Rough running when holding throttle - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 8 Old 07-14-2017, 10:25 PM Thread Starter
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Rough running when holding throttle

I've had some issues with my TPS in the past and the bike wanting to die so I thought i'd adjust it to get a little more life out of it before I replace it. I moved it to the upper lever mark at 1600 rpm and the bike has a much smother response and doesn't pop and backfire when engine braking. When in neutral and holding the engine at 3k or 4k the bike pops and backfires and moves up and down the tachometer by about 1k. I would assume that its just the TPS still going, but is it possible that the air intake sensor is going too? It's definitely running rich and only gets 47mpg. Any thoughts?

2006 V-Strom 650 Adventure+
1976 KZ750 hard tail
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post #2 of 8 Old 07-15-2017, 12:45 AM
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My K7 with 85K miles had unsteady idle hunt from >1300 to <4000 RPM and it turned out to be worn throttle body shafts and leaky seals. How many miles on your bike?

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post #3 of 8 Old 07-15-2017, 01:44 AM Thread Starter
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That's the weird part, at idle its totally smooth. I'm thinking that the TPS is more gone than I thought and that its output signal is fluctuating like crazy. When I adjusted it I noticed that I couldn't get the high mark to kick in at 2k like I wanted, only 1600 and then 3200. It would skip the whole band between those rpms when trying to adjust it. I don't know if that's normal or not.
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post #4 of 8 Old 07-15-2017, 02:15 AM
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I think you'll need to bite the bullet and replace your TPS and see how it goes. I had stalling when coming to a stop and replaced the TPS which fixed it but it had no effect on the idle issues.

Pink Floyd: And did you exchange a walk-on part in the war for a lead role in a cage?
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Current: 2014 V-Strom DL650 ABS Red
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Past: Suzuki: DL650AK7, GS400; Honda: CB125, Express 49cc
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post #5 of 8 Old 07-17-2017, 07:58 AM Thread Starter
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ugh! That's an expensive part for a fresh graduate that can't get hired lol. But seeing as it's my main mode of transportation, I think your right. Thanks guys as always.

2006 V-Strom 650 Adventure+
1976 KZ750 hard tail
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post #6 of 8 Old 07-17-2017, 08:21 AM
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47 mpg isn't necessarily all that bad. While it may be the TPS, I would really check carefully for any vacuum leaks.

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post #7 of 8 Old 07-17-2017, 03:12 PM
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Quote:
Originally Posted by KZCool View Post
ugh! That's an expensive part for a fresh graduate that can't get hired lol. But seeing as it's my main mode of transportation, I think your right. Thanks guys as always.
I think some riders have swapped the secondary with the primary TPS, at least as a test. They are the same sensor and a flaky secondary seems to be less deleterious than a flaky primary TPS. Alternatively, you could roll the dice and buy a used one off ebay. Also, per RealShelby, get a can of carb cleaner and spray around the TBs and vacuum hoses to see if you can rule out a leak. If you don't know how to do that there are a lot of youtube videos that show how.

Pink Floyd: And did you exchange a walk-on part in the war for a lead role in a cage?
---------------------------------------------------------------------------------------------
Current: 2014 V-Strom DL650 ABS Red
Next Up: ?
Past: Suzuki: DL650AK7, GS400; Honda: CB125, Express 49cc
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post #8 of 8 Old 07-17-2017, 04:00 PM
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The TPS and STPS are the same on 2007 and later 650s as well as Vee2s. Earlier Wees and all Vees have different parts.
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Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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