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At wits end with Startus Interuptus

Earl Bowman

Earl Bowman

Tuned and Synch'ed
Joined
Jan 11, 2017
Messages
32
Location
Central Valley of California
After reading and commenting on this post
A different kind of startus interruptus
Discussion in 'BNS12 Chat & Tech' started by pswiatki, Oct 10, 2019.

I am at my wits end trying to solve my startus interuptus issue. I'm having the EXACT same issues as pswiatki above. The starter gives a very strong "thunk" upon pressing the start button, then nothing happens. The fuel pump and dashboard cycle appropriately but no cranking occurs. I had installed MPH Cycles relay wiring kit some time ago and all was good for a year or more. I have moved the ground wires to the larger engine bolts under the throttle bodies, cleaned and checked the battery connections, disassembled and cleaned the starter button contacts, cleaned and replaced the fuses and contacts, replaced the starter and cleaned up all the relay plugs. If i connect my power probe to the battery it reads 13.2 v fully charged at the terminals and at the starter connection. If I use the probe to send battery voltage directly to the starter solenoid it cranks and starts EVERY time. I have load tested my Anti Gravity Li ion battery (480 CCA) and my tester says it's good. When this all started it would take between 5 and 20 times hitting the starter button to engage the starter then eventually that went to "never". I love this bike when it starts but I can't ride it if it won't start reliably and I'm now so frustrated I'm actually considering the unthinkable... Help!
 
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Kevin.NZ said:
So if you put 12v directly to the solenoid and it starts ok I would look at the relay that sends 12v to the solenoid, could be burnt contacts, just a thought.
Click to expand...
Thanks, that was my next thought, too. I thought someone posted a couple years ago that Triumph used the same relays that we have but I couldn't find the post in my search. Anybody know if that's true and if so which models crossover?
 
In 2006 I ventured for the first time into fuel injected Guzzis. A 2000 V-11 Sport.
I had owned it for 2 days (!) when the starter relay failed. The dealer and service manager knew nothing.
The early relays were flawed.
Someone had slipped me the name Guzzi Teck.
Here I found Dan Pernuski (forgive me if a misspelled the last name) of DP Guzzi. You better give him a shout.
He had done all the research and sourced the proper relays for all of us to ride in peace.
GT-Rx® said:
Our friend Dan always has the latest and greatest; http://www.dpguzzi.com/relay.htm
Click to expand...
You are both in the US, so a couple of days in the mail should be all.
Go for it, and good luck.
 
Nordicnorm said:
In 2006 I ventured for the first time into fuel injected Guzzis. A 2000 V-11 Sport.
I had owned it for 2 days (!) when the starter relay failed. The dealer and service manager knew nothing.
The early relays were flawed.
Someone had slipped me the name Guzzi Teck.
Here I found Dan Pernuski (forgive me if a misspelled the last name) of DP Guzzi. You better give him a shout.
He had done all the research and sourced the proper relays for all of us to ride in peace.

You are both in the US, so a couple of days in the mail should be all.
Go for it, and good luck.
Click to expand...
Just checked out Dan's dpguzzi page and the FAQ section says none of his relays fit Breva, Griso, Norge or later model MG. Ugh! Back to the Aprilia drawing board I guess.
 
Relays aside, I don't see where your "Startus Interuptus" is any different than everyone else's.
It sounds like the system works right up until the starter solenoid engages. At that moment the voltage the ECU sees drops below it threshold for starting (the starter system is trying to draw voltage), and the ECU aborts the starting attempt.
It sounds very typical to me.
 
the smartest thing to do with all Guzzi's is to get all new 5 prong relays from DP and replace the stock ones. use deoxit on the connections and pull and clean all every few years. odds are his web site isn't updated. also you can walk into any auto parts store and get a new one. no need to pay 3 times more at a bike shop.
Most likely your problem is just a dirty ignition switch. put a old towel under it so you don't spill on the fender and flush the crap out of it with spray electrical cleaner.
 
Sadly you can't walk into any parts store and get them. They are used on later Guzzi and Aprilia models. They are not the normal industry standard relays.

Don't know if Dan now stocks them, he certainly didn't when I asked.
One alternative - others also exist I'm sure - af1racing.com/store/Scripts/prodView.asp?idProduct=4345
 

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Earl Bowman said:
Just checked out Dan's dpguzzi page and the FAQ section says none of his relays fit Breva, Griso, Norge or later model MG. Ugh! Back to the Aprilia drawing board I guess.
Click to expand...
Oy, didn't know that. Now noted. I would also look at the starter solenoid. It is noted here on the site that it can get sticky... perhaps worth pulling apart and cleaning in addition to the wiring circuit due to the age of the bike.
If you get too frustrated, send it down and we'll make it a GTM build. ;)
 
If all else fails make up your own wiring circuit and install. Then it will work all the time, just delete the errors you get on dash once in a while.
 
GT-Rx® said:
Oy, didn't know that. Now noted. I would also look at the starter solenoid. It is noted here on the site that it can get sticky... perhaps worth pulling apart and cleaning in addition to the wiring circuit due to the age of the bike.
If you get too frustrated, send it down and we'll make it a GTM build. ;)
Click to expand...
Thanks, Todd. I'll keep that in mind.
 
Brian UK said:
Sadly you can't walk into any parts store and get them. They are used on later Guzzi and Aprilia models. They are not the normal industry standard relays.

Don't know if Dan now stocks them, he certainly didn't when I asked.
One alternative - others also exist I'm sure - af1racing.com/store/Scripts/prodView.asp?idProduct=4345
Click to expand...
Thanks, Brian. I already had the replacement relays in my que on the AF1 site but thought I'd make one last plea for any new ideas here before pulling the trigger on them.
 
GuzziMoto said:
Relays aside, I don't see where your "Startus Interuptus" is any different than everyone else's.
It sounds like the system works right up until the starter solenoid engages. At that moment the voltage the ECU sees drops below it threshold for starting (the starter system is trying to draw voltage), and the ECU aborts the starting attempt.
It sounds very typical to me.
Click to expand...
That's right, it's finding the source of the voltage drop that is so frustrating.
 
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