| Author | Message | ||
     Stev0 |
I've got an S3 that has had a hard life. Stood it back up as it was too unique to break up, was put together as a special for Erik when he came to Australia in '99 and has an engraved timing cover and his signature under the seat.. The bike is running fine at low throttle openings all the way to 6000 plus ... The issue is now I'm starting to crack the throttle more and it's like I've hit a flat spot which feels very similar to when a CV slide rises too quickly. Nothing is showing up as strange on ECM Spy and I'll start exploring options this week. Was hoping someone had come across a similar issue and had a simple fix. Have had similar issues with a collapsed muffler before but normally they wont rev past a certain point at all whereas this will. thanks stevo | ||
| Phelan |
I take it it's not the typical 2800-3300 rpm reversion issue? | ||
| Stev0 |
Nope, way more than that. It's flat at any revs once I go past about 20% throttle. I'll try some different things this week and see if I can pin point it. Thought I'd ask here on the off chance someone may have encountered it before. | ||
| Phelan |
Maybe a leaky diaphragm? | ||
| Stev0 |
Diaphragm ??? This is EFI.. If it was a carb it'd be fixed by now  | ||
| Phelan |
Ah yeah my bad. Maybe a clogged injector? | ||
| Kalali |
When was the last time you did a TPS reset? Does the TB butterfly open and close smoothly through the entire operating range? | ||
| Firemanjim |
Fuel pressure good? | ||
| Stev0 |
TPS reset was done as a matter of course but the issue is more than just a fine tune issue Kalali. Fuel pressure was good last time I checked Jim. The bike will happily rev to red line if I take my time, it's only when the throttle is cracked that the issue occurs. This bike had some major issues when I got it. I've replaced almost everything in the fuel electrical circuit including a complete new wiring loom and I'd finally got it running OK until I changed the pipes and intake, so I'm going to retrace my steps and see if there's a physical culprit and it'll be something to add to the memory bank. | ||
| Two_seasons |
How do the plugs look after a good run at temperature? When you did the TPS reset, did you allow for 10 minute warm up after, in closed loop mode, then take it out for a run through the gears in closed loop mode? Intake/Exhaust leak(s)possible? Use Mapp/Propane (unlit  ) around the intake/injector O-rings. Leather glove, cold engine and feel around both exhaust for leak(s). When's the last time you changed your air filter? | ||
| Stev0 |
All the normal things have been done Two-seasons.. have changed mufflers, pipes, intakes, air cleaners, 02 sensors (with the different headers). Then test ride on my twisty mountain loop. It changes a bit with different intakes and mufflers but still there.. The only thing left is a new set of injectors as this is the only good set I had left and they are secondhand. | ||
| Hootowl |
Was OK until you changed the pipes and intakes. Sounds like you need to adjust your fuel map. | ||
| Kalali |
After you have ruled out all potential mechanical/physical causes, you can try this. In ECMSpy, if you look in the "Other Maps" tab, there is a section called "Acceleration Enrichment". The values in the "Correction" section (along with the "Full Accel Revs" number) control the behavior you describe. You can either get a good known EEPROM map for your set up or incrementally tweak the table to optimize your map. Just be real patient and keep track of all your changes. P.S. The Full Accel Revs is best to be left at 1. | ||
| Stev0 |
Thanks Kalali, that's probably along the lines of what I was after.. although I'm thinking new or cleaned injectors may help too. I've got it running close enough now, to the point I can live with it. I'm running a modified race map and that brings up another issue. I have 4 modules but ECM spy can only modify one of them for some reason... and that's the Jap spec module. The two US and one Aus modules I've got wont take new maps.. The motor itself is a bit tired too but I can't see that being a large part of the problem, although I'll freshen the motor up later.. | ||
| Natexlh1000 |
Perhaps just take it out for a few rides? Varnish buildup perhaps? | ||
| Stev0 |
Thanks Kalali, that's probably along the lines of what I was after.. although I'm thinking new or cleaned injectors may help too. I've got it running close enough now, to the point I can live with it. I'm running a modified race map and that brings up another issue. I have 4 modules but ECM spy can only modify one of them for some reason... and that's the Jap spec module. The two US and one Aus modules I've got wont take new maps.. The motor itself is a bit tired too but I can't see that being a large part of the problem, although I'll freshen the motor up later.. | ||
| Firemanjim |
Really, never had an older ECM not take map changes. Have you tried to burn the eeprom instead of just the map? | ||
| Firemanjim |
And post screen shots of your maps so we can see what is up. | ||
| Stev0 |
I'm going to try burning the eeprom on the other ones later... This one has a modified X1 race map in it now, as I tweaked the off idle fuel and I think ignition a while back.. It's been running fine for quite a while and it's only recently it has had issues with acceleration. As I said, I'm not sure if it was there all the time and it's only now I'm starting to push it hard that it's becoming obvious. I tried to mod the acceleration numbers but it wouldn't save them. it said it was writing to the module but they weren't saved for some reason... | ||
| Firemanjim |
Too bad you are up high as have a mate with dyno in Numurkah.Greg is a wizard with bikes! | ||
| Stev0 |
New development this morning... The rear base gasket is leaking, so I sprayed around the starter with degreaser and washed it down... Then it wouldn't run at all Will start with zero throttle but dies either by itself after a few seconds or as soon as you try and open the throttle... It had a similar issue to this before I got the bike and it was supposedly an electrical issue.. Am letting it dry out and will see what happens. | ||
| Stev0 |
It's looking like I have a lazy, tempremental fuel pump... | ||
| Stev0 |
Tried another tank/fuel pump and this one will pump up to pressure when you flick the kill switch and then it shuts off but wont turn back on again... Looks like it's time to start chasing electrons around the wires and work out why... This may have been the intermittent electrical issue it's had all along that the previous owners couldn't pin point. | ||
| Acobosco |
Stev0 What did you end up figuring out? I am trouble shooting a S3 with what sounds like the same problems. Do you still have the EEPROM you used that seem to work well? Could I steal it if you did? Thank you, |
