I had a natter with friend who is a retired vehicle electrical engineer (JLR), he advised with intermittent faults like this, ie those that occur when the bikes warm and the fact Guzzi have stated in the manual that its “trouble prone” V23073 electrical relays can be replaced with newer versions suggests some one is giving me / you a pointer in problem solving this issue ! He suggested to me I take the “hint” and go from there !
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Sounds a fair idea Paul, I’ll revert to standard to begin with (baseline) and then see how that goes, if it needs fresh relays then that should be straightforward - do you know if they fit the same base?
Thanks,
Jeff
Hi Paul, been spending some time getting to grips with part numbers, out-of-stock relays all over the place, costs for stock parts from, er, ‘the larger distributors’, and I’ve come up with the OE part being superseded (but also OOS in various places) however the Tyco/TE/Siemens part seems to be available for much less here: Micro Relay 5-pin, Changeover, 12v 20A, With Resistor - Car Automotive Auto micro relay make and break car van bike boat
Ultimately, it’s a 12v 20A 5 pin electromechanical relay which is used not just in the automotive industry.
Thought you’d like to know.
Cheers,
Jeff
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hi Jeff - same issues - out of stock in my searches and those that are available are second hand - pulled them out though and sent them to my Brother, who’s a manager in the electronics departments laboratory at Imperial college - the OE relays I have are ok -but the plating on the connectors is on the way out …He suggested a good clean of all the contacts and keep working through all the parts in the fuel injection system each time it happens - time consuming though and could be costly.
The recomended go to for Guzzi relay replacements is Pyro Dan in America, he will happily send to England and I am told the postage is reckoned to be reasonable.
Have a look at his website
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Well, time is something I do have - had an attempted theft on Monday, thankfully just a ‘checking out the security’, however it’s left me feeling very apprehensive about keeping the bikes at the house, so looking at alternative secure locations. With that in mind I’ll be taking care to go through each and every connecter on the wiring harness, clean, then dielectric grease/sealant and go from there.
Bike thieves unprintable…
The sun shone Friday afternoon so got the tools out and sorted out the fuel filter and replaced the checked relays - few photos - the guide / forum on how to sort it helped loads - there’s not a lot of wriggle room but I found offering the end of the filter towards the opposite cylinder head and then twising through 90 degs does the trick - the same with the filter clip - the pattern part has a different format to its internal layout - but when back on the bike the fuel flowed as expected - i took off the rear connector on the floor as it woulnt budge on the bike - you need a 22 /19 mm spanner and a hammer if its been on a while , I reckon this Webber item is the original filter
Did it cure the fault?? - NOOOOH ! - the bike idles lovely abut wont take any throttle whatsoever - at least its here permanently now and not intermittent - the relays open the circuits to the fuel pump and ECU - so to have an idle they must be operating correctly to open the circuit as desired .. so - where to next ?
Hello Paul, yes that filter is exactly the wrong size for the slot isn’t it!
Interesting that having done what I have (replaced filter and pump) you’re still having issues; it’ll start but won’t take load, precisely what happened to mine.
My friend is restarting his bike repair/service business imminently and I’ll be taking the bike there for storage, for security if not convenience, at which point I’ll be reverting all earths/positive feeds to stock, install a new battery, which it needs anyway, then inspect/clean/dielectric spray each connector and give it a trial.
If the engine won’t pick up under load I’m thinking that it ‘sees’ the starting fuel requirement, as it will start no problem and tickover, but won’t deliver the progressively larger delivery to the injectors as demand requires, so then it’d be throttle position sensor (only one on the LH throttle body apparently), or maybe ECU or some other sensor.
Should be making some progress on this in the next couple of weeks.
Bike has gone to steffords at Worcester - their older boys are Guzzi trained from when they were a dealer - its the fuel pressure regulator thats failed and I’m informed its now out of stock as a part and I need one urgently - can any members out there offer words of wisdom or help finding a solution ?
Hi Paul, that’s interesting to hear, I’ve literally just put fresh relays on mine and I’m awaiting a new battery.
I do hope you get a solution and also that’s a handy thing to know in case my electrical /fuel filter & pump aren’t the answer.
Wonder if we can do a part number cross reference…
There’s a few on ebay, such as this one
It comes up as a Magneti Marelli RPM40, but Google doesn’t come up with many better suggestions. Here’s another
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Thanks Don
Ii guess this fits in the bottom of the pressure relief valve block or Manifold - the yellow bit in the diagram of item 3 ?
I had a chat with Mike Rdec today for some advice on sourcing a part, its a rare failure if its this part was his guidance, not impossible if crud has got in this valve , his thoughts are based around the TPS setting as he;s experienced similar issues before … lets see if it is this valve then move forward …all i can do is take it step by step …
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I just did a bit of googling to see what came up and found these answers, I’m no expert on the fuel injection systems, my Cali is an old carb model.
One thing I did read where someone suspected a faulty pressure regulator, turned out to be a faulty electronic fuel tap that was barely opening and not allowing enough fuel through to the system.
Bit late to the party here but if you need any pics of what goes where I have my Cali 1100i ’ 97 in bits so can easily accomodate you, Paul.
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Found this if you’re desperate,
I guess there are others similar out there.
For what its worth I run a non std pump
If the diagram in the manual is vaguely accurateI wondered if you had an air line you could test the pressure yourself and back flush the vale with a paraffin gun in case it is just a bit of crud holding it pen.
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Well , getting there slowly, Nik Walsh who Mike Rdec recommended had one available from his limited stock of old parts which has now been delivered for fitting to the bike - Stein Dinse need a few weeks to get one as they are out of stock… 29112760 -Z is the part , looks a little different the original but I am assured it does same job…
Hello,
Thank you for your inquiry.
I can offer you the following item: 29112760-Z.
Unfortunately, we do not yet have a delivery date for this item.
Mit freundlichen Grüßen / kind regards
Niklas Lippelt
Well.
New battery arrived and installed (yes, Luigi, all those nicely rerouted earths and lives are back where you designed them to be, you madman…)
Eventually she woke up and after tightening one of the fuel hoses to the regulator, ticked over nicely.
Quick burst up the road and she’s taking load throttle.
Proving will be up and down the road near the workshop while the van is in attendance… 
I’m hoping that a handful of new relays and the filter and pump have been successful. If not then I’ll try the pressure regulator, however it seems to be flowing fuel OK so far.
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