nightmare! I hope this is your last ride on that night mare.
Gary '01 ST4 Gaston, OR
On 10/5/2011 8:58 AM, st2_michael wrote:
>
> Pse see 1st post for symptoms. This is what I did:
>
> This Group & other Ducati forums helped me take an anlytical approach
> - essentially first look at fueling and electrics. Don't forget that
> more often than not the bike would start and run perfectly.
>
> - Emptied tank, took out pump assembly, tested pump (it worked every
> time), changed fuel filter (it was clean), inspected lines (they were
> fine and firmly clamped on, both inside and outside the tank; I
> changed the inner ones anyway). All this meant that in theory at least
> fuel should reach the injectors.
>
> - Disconnected, inspected, cleaned every connector I could find,
> including of course the injectors and ECU connections.
>
> - Checked each relay (all 4 of them!) repeatedly
>
> - Checked crank position sensor (CPS) air gap; was about 1mm instead
> of 0.6-0.8mm. By the way, front cylinder does not need to be at TDC
> for this; on the contrary, as when the front cyl is at TDC the CPS
> faces recessed teeth, it it more reliable to measure the gap when the
> teeth are 'full width'. Anyway, there were 2 x 0.6mm shims present; 2
> were too much, one not enough, so I left as is.
>
> - Ensured battery was charged to the hilt.
>
> When I started the bike it fired off straight away and ticked over
> fine if slightly lumpilly. I tweaked the rear cyl air bleed open 1/4
> turn (plug was slightly sooty) and engine idled beautifully.
>
> While fiddling I disconnected each injector in turn and this resulted
> in the exact 'loss of power' symptoms. A chat with a friend pointed to
> a 'sticking' injector as the bike had not been used much for several
> months, so a dose of injector cleaner was poured into the tank.
>
> Took it for a test ride (starting and running perfectly) and decided
> to drop in on Pro Twins, near Godstone, from whom I usually get my
> spares. A cuppa and a chat later and they agreed to slap their test
> equipment on the bike. They diagnosed a series of fault codes relating
> to a weak battery (weak battery on the ST4s means injectors not
> firing, coils not firing, and a few other gremlins), and that the
> throttle position sensor (TPS) was at 1.4 degrees on idle, instead of 2.6.
>
> To cut a long story short, they took my bike in today and adjusted the
> throttle bodies spot on (TPS, balancing, CO2 levels). Bike now works
> like a dream.
>
> I guess I will never know whether one action more than the others
> cured the problem, but the more I think about it, the more I think
> that the starting problems were due to a not fully charged battery and
> the loss of power problem was due to a 'sticking' injector.
>
> Many heartfelt thanks to all contributors, and to ProTwins for their
> expertise and very friendly service.
>
> Michael
>
>
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