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Discussion Starter #1
Hi all,

I'm new one here, so I'd like to say hello in the first place.

Patient: Sprint ST '00

Problem: sometimes, without any logical pattern, when idling on neutral the rpm rise. The only pattern is, that, when 'it's wrong' the rpms are steady but on 2 different levels at neutral and 1st gear.

If the 1st gear is on and the idle is +/- 1300 rpm on neutral it rises to +/- 2000.

If in the 1st gear idle is +/- 900 it rises to +/- 1200 rpm.

Previous operations: ecu swap, throttle bodies and injectors swapped, airbox swapped, crankshaft sensor has the correct voltage. Also alternator seems to be ok.

Does anyone have any ideas?

regards,
saj
 

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I would go back to basics.
  • Verify battery is at full charge.
  • Verify/recondition the electrical main ground point.
  • Inspect all of the mechanical components for integrity.
  • Renew the air and fuel filters.
  • Verify vacuum hose connections.
  • Inspect the IACV air bleed hoses for condition and security.
  • Inspect all sensor connections. Check for pin corrosion.
  • Check and adjust the throttle cable. Start at the throttle end of the open cable.
  • Check Throttle Body balance. When adjusting TB balance, maintain the IACV within a 30-35 step range.
  • If idle not within 1200 +/- 50 rpm, adjust the closed throttle position.
  • Check TPS voltages. Adjust TPS to 0.55 and 0.65vdc.
  • Do several adaptation cycles.
  • Clear the stored faults.
Some of these steps require the use of the Triumph gameboy or a TuneBoy.
 

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welcome

Hi and welcome to our Sprint forum sajgon:)

We are a pretty user friendly outfit here so I hope you enjoy.

BTW OND is one of our resident technical experts, so I would pay heed to his advice and directions, he has contributed many technical "how too's" in our blog technical section (main web page) complete with many photos step by step instructions etc.

On the noob thing, I ask all noobs to please take time to read our forum sticky for new members.

thanks,
DaveM:cool:
 

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Don't listen to Dave. He is easily dazzled by bright, shiney wrenches. The only thing I am 'expert' at is being able to admit when I'm wrong.
 

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I would check our Idle Air Control Motor. They tend to muck up. Also make sure your TPS is operating properly and sitting at the proper voltage.

In essence I am re-iterating everything OnD said now that I read his post ....
 

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Discussion Starter #7
Hi,
thanks a lot for the answer. I'm going to check iacv today, as all of the other things that OND mentioned seem to be checked before (apart from the things that require use of gameboy - in this wild country its rather impossible to find a triumph dealer capable of using it... - a long story to tell). anyway - now a bike with those variable rpms is 'almost a good bike' in comparison to what was happening to it before...

cheers from poland,
saj

I would go back to basics.
  • Inspect the IACV air bleed hoses for condition and security.
  • Inspect all sensor connections. Check for pin corrosion.
Some of these steps require the use of the Triumph gameboy or a TuneBoy.
 
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