turns over and over but doesn't start - 05 S4R

[ducpainter]

Hopefully it was a temp related fluke.

Good luck.

[♣ McKraut ♣]

i wish i wasn't posting in this thread again....but with warmer temps now upon us... i'm still running into this issue.  i've done the following:

yuasa battery (1.5 yrs old) load tested twice...both results showed 100% (i forget the exact cca that it was pulling, but the guy that helped me was actually really impressed with the battery)
spark plugs replaced
voltage regulator replaced with a take off from a 2008 S4Rs known to work
ECU reflashed to DP spec
fuel filter replaced last year
throttle bodies synced about a year ago
ground connection is clean and secure (all stock wires)
gas is never in the tank for more than a few weeks at a time (usually run 87 or 89 octane)
sea foam added to fuel tank a few weeks back and run through completely
clean stock ducati paper filter w/ stock (unchopped) lid
10W-40 mobil 1 4T oil
no peripheral devices on the bike (alarm, PC3, etc)
haven't messed with air bleed screws (haven't verified that they're in the "stock" setting... which i can't remember what that is anyway)

and yet, even with all of the above, i went to start the bike yesterday and cruise up the tollway to try out how the newly-flashed ECU felt, and it took me four tries to get it to fire up (with ambient temp of about 90 degrees).  i will note as a disclaimer that i have not yet reset the TPS, but hope to use someone's vdst in the next few days and get that done.  but, if that doesn't do the trick (which i'm not super confident it will, since i had this problem before ECU reflash) what else can i try?  the bike runs great once started...it's just that first part that can be a pregnant dog.

i'll try to get some video of a typical start up attempt... though i'm not sure if that adds anything or not.

[koko64]

G'day McKraut

These questions are also for everybody who knows fuel injection.

This model would have an ECU controlled enrichening system triggered by one of the temp sensors? Could the temp sensor be faulty and not sending the correct info to the ECU? It happened with and without the reflash. The enrichening program/map isn't being activated?

The symptom seems to be fuel related as others suggest, similar to trying to start a bike with no choke. It runs great when it's going but is a pregnant dog to fire up.  


Forgive me if I'm wrong as I only know carbs.

Bloody newfangled fuel injection! (Need an old fart smiley).

[seevtsaab]

I think everybody will want to know .... are the plugs wet?

[Howie]

I'm too lazy to go through the whole thread, so excuse me if this has already been asked.  Has CO trim been set?  Both TPS and CO trim need to be set.

[♣ McKraut ♣]

I'm too lazy to go through the whole thread, so excuse me if this has already been asked.  Has CO trim been set?  Both TPS and CO trim need to be set.

borrowed a VDST from a friend; will be resetting TPS tonight or tomorrow, and fuel trim as well. 

[♣ McKraut ♣]

tried resetting TPS last night with VDST.  was my first experience using one...and it was for a 5AM ecu instead of a 59M ecu (if that makes any difference, i don't know).  at one point i did get it to do the countdown, and then eventually display the "PASSED" message.  so, i *think* it reset.

took it out about an hour ago to see how it started up...and...

MOV05778.MPG

seems about the same as before

on a side note, i got to experience the wonder that is the dry clutch meat grinder first hand for the first time.  good times   

[Howie]

Now that you have the VDST check the temperature sensors, as koko64 said, no or insufficient cold start enrichment can be the cause.