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Call special sport no spark

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smudger View Drop Down
Falcone
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    Posted: 19 Aug 2018 at 18:14
Hi all . Two weeks ago went out on bike no problems. 4 hours later needed to go out again pulled bike out of shed and cranked away like mad but no start. Checked plugs and no spark. Changed all fuses . relays all clicked when powered up but swapped them round anyway. I fitted a new crank sensor but still no spark. The resistance on coils is .8 ohms input and 3.4 k ohms between input and output. The voltage between crank sensor+ and earth is only 1.5 to 2 volts . What should I be looking at next ? Thanks  
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2018 at 20:22
kill switch not working maybe or ign key but if it is turning over ...Guzzis can turn over with kill sw engaged or has fuel pump died they spit the pipe off ....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2018 at 22:34
Were the plugs wet or dry?

Are you sure you measured the coil primary resistance correctly? 0.8 is far too low, should be nearer 4.0 ohms.

Can you hear the fuel pump running?
Brian.

Better 5 minutes late in this world than years early in the next.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smudger Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2018 at 23:47
when I hit the killswitch it won't even crank , when I put it to run I can here the fuel pump prime . After cranking for some time the  plugs are still dry and there is no spark . The Multimeter is quite old and it was given to me so maybe I should invest in a new one. I'm taking the coils off and probing the two small connectors on the input side is this correct? I tried it a few times but could only get .8 ohms I'll get a new multimeter tomorrow and try with that. Should the voltage to the +'ve side of the crank sensor be more than 1.5 to 2 volts ?
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2018 at 15:21
Sounds to me that you are getting no spark and no fuel.

I suspect the coil resistance is a red herring, something is stopping both the injectors and sparks.

Things that could do this - relays, but you have swapped them round, though you could still have dud ones. Are they the original Siemens relays? If so I would suggest you get a new set, Pyro dan from the States does a good deal, and probably quicker than many other suppliers.
Equally the crank sensor might be dud too. I have no idea what voltages you would expect on that, but they can get covered in metal swarf which will stop them functioning. Fiat use the same sensor on many of their cars, so you don't have to pay the Guzzi price. See our Alternative parts section.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote smudger Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2018 at 21:16
Got a new multimeter today. Same readings, pulled one of the coils from other bike (1100i), same readings, put this coil in special still no spark. I already fitted a new crank sensor but I suppose it could be a dud. Not sure of the make of the relays but it says made in USA on them, I put power to each relay and could hear it clicking on and off. I don't know if this should work but I removed a plug and earthed it , then took out crank sensor,switched on ignition and passed METAL across sensor,still no spark. Is there any way of testing the ecu without buggering it up ?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2018 at 21:35
Firstly check all electrical connections, particularly the battery terminals, and the earth to the ECU case.
Worth also checking the ECU multipin connector and ensure it's clean. Spray some electrical contact cleaner around while you are there.

The wiring diagram is this one.
The Siemens mini relays are standard on this and are known to be a weak point.

The side stand switch can also cause problems, plus the relay.
Brian.

Better 5 minutes late in this world than years early in the next.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smudger Quote  Post ReplyReply Direct Link To This Post Posted: 22 Aug 2018 at 17:15
ok thanks , will be the weekend b4 I get chance to do much else, I read somewhere about 1 ohm resistance for the coils so they're not far out . I'll  try and get another crank sensor to eliminate that. Will post up results.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cugsy Quote  Post ReplyReply Direct Link To This Post Posted: 22 Aug 2018 at 18:07
I don't know if this will help. Sometimes my old cali starts first time and a day later nothing for about 3 cranks then she starts. But sometimes, I need to pull the clutch lever in and she starts.  Is there a clutch cut out switch? 
Honda nc750x ...hmm - a superdream for the 21st century? ZZZZZZ But the goozi is back running..yesserii jim bob. Fun time
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tris Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2018 at 07:37
Is fuse F5 good and is the ECU grounded.

From Brians drg it looks to me that if either of them has failed, you could get the fault your're describing

Can you plug this bike in to GuzziDiag and ask the ECU what ails it?

Alternatively, I see that the drawing shows a LED, I'm not sure if the attached relates to the same ECU but check out page 22 onward of the link below



Edited by Tris - 23 Aug 2018 at 07:41
2005 Breva 1100
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Falcone
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smudger Quote  Post ReplyReply Direct Link To This Post Posted: 27 Aug 2018 at 14:58
Got another new crank sensor fitted it this morning and she fired up straight away. So the first one I got must be faulty , gonna exchange it for another one and test it so I have a spare. Thanks for all the advice anyway.
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