Bad fueling at 6k revs
 

Bike in question is a 95 916SP with 20+k on the clock.

It has developed a bad fueling problem at about 6k, on a very light throttle, eg coming out of a second gear corner. Once through the fueling is spot on. The bike has the FIM programmable chip , which has been played about with by Moto Rapido, who can make it slightly better by reducing the fuel at that point, but they cannot get rid of it. the injectors have now been cleaned, the TPS checked, fuel filters changed, they have even swapped the chip for another, but to no avail.

The guys at moto rapido have been great, trying to sort this out, but they are now lost as to how to proceed. Anybody out there got any ideas of what to check change, as I want my bike back to its former glory.

Kevin

Often misfires in a narrow rpm range are from a vibration-related intermittant electrical contact problem. Very hard to find. The fuel injection relays are possible candidates.

Thanks I will get the garage to show me where they are then try to issolate one at a time.

Any other ideas are still welcome

Currently having similar problems with 1998 916SPS, (FIM chip fitted),once you are over 5500rpm it pulls fast and clean but it has poor throttle response and misfires at several points in the lower rev range.
change of TPS is the next step. Will post results when this has been done.
Keep me posted how you get on.

Sorry to hear you have the same problem, but relieved that it might not just be me. I have had the TPS checked out and it seems OK, so would be great to hear how you get on replacing it.

My 95 916 SP has just succumbed to the rectifier/regulator/wiring problem suffered by many.

The first symptoms I experienced were a slight splutter and misfire on a neutral throttle in the middle of the rev range, which got worse as the day progressed, until later on in the day when it got really bad all through the rev range....and the bike couldn't be ridden (and yes, it was fitted with a new version reg/rec).

Now this doen't sound exactly like your problem (which does sound TPS/ignition/chip/vibration related...but perhaps whilst your tinkering, it may be worth just checking your wiring leading to the regulator/rectifier?

For peace of mind if nothing else!

Blimey! Sounds identical to the problem I now have since fitting FIM UM171 Chip to my (bitsa) 916SPS (8000miles). Almost unrideable in lower rev range (2-4K rpm), splutters, spits and generally runs like a pig - making it impossible to ride smoothly and safely into and out of corners.
I have a JHP Chip for it but that is overfuelling (stinks of fuel) and is a pig to start. Am intending to call MotoRapido as I have a Trackday on Monday!

Bike has had a recent big service and TPS/throttle set up etc etc.

Maybe we can get a "job-lot" discount for finding a cure???

R X

I had a new rectifyer put on it a couple of years back, as the old one blew, much the same problem as Harv 748, and it has been off and on since then I suppose. The wiring loom was a bit melted after and Moto Rapido have now put on a new connector which has stopped this getting any worse, but I suppose it could be causing some problems still. Be interesting to know how Harv748 fixed his

Also When RickyX takes his in tell Steve that it has a similar problem to mine. I have had two FIM chips in and the original and they have all done it so do not think it is a chip thing.

Kevin S

What a hero;) You should be racing.

Actually i guess the lads use 5500 rpm a lot as it leads thru to 7, 8, 9, 10 & 11,000rpm.:eureka::lol:

Well said, I was not even going to warrant it with a reply:P

Get it right Shaun...11,500 rpm:P

See this thread...

http://www.ducatisportingclub.com/xm....php?tid=20679

In the process of doing mine today and over the weekend...

Cheers for that, let me know how it goes

Sigma are now UK importers / distributors of FIM chips and there does not seem to be much that Neil Spalding does not know about setting the little blighters up.

If you have any FIM chip set-up concerns it's probably worth giving him a call at Sigma (but not on the run up to a MotoGP weekend 'cos he will be on his way to the circuit to provide technical coverage for MCN).

Fuel problem
 

Hi there if you get stuck we have a wide band lamda sensor /sensor data logger which we would use to pin point your problem....its the ultimate way of measuring fueling and making changes to the eprom...feel free to call on 0191 3863422 ask for Marc or dave:sing:

Twas Neil who put mine in. Trouble is, my bike is not exactly as Ducati designed it to be! It may take some more head scratching to get it 100%.

Got it running OK with the old JHP Chip - off to Brands this evening so it should be OK.

R X

Ricky, my sps had awful problems when I got it, spitting all over the place, MR sorted it with another chip and later 2000 sps injectors now V smooth but feels less ballistic so perfect for the road and (my pace) trcak days

Sounds a bit pricey..what's the difference between '97 and '00 injectors??
Did Brands yesterday with the JHP Chip - 'kin fantastic but one has to practice a bit more finesse with the right hand exiting Druids etc ( compared to a 748).

R X

Luckily they did it as part of the sale as I didnt want the bike as it was! I think its to do with when they come on - with the later ones its one injector til you need both, whereas earlier is 2 inj all the time (I await to be stand corrected)

having never ridden another sps, not sure whether mine feels different or not and if the reason it was originally so jerky was because there was a fault somewhere. I think this is probably the case coz it wouldnt cruise at any speed in any gear up to 90! and roundabouts, forget it, the throttle was an on/off switch with no progression.

mine still feels like a missile to me - I must get someone who has had one before try it to tell me the difference....any offers???

Bradders,

You may be correct, however it is the chip that controls when the injectors squirt and in what sequence...therefore changing injectors will not change the sequence of firing.
However again, I note you also had a new chip so that could have changed the sequence - Steve at MR said there was an FIM chip that converted SPS Twin injector sequence to single injector only - that mod would require removal/disconnection of one injector per throttle body.
I have looked at the FIM website and there is nothing listed for an SPS that does this, but there is one listed for a 996BP...

Are you going to Cadwell..if so you're welcome to have a spin on mine but I think you'll find my suspension a bit soft for you...:sing:

Cheers,

R X

ditto mine;)

I have two injectors, just that 1 fires in at c7.5k when all hell breaks loose!!

Hope you get it sorted.
P

It\'s fixed!!!!!
 

Just been to collect the old girl and Moto Rapido seem to have done the job, they are not quite sure whether it was the cleaning of the injectors or the using of a new block connector for the rectifer wiring loom (a la Harv 748). My guess is it was the latter, especially as the problem first arose a short while after the rectifyer had blown. Must have damaged the connector, leaving it suseptable to vibration etc.

Must say thanks a lot to Steve and crew at Moto Rapido who fitted in fiddling with it around other work and thus kept overall cost down, 1st class service. Its also nice to think that my bike has taught him something he did not know.

Thanks for all your posts guys, might not have found it without you. Summer officially starts now!

Nice one....glad it helped in some way!

I've just finished doing my wiring and it all seems to be OK. Will be taking it out for more of a ride over the weekend to check.

Roll on the sun!

Cheer Harv.

I'm in Southampton, so we should meet up one day, do you get to the Hampshire meets at Popham?

Yep...have been to several...just depends if I can drag my arse out of bed in the morning or not after a night on the drinkies! Some would say I have a drinking problem...I don't agree...Its when I stop I have the problem!!!:frog:

Will try to make the next one though...haven't done so for a few months. Either that or you should pop up here to Foxes one Monday evening or the Oxon meet with Bradders from Gosport...he often drags himself up here.

I used to live in Southampton...Sholing to be precise, when I was a student...oh what mamories (sic)

I still am a student, at Soton Uni, some would say a mature one but not the wife!! Trying to get my dissertation done this summer. Send us a U2U with your details and we can arrange a meet some time, off to Assen next week, so will not be for a couple of weeks.

It's Fixed!!

Took my bike to Sigmaperformance and Neil S did some tinkering - needed a new TPS and now it is sorted.

Hurrah!! It's so good to have precise and smooth fuelling!!

R X

have not replaced the TPS yet, because it looks like my misfiring is nothing more than lack of battery power due to corroded alternator wiring. Sorting it out myself. then will wait to see what fails next.
after ten years of this pain and suffering why do I still love Ducatis?

Steve