Injector problem + Info

NBs996 · 24-Jul-2006, 17:15

Right then, it's probably electrical so I'm lost... hope someone can help:

Riding along quite happy, then the engine starts to pop and misfire.
Shortly after, the engine is on/off, like surging and dying repeatedly.
Pull over and it dies.
Re-start her and tickover is as smooth as yer bum, but slowly increase the revs (in neutral) until it gets to around 4k then it dies. Release throttle and it catches again at tickover and it ticks nice n smooth.
Leave it 15 mins, fire up, ride off - all fine and dandy again.

Whatsgoingon????!!!!

n

wato39 · 24-Jul-2006, 17:43

I had a very similar problem a few weeks ago and it turned out to be the pressure sensor . Good luck

NBs996 · 24-Jul-2006, 18:10

Ta guys (no, not u timothy!)

Fuel starvation was my suspicion, but i'm not sure that ties up with the on/off power (it's either 100% on or 100% off, not nufink in between). Blew through the filter, a very technical check that was, and it seemed clear. No splits in the short tubes connected to the pump either. Could it be the relay, or is that only active when the pump is primed?

Pressure sensor - d'you mean the air pressure sensor?

If only it was a mechanical prob, then it'd be a piesh of pish!

GsxrAge · 24-Jul-2006, 23:32

Quote:

Originally Posted by NBs996

Ta guys (no, not u timothy!)

Fuel starvation was my suspicion, but i'm not sure that ties up with the on/off power (it's either 100% on or 100% off, not nufink in between). Blew through the filter, a very technical check that was, and it seemed clear. No splits in the short tubes connected to the pump either. Could it be the relay, or is that only active when the pump is primed?

Pressure sensor - d'you mean the air pressure sensor?

If only it was a mechanical prob, then it'd be a piesh of pish!

Check your fuel tank breather !!

skidlids · 25-Jul-2006, 00:00

came across a similar problem once, turned out to be the cranksensor, the hotter the engine oil got the worse it was, and the hihger you reved it the weaker the signal to the ECU

wato39 · 25-Jul-2006, 07:26

Yes mate it was the air pressure sensor that could only be diagnosed by plugging it into a pc .

Nattyboy · 25-Jul-2006, 07:59

Nick - a long shot but check the loom plug going into the ECU is secure - my 748 displayed similar symptoms at Mallory last month and the plug into the loom had worked its way loose !

Nat

NBs996 · 25-Jul-2006, 09:55

Age, fuel breather seems fine.
Nat, there's no such thing as a bad idea - and so far wiggling a plug is the cheapest

Skids, stop saying expensive things! But you might be right - it's only happened when the motor gets hot chugging around slowly, tis ok once I get on the open roads and the temp drops a bit.
Think I'll have to hook it up to a diagnostic thingy and throw my credit card at it tho.

psychlist · 25-Jul-2006, 17:07

How old was the petrol in your tank

Shazaam! · 25-Jul-2006, 18:58

Perhaps dirt in an injector nozzle. Poor atomization and restricted flow at higher rpm flow demands.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode
Postbit Selector
Use Horizontal Postbit

24-Jul-2006, 17:43	#2
wato39 Registered Forum User Montjuic Posts: 79 Join Date: Jun 2005 Location: Egham Mood: Saving I had a very similar problem a few weeks ago and it turned out to be the pressure sensor . Good luck Reply

25-Jul-2006, 00:00	#5
skidlids MotoGP God Posts: 18,274 Join Date: Apr 2002 Location: Oxford Mood: Its ONLY a Bike Club came across a similar problem once, turned out to be the cranksensor, the hotter the engine oil got the worse it was, and the hihger you reved it the weaker the signal to the ECU Checkout the Desmo Due Paddock on Facebook Reply

25-Jul-2006, 07:26	#6
wato39 Registered Forum User Montjuic Posts: 79 Join Date: Jun 2005 Location: Egham Mood: Saving Yes mate it was the air pressure sensor that could only be diagnosed by plugging it into a pc . Reply

25-Jul-2006, 07:59	#7
Nattyboy Registered Forum User Ducati in my Blood Posts: 4,181 Join Date: Dec 2003 Location: Swindon, Wilts Mood: Back down to 3 :>( Nick - a long shot but check the loom plug going into the ECU is secure - my 748 displayed similar symptoms at Mallory last month and the plug into the loom had worked its way loose ! Nat Reply

25-Jul-2006, 17:07	#9
psychlist Registered Forum User Ducati in my Blood Bikes: Diavel, very non-std black & white ;) Posts: 4,701 Join Date: Aug 2002 Location: Over there Mood: Lucky? For some, maybe! How old was the petrol in your tank Reply

25-Jul-2006, 18:58	#10
Shazaam! DSC Club Member Big Twin Posts: 1,167 Join Date: Nov 2001 Location: San Diego, CA Perhaps dirt in an injector nozzle. Poor atomization and restricted flow at higher rpm flow demands. Reply