Hi there, I've got a MS DS1000 (2003), recently done the sprag, and since took to Ducati to do TPS reset, and I've balanced the TB's. Since the TPS reset, it has run very, very rich and can't put my finger on what it may be. Has anyone experienced similar issues, or know what the fault could be? FYI - it has a Termi slip-on, but standard ECU, so shouldn't over-fuel on this (to my knowledge, should run leaner if anything).. please feel to correct me if I'm wrong! Cheers, Doug
unless anybody thinks otherwise i would start there. but the usual checks apply, air filter, leaking injectors etc
Has it just started running rich ? If so could the dealer have richened it up whilst setting TPS I had one that ran rich as it had been flashed with a dp map when the cat was in place and the airbox std
Yup - put it all back together and got it running sweet, but throttle was sticking, so took it to Ducati to GET TPS reset before I could balance the TB's properly. Wasn't overfuelling beforehand, but since having the TPS reset it stinks! That's my thought - they may have put another map onto it; so regardless what I play with, I won't fix it! I'll give them a call shortly! Cheers, Doug
Hopefully it's related to the TPS reset and the dealership will correct whatever mistake they may have made. However, it occurs to me that the ECU will give you a rich mixture for a cold start and it will use a temperature sensor to determine engine temperature. So could there be a problem with your engine temperature sensor?
Indeed, that was the first port of call, so the temp sensor has already been replaced in this whole process.
Yup, you're right! O2 sensor & closed loop ECU was introduced on the '07 model. Sorry, was on the go previously didn't read the question properly, but haven't removed any sensors!
hmm, probably not related to the oxygen(lamda) sensors then, brings you back to engine temp sensor, mapping or tps i guess.
Apart from the sprag failing, were you happy with starting and performance of the bike/mpg*before TPS and throttle body work? I’m sure you know, when a bike gets a bit older and has a few differences from standard spec (‘wear and tear’ , exhaust changed etc) there will always be a compromise when setting up these two - i.e. what is an ‘ideal’ setting? You know what’s coming next, if you were happy with previous setup, then you need to look at how much TPS was moved from earlier adjustment*, and recheck throttle body balance/air bleeds.
Hi Chris, in answer to your question, Yes. I had the sprag done and it started on the button, idled fine but rev's just weren't coming down on throttle so did the TPS reset, and that's what seems to have thrown it into over-fuelling. Phoned Ducati, and they informed me they did not touch the map, or put an update on when they did the TPS...
So many possibilities as usual, how is your stepper motor? I don’t think they tend to jam open but a misbehaving one could cause idle speed problems for sure. Would be interesting to hear what others think, but not dropping down from high revs could be caused by several things - did TPS reset cure or help with this?
I think stepper is ok, but it wouldn't be the first time I have heard of these failing. Just seemed very odd that it idled prior to getting TPS reset, now it won't idle at all! Having the TPS reset has completely solved the rev's sticking, and it goes up and down the rev range absolutely fine now. I've bought another set of TB's off a running bike, so will wait and see once these have gone on. But failing this I think it might be another trip back to Ducati to plug in the ECU, and make sure it is mapped as they say!
If you have complete silence you can hear (and feel for that matter by touching) if the stepper motor is doing it's initial checking sweep either when you switch ignition on or reconnect battery (forgotten which). It does the first stroke (to fully open I assume) quite quickly and then takes a bit longer to move to it's predetermined setting. I know people will cringe as the 'system' is supposed to govern itself re: idle speed if all working correctly, but there is a butterfly stop screw on the R/H end of throttle body which you can just about access without taking 'glove compartment' off. Before I knew what was wrong or right on my first Multi I used this to at least get an idle while I sorted things out. It's a small allen screw and if totally caked with yellow paint then it might deter you from touching. You would only do this as a last resort after trying everything else and in particular TPS, throttle balance and air bleeds. You shouldn't have to touch balance either and as before, if caked with yellow paint then I tend to leave alone unless tank is off and can physically compare butterflies opening. Did you count how many turns your airbleeds are 'undone' btw?
