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Offline julianhj

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Hesitation at around 2k RPM
« on: February 17, 2020, 08:18:24 PM »
I've had a recent issue where when pulling away there is a hesitation between around 2k-2.5k RPM. The bike has been looked over by a mechanic with access to full Triumph diagnostics kit, the throttle bodies have been balanced and the spark plugs replaced to no avail. The mechanic suggested it might be some poor quality fuel, so I'm going to run some BP or Shell super unleaded through it with a fuel additive - if it persists then he'll do some further investigation. The bike had a 12k service 6 months ago, and has covered less than 3k miles since (currently on 22.5k miles) - has anyone experienced anything similar, or have any suggestions as to what may be causing it?

Online Rtwo

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Re: Hesitation at around 2k RPM
« Reply #1 on: February 17, 2020, 09:19:00 PM »
Did they change the map at the 12K service?

The party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
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Check the Facts !!

Offline julianhj

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Re: Hesitation at around 2k RPM
« Reply #2 on: February 18, 2020, 05:04:15 AM »
Yes, I fitted an Arrow but was on the standard map prior to the service. It was changed to the Arrow map during the last service. The mechanic who looked at the bike last week ran the full Triumph diagnostics, which Im told includes the map and found no issues - could this be the cause, and would reverting to the standard map potentially solve the issue?
« Last Edit: February 18, 2020, 05:10:24 AM by julianhj »

Online Rtwo

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Re: Hesitation at around 2k RPM
« Reply #3 on: February 18, 2020, 05:39:24 AM »
It's only a 10 minute job to change the map so worth trying

But before you do that try the 12 minute tune, the ECU is adaptive and may benefit from it.

**KEEP YOUR HAND OFF THE THROTTLE THROUGHOUT**

1. Start the motor from cold without touching the throttle.
2. Let it idle until the fan cuts in.
3. Let it idle for a further 12 minutes.
4. Switch it off, job done.
The party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
....George Orwell

Check the Facts !!

Offline julianhj

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Re: Hesitation at around 2k RPM
« Reply #4 on: February 18, 2020, 06:45:10 AM »
Thanks, will give that a go.

Offline julianhj

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Re: Hesitation at around 2k RPM
« Reply #5 on: February 26, 2020, 10:37:12 AM »
Quick update - I tried Rtwo's suggestion and it's made a big difference (possibly solved it) - I do however have another issue which was also present beforehand where the idle after a few miles is around 1900-2100RPM. I'm going to create a separate post for that as there are some other symptoms. 

Offline healdem

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Re: Hesitation at around 2k RPM
« Reply #6 on: February 26, 2020, 01:28:57 PM »
no evidence, but it might be worth looking at the stepper motor linkeages.

Offline julianhj

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Re: Hesitation at around 2k RPM
« Reply #7 on: February 26, 2020, 01:30:14 PM »
Thanks, the mechanic cleaned the stepper motor a week or two ago, possibly related?

Offline julianhj

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Re: Hesitation at around 2k RPM
« Reply #8 on: February 26, 2020, 07:11:48 PM »
Back to square one. When I started the bike to come home, the problem immediately returned. I've noticed that the hesitation / reluctance to rev is throughout the range.

I'm guessing as the problem was temporarily fixed, that it's more likely to be an electrical or ECU issue?

Offline chuckxc

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Re: Hesitation at around 2k RPM
« Reply #9 on: February 26, 2020, 09:15:07 PM »
Have a close look and check all the tubes connected to the MAP (manifold air pressure) and throttle bodies. A small crack or some damage causing a vacuum leak could cause the problems you describe. Just an idea.
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