Rough Running Mille
Discussion
Afternoon all...
Just got in after a morning in the garage and an unsuccessful test ride and before I give in and burn the garage down I thought I'd ask here, see if anyone has any ideas / advice.
Long story short; seemingly without notice or known reason, my '02 Mille R started to run a bit rough and developed a stutter / hesitation between 4-6k revs.
I had the tank / airbox off and while poking around I noticed that one of the wires into the air pressure sensor had pulled out of the connector. New connector ordered and wired in, everything else cleaned, checked and reassembled and the barsteward is exactly the same!!
She was running better than ever after fitting a new EPROM chip and having the throttle bodies set up at Aprilia Performance, so I'm looking for advice / ideas where to start looking to track the fault.
I know a few people here have had these bikes in the past so any advice (from anyone) much appreciated.
Just got in after a morning in the garage and an unsuccessful test ride and before I give in and burn the garage down I thought I'd ask here, see if anyone has any ideas / advice.
Long story short; seemingly without notice or known reason, my '02 Mille R started to run a bit rough and developed a stutter / hesitation between 4-6k revs.
I had the tank / airbox off and while poking around I noticed that one of the wires into the air pressure sensor had pulled out of the connector. New connector ordered and wired in, everything else cleaned, checked and reassembled and the barsteward is exactly the same!!
She was running better than ever after fitting a new EPROM chip and having the throttle bodies set up at Aprilia Performance, so I'm looking for advice / ideas where to start looking to track the fault.
I know a few people here have had these bikes in the past so any advice (from anyone) much appreciated.
Get back to basics : Spark plugs , the original RSV has 2 change them . Ignition coils , ignition leads ? all the small diameter pipes under the tank / when was the fuel filter ( in the tank ) last changed / is the hose inside the tank in perfect order ? it might be starting to split ?? is the relay for the fuel injection perfect ?
So many variables but if you are methodical you can fix it !
So many variables but if you are methodical you can fix it !
Lad I know had a Mille was an 02 plate I think (did they do them on that)
Anyway he had a earth cable (again I think earth) that was rubbish and bike didn’t run quite right. Must have been a common issue as he found solution out on a forum.
He wired in a large new one and it ran better.
Sorry so vague but it’s hard to recall. All I remember is a new wire being but in in rear seat area towards tank and issue went.
Anyway he had a earth cable (again I think earth) that was rubbish and bike didn’t run quite right. Must have been a common issue as he found solution out on a forum.
He wired in a large new one and it ran better.
Sorry so vague but it’s hard to recall. All I remember is a new wire being but in in rear seat area towards tank and issue went.
Thanks for the replies all.
I did pull a couple of plugs at the weekend and all looks fine there and all leads were secure etc. but I'll double-check the other side when I get the airbox off again.
All vacuum pipes etc. all appeared fine as well as all external / visible fuel lines etc. and generally any wires / connectors that I could check.
I'll have to get the tank off again and have a look at the fuel lines connected to the pump etc. inside and see what they're like. I suppose the recent heat could've finished them off, as they'll be over 15yrs old now and probably the same for the fuel filter, so I can do that while I'm in there.
I've done pretty much all of the other known Mille fixes including voltage regulator wiring, starter solenoid etc. so I guess this is just all part of Italian bike ownership
I did pull a couple of plugs at the weekend and all looks fine there and all leads were secure etc. but I'll double-check the other side when I get the airbox off again.
All vacuum pipes etc. all appeared fine as well as all external / visible fuel lines etc. and generally any wires / connectors that I could check.
I'll have to get the tank off again and have a look at the fuel lines connected to the pump etc. inside and see what they're like. I suppose the recent heat could've finished them off, as they'll be over 15yrs old now and probably the same for the fuel filter, so I can do that while I'm in there.
I've done pretty much all of the other known Mille fixes including voltage regulator wiring, starter solenoid etc. so I guess this is just all part of Italian bike ownership
Has the side stand switch been bypassed? My Futura had issues with that where the bike would periodically miss, stutter and then pick up and go. The wires in the switch had broken and were making/breaking contact with each other at odd times and ended up, after a period of go/stop spluttering (with me changing fuel, sparks etc.) giving up completely on a French AutoRoute. in the pouring rain!
Also, failing coil packs give up under load, and with the two coils/two plugs per cylinder, can be very difficult to trace. Simply looking at the plugs in the workshop is unlikely to identify the problem.
Also, failing coil packs give up under load, and with the two coils/two plugs per cylinder, can be very difficult to trace. Simply looking at the plugs in the workshop is unlikely to identify the problem.
black-k1 said:
Has the side stand switch been bypassed? My Futura had issues with that where the bike would periodically miss, stutter and then pick up and go. The wires in the switch had broken and were making/breaking contact with each other at odd times and ended up, after a period of go/stop spluttering (with me changing fuel, sparks etc.) giving up completely on a French AutoRoute. in the pouring rain!
Also, failing coil packs give up under load, and with the two coils/two plugs per cylinder, can be very difficult to trace. Simply looking at the plugs in the workshop is unlikely to identify the problem.
Thanks K1, forgot to mention checking / bypassing the side-stand wiring, I'll add that to the to-do list.Also, failing coil packs give up under load, and with the two coils/two plugs per cylinder, can be very difficult to trace. Simply looking at the plugs in the workshop is unlikely to identify the problem.
I'll have a read up about checking coils but that one sounds like it might be beyond me at this stage...electricity baffles me at the best of times
so it could be in the van and off to Aprilia Performance for that. Update to the, annoyingly ongoing, Italian saga...plugs and leads changed this morning, side stand switch bypass mod done just in case and there’s no improvement...
I’m relatively convinced it’s not a dodgy / loose connection anywhere as I’ve had a good look / check of all visible wires and connectors and it just seems too consistent and repetitive at a specific rev range, so that leaves coils and then fuel pump.
If someone could give me a steer how best to check / test those it would be much appreciated.
I’m relatively convinced it’s not a dodgy / loose connection anywhere as I’ve had a good look / check of all visible wires and connectors and it just seems too consistent and repetitive at a specific rev range, so that leaves coils and then fuel pump.
If someone could give me a steer how best to check / test those it would be much appreciated.
Have you checked the TPS (Throttle Position Sensor)?
One of the retaining screws on the TPS on my 916 had broken, meaning it would move slightly when throttle opened/closed and this caused a rough running/splutter at low to mid RPM and would stall at idle, given that the fuelling map is all based on the TPS being correctly set at closed throttle, this is critical to good running.
I replaced the screw and reset the TPS and it ran as smooth as.
Not sure if Aprilia run a similar setup but would hazard a guess that they probably do?
One of the retaining screws on the TPS on my 916 had broken, meaning it would move slightly when throttle opened/closed and this caused a rough running/splutter at low to mid RPM and would stall at idle, given that the fuelling map is all based on the TPS being correctly set at closed throttle, this is critical to good running.
I replaced the screw and reset the TPS and it ran as smooth as.
Not sure if Aprilia run a similar setup but would hazard a guess that they probably do?
Surely hosing a 15yr old Italian bike down will just break something else and leave me none the wiser
I’ll have a look at the TPS and adjust accordingly, see what that does... I did run the diag mode on the dash earlier which gave me -1 as the TPS readout (no other fault codes) but when I had a read up on the Aprilia forums -1/0/1 can all be normal dependant on the idle screw position, so I assumed all would be OK there...
I’ll have a look at the TPS and adjust accordingly, see what that does... I did run the diag mode on the dash earlier which gave me -1 as the TPS readout (no other fault codes) but when I had a read up on the Aprilia forums -1/0/1 can all be normal dependant on the idle screw position, so I assumed all would be OK there...
Everything so far centres on electrics/ignition, what about fuel ? I had a later RSV1000R that had a most odd problem that only manifested itself after 20 miles or so. Turned out to be fuel pump. Could supply fuel to a certain level of demand, but to that level only. I changed plugs, coils, fuel filter, bypassed side stand and tilt switches, and was pulling my hair out. Spoke to Griff at Aprilia Performance, and he stated fuel pump right away. Didn't believe it quite honestly, but a secondhand pump later, problem solved. Had a similar thing with a GSX-R1000 also
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