2005 Gen 1 sputtering / low power at bottom end - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 14 (permalink) Old 03-25-2020, 10:00 PM Thread Starter
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2005 Gen 1 sputtering / low power at bottom end

I have a sputtering and low power below 2,000 rpm’s. This makes acceleration from a stand still hard, but once up to speed she runs like a champ. I have checked the coils (primary & secondary) / new plugs / trimmed back the plug wires / good compression test / Seafoam. Check to make sure that the tube to the MAP sensors was clear. Loss guys have an idea what I can look at next.
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post #2 of 14 (permalink) Old 03-26-2020, 12:58 PM
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Originally Posted by Thomas Leggemann View Post
I have a sputtering and low power below 2,000 rpmís. This makes acceleration from a stand still hard, but once up to speed she runs like a champ. I have checked the coils (primary & secondary) / new plugs / trimmed back the plug wires / good compression test / Seafoam. Check to make sure that the tube to the MAP sensors was clear. Loss guys have an idea what I can look at next.
Hi Thomas,

My '05 had a problem with its Throttle Position Sensor (TPS) in 2011 or 2012 at circa 45K miles. The throttle responded unexpectedly, i.e. accelerate un-announced, or not accelerate when I twisted the throttle. Unlike yours, however, my issue also occurred at highway speeds. The dealer replaced it under warranty and once replaced the problem never returned.

While not a common issue, there were more than a few instances and you can research the issue under "TPS". Maybe or maybe not related?

Good luck and keep us posted!
Patrick
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post #3 of 14 (permalink) Old 03-26-2020, 01:08 PM
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A Throttle Body synch would be next in line IMO, just so you know it's good.
My '05 only stumbles off line when it's really hot outside, fans on, stuck in traffic etc...
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post #4 of 14 (permalink) Old 03-26-2020, 01:33 PM Thread Starter
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I have a Throttle Body / vacuum synch tool coming on Friday “I hope” and a different set of coils just to have some to test with. I may try a hand held propane unit to check for vacuum leaks as well. Just bothers me, I thought I would have found the issue by now. It is consistently there so it will be found, nothing worse then an intermittent problem!
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post #5 of 14 (permalink) Old 03-26-2020, 11:51 PM
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It does kinda sound like a TPS problem. You won't likely find a coil problem, nor will the sync drastically change what you're describing.
What happens with the TPS is (and it can test good, btw) the fingers or wipers on the resistance board wear into the board. Now the ECU is not seeing consistent throttle position. It's a pricey little part. I posted a write-up by a friend of mine on another forum somewhere here, will have to find it. Basically, you can backprobe the connector and test it that way, even monitor it say on a short ride.
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post #6 of 14 (permalink) Old Yesterday, 08:27 AM
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Thomas,
Where are you located?
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post #7 of 14 (permalink) Old Yesterday, 08:48 AM
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Quote:
an idea what I can look at next.
Check the rubber caps on the vacuum nipples used for the throttle body sync. Mine were cracked and hard causing vacuum leaks and similar symptoms to yours.

Robin
2008 Yamaha FJR1300A
2004 Yamaha FJR1300 (sold)
2000 Kawasaki Concours (sold)
...etc.
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post #8 of 14 (permalink) Old Yesterday, 09:18 AM
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Surgery of TPS sensor.
https://www.fjrowners.com/forums/9-f...-question.html

Ray
Keep yer stick on the ice....
2014 FJR1300A - Root Beer (sold)
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post #9 of 14 (permalink) Old Yesterday, 09:19 AM
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See post 2 for back probing and testing...
https://www.fjrowners.com/forums/9-f...-question.html
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Ray
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post #10 of 14 (permalink) Old Yesterday, 04:54 PM
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had 2 TPS go on my 03 and then 1 on my 2nd 05....haven't had any problems on any of my FJR's since
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