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Only firing on one cyliner when hot

Tony Burgess

Just got it firing!
Joined
Jun 25, 2019
Messages
4
Location
UK
Hi Guys, I am new to this forum but have an issue with my 2011 Norge 8V.
The background is about 3 months ago the engine failed completely, after only 16k miles on the clock. The mechanics identified the big end had split completely and the engine need to be replaced.

I sourced one from Italy which is now fitted and runs sweet when cold, however when it gets hot it stops firing on the left cylinder. There are no fault codes from the ECU and the garage are a little stumped, they are not Guzzi specialists but are very trust worthy and have worked on all of my bikes.

Any ideas
 
My guess is ignition coil. The can fail when hot. Swap coils side to side and see if the right fails when hot. That will confirm a bad coil.
 
Thanks for the advice guys.

We have checked the coil and its ok.

we swapped the injector cables and the fault moves to the right. So now it is looking like it is the ECU.
I am having difficulty in getting a replacement as the serial plate on mine is missing and I need the original model numbers for the unit.
Any idea's on the unit number required, the bike has no mods. All I know is the numbers start with IAW an its either 59M or 5AM.

As the unit is expensive I don't want to order the wrong one.
 
IAW 5AM. If you have stock wires & caps, put NGK long reach caps on it. Search here, nice directions.

I would personally be checking what is missing, spark, fuel, or air. Valve check and look for rollers, most likely why the other motor lunched, if they were not changed(flat tappets).
 
We have now had a new ECU fitted, the old one had a fault that could not be repaired, and the bike is still having the same problem except now it is at certain revs. I have told them top change the HT leads, plugs and cables.

Don't know if you guys have any other ideas
 
Hi

now the bike has had a new ECU, been tested by a guzzi specialist new plugs new cam sensor new plugs and leads new injectors. The coil tests fine and works on another bike. Still it runs for 10 minutes then drops a cylinder. Absolutely stumped and has cost over £4K but no joy. Any help and advice or the bike will be sent to the scrap yard with just 16k on the clock and only 8years old
 
In an earlier post you said that you switched the "injector cable" to the right and the problem moved to that side.

Is that cable removable?
Did the shop test for continuity between connectors?
Has it been replaced?

If the cable is non removable from the ECU then the bike probably would not run by switching cables.
I'm pretty sure that the injectors fire independent of each other and in time with cam timing.
 
I had a 2000 Ducati 996 that I bought new that had the exact same issue develop.

It turned out that the connector to the fuel injector was the culprit. Upon close inspection, we discovered that the pins, when the cable was pressed together, did not seat fully together. The male pin was not sliding inside of the female, but rather pushing back into the plastic housing. You could not see this by just visually looking at the wiring or connectors!

The male-female electrical pins were making initial physical contact, but when it got hot, the pin was able to slide even more, and would intermittently back away from the female receiver in the connector causing the random cutting out. When the bike was cold again, everything was fine, but like clockwork, when it got hot, the exact same thing happened.

When we finally discovered this, it was almost at the end of our rope, mentally.

I would recommend starting at the injector itself, and disconnect the connectors, and individually use a very small flat blade screwdriver or a pick, and gently press on each pin and see if any of them recede backwards when pressed. Work your way all the way back to the wiring loom. This may be your culprit.

Given that you have replaced virtually everything, and given your symptoms which are identical to mine, I strongly believe you have a connector like I have described. Check them all. I’m almost positive you will find the same situation somewhere in the path to the injector or coil power.

Good luck!
 
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