I was running the Linux version and that pc is in laptop heaven with all the other dead laptops that didn't go evil. I guess I could d/l the windoze version.

[pete roper]

Go into the menu, scroll to 'Diagnostics', enter the code 12425, scroll to ECU errors and see if any are active an then go to dashboard errors and see if any are active or memorised.

Do this when its firing on one as if there is an ECU error it won't list it as memorised, they only show up when active.

Pete

[CalVin2007]

  While it's idling on both cylinders,mist a little water from a spray bottle on the coils and wires. That may make it easier to find the location of the spark jumping to ground if that's what's happening.

  Terry

[Bisbonian]

I had a motorcycle that had a shorting coil once. I found the coil problem after washing, I could hear the snapping as the spark jumped.

I ordered a new coil but in the meantime I sprayed the old one with some ignition sealer. I never ended up replacing the coil as the sealer seemed to do the trick and I never had any more problems.

The sealer should still be pretty cheap as an easy test.

[beetle]

Swap the coils. If the fault follows....

[Trogladyte]

OK I'll see if I can read any error. I'll get the hosepipe out.

I've zapped the coil and HT leads with that Holts ignition sealer stuff. Hasn't made any difference.

[Trogladyte]

Quick update

There are no errors recorded.

I replaced the HT leads (made some up - I can't believe what the OEM leads cost!) and put new NGK caps on. I then took the tank and wings off and took apart, cleaned, and damp-sealed every connector I could find. I paid particular attention the left hand injector wiring. The contacts did have some mild corrosion.

I wasn't feeling too confident about it, but I risked riding to work on Wednesday, as heavy rain was forecast for the evening.

I left work at about 7, and it was raining persistently, but not heavily. After about 10 minutes of my 40 minute urban ride home, it started raining heavily. But the bike didn't miss a beat.

So I am hoping that's done it. Although I think I probably need to give it a hose pipe test just to be sure!

[nobleswood]

 

[yogidozer]

Swap the coils. If the fault follows....

I would try this suggestion.

[lucian]

Almost certainly the plug caps, The  NGK's do not have tight fitting bottom seals like the oem's. I believe it was Leafman here on the board who found you could take the seals from another Ngk set ( sb05f's) and swap them onto the ones you have. I have the same problem with my 09 in the wet. It's no wonder with the gaping hole above the header funneling water straight to the plugs.Although the factory caps are fragile they are much more weather proof and probably worth going back to if you ride in the rain.