Guzzi Diag LH injector test

Morning All Have been lurking for awhile absorbing all the information.
Having a cold start issue with my 2010. Taking  a couple of attempts then runs rough until warm.
Full ballance and tune prior. Termignoni beetle map uploaded . TPS reset etc.
When I use Guzzi Diag to fire the injectors, only the RH will fire even when selecting the LH injector to test !
Bike will run after a couple of starts and both cylinders are running and getting hot.
Any one else seen this?
Thanks Regards Dean.

How many km and what year? If it's sat unused for any length of time it may have a gummy injector.

When you say it's had a full tune up? Was this done by you or by a shop?

Hi Pete. I did the valves, balance TP reset learning parameters etc myself using the information from here. Valves .1 and .15. Mechanical cam timing all double checked.
2010 with 3500 kms on it.
New genuine iwp 190 injectors
Replacement fuel hose with stronger FI hose.
New leads and NGK caps and plugs.
Stepper cleaned and can hear moving.
Idle settlles to 1250 when warm.
Farts and pops from cold. will not take throttle.

New battery also. Balancing with Morgan carbtune and double checked the readings.

Also new intake boots and all clamps tight.
Throttle body cleaned.
air bleeds closed for balancing and opened and set after high rpm balancing.
LH air blled opened slightly to balance at idle.
Stepper cleaned and hoses checked and fitted secure.
Can't find any exhaust leaks either.
I also did the roller conversion in the summer and all was ok.
Just since the weather went to 15 degrees C.
LH injector sprays when engine is running. but not in the Guzzi diag test.

Sounds like you've done everything right. I'll think about it but from this remove it's hard to make any sensible suggestions.

I looked at the info on here trying to work it out before asking. .
I would think not taking throttle from cold it is weak mixture but the plugs look rich. Smells rich too but acts like an old carb with no choke.
Will try a co trim . Currently at 4 will try 0 just because of the plug colour.

Dean68uk wrote:

LH injector sprays when engine is running.  but not in the Guzzi diag test.

Check your start-up relay and main injection relay connections. The injectors are controlled from the secondary injection relay, which activates briefly when the key is switched on. It's not active until after the main relay closes when you start the engine.

CO trim change to 0 made it worse.
Both injectors fire with a good spray pattern if you turn the engine over on the start button .but the LH won't fire in the Guzzi Diag actuator test. Testing LH or RH simply fires the RH injector.
Would a bad relay stop the injectors working totally?

Since they're firing when you press the starter, need to consider what's happening with the GuzziDiag test. I haven't used the test for a very long time, but my pea-brain vaguely recall they both fire simultaneously, despite being able to select left or right. The logic of the relay arrangement says that the main relay has to be closed for the secondary relay to be closed. The ECU grounds the injectors to fire them, so I'd be checking that with a multimeter.

Thankyou for the reply. I will look into that.
If I increase the CO trim to 10 or more the bike runs better. Go too high like 18 to 20 and the idle goes up to 1500

A 2010 would have had IWP 189's originally. It would be good to fire the 190's into a container to check the volume is equal.

If increasing the CO made it idle better, we might consider tweaking the map so it's a bit richer at idle with CO = 0.

Are the 189 and 190 interchangeable? Doesn't the 190 flow slightly more? Or could this be my issue?

Does it pull all the way to the rev limiter at 8,000 plus when it's warm?

Yes it does. Infact runs better over 4000 rpm.

OK, that rules that idea out....🤨

You have probably considered this....but Morgan Carbtune balancers suffer from vagaries like any gauge. Due to friction and assembly tolerances one tube will almost certainly read different to the other.

It is possible this is upsetting your synch so one throttle is late coming to the party.

Can you try swapping the gauges over and compare the readings when you balance?

Actually, I tell a lie. The later 2010 models did come with 190's, but there may have been a changeover area where early ones may have had 189's.

According to my own records (which I probably should have checked rather than rely on my shit memory), specs on the 190 is 10% more flow than the 189. They also have a different spray pattern. I still reckon a volume test is required. The right cylinder has higher pulse widths at idle than the left with the Termi map. Using the GuzziDiag injector test should produce equal volumes.

I put the carb tune pipes to one port to ensure the readings were equal to eliminate a false balance.
I can't use Guzzi diag to test the volume as the LH injector won't fire from Guzzi diag. Odd that it fires when the engine runs.
I think the LH cylinder runs better or stronger than the RH.
Mine did have dirty iwp189 as original but these were swapped for new genuine iwp 190s

Have you tried running the right injector off the right electrical connection and run the Guzzi Diag test?

RH injector fires correctly when you select the RH injector test. When you select the LH injector test it also fires the RH injector!
LH and RH ignition tests fire the correct side as selected.

Dean68uk wrote:

RH injector fires correctly when you select  the  RH injector test.  When you select the LH injector  test it also fires the RH injector!
LH and RH ignition tests fire the correct side as selected.

My bad
didn't read your post closely enough

My pea-brain was right. Regardless of which injector you select, both fire during the test. Just tested my own GRiSO.

Curiously, the right one was much louder than the left. I actually had to feel the left one to make sure it was firing.

Will repeat the test. Thanks for doing that.

Just wanted to say a big thankyou to all that helped me. The problem was low fuel pressure. The pump is absolutely rotten and the filter hose has split.