S-80 starting trouble.

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firemanjim
Posts: 14
Joined: Tue Jan 28, 2020 5:09 pm
ECU Model: S80 Pro

S-80 starting trouble.

Post by firemanjim »

We have a 2004Suzuki hayabusa, came with the DTA on it as a runner. The problem is at times it will not start no matter what I try. Thought it was fuel but checked that off. Seems at times there is no spark. I noticed even with a battery charger on it and it turned over very well, the voltage showing in the ecu dips to 10.2 volts.
Is this below some thresh hold the ecu needs to see.
I know stock Busas will do the same thing with low battery voltage. Turn over well but no spark.
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: S-80 starting trouble.

Post by Rob Stevens »

my recommendation would be to get the pc software and lead if you don't already and check if the ecu is 'synchronising' whilst cranking, this status will be found in the 'diagnostics' page. This will help point to the next thing to look at. I run a bussa and when it was a 1600 with 15:1 CR 24v was essential for it to start. Now its supercharged and will start on 12v but with 24v it starts instantly.
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: S-80 starting trouble.

Post by stevieturbo »

Do what Rob says...

But if you think it has no spark....check for spark
katana
Posts: 455
Joined: Sun Jan 27, 2013 6:08 pm
ECU Model: S60 Pro
Firmware Version: 29

Re: S-80 starting trouble.

Post by katana »

Another thing to check is the cam sensor - known to be flaky on Busa's!
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: S-80 starting trouble.

Post by Rob Stevens »

Good shout, early busa is a 8+1 later changed to 24-1 to aid starting
firemanjim
Posts: 14
Joined: Tue Jan 28, 2020 5:09 pm
ECU Model: S80 Pro

Re: S-80 starting trouble.

Post by firemanjim »

So, changed the 12 volt feed and that helped, and then today while adding fuel down low it started to run ragged, now I have spark, but no injector signal??

Changed cam sensor and just ran test per manual on crank sensor and it is identical to a spare I have.
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: S-80 starting trouble.

Post by Rob Stevens »

Can you clarify the cam sensor is being used? either check the software or disconnect when running.
Why were you adding fuel?
Sounds more like poor wiring to me.
firemanjim
Posts: 14
Joined: Tue Jan 28, 2020 5:09 pm
ECU Model: S80 Pro

Re: S-80 starting trouble.

Post by firemanjim »

I ohmed wiring from ecu to injectors and it checked out. Where in software can I check on cam sensor? And sometimes it starts and other times, nothing---
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