2008 DL650 - Idles fine, dies on revs > Help please! - Page 2 - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL650 and DL650A - 2004 to 2011 DL650 from 2004-2006 (K4-K6) and DL650 or DL650A from 2007-2011 (K7-L1)

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post #11 of 25 Old 04-08-2019, 07:51 AM
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Something else to check. The rubber vacuum caps / covers / plugs, that are used when doing a throttle body sync / balance, are know to sometimes perish.
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post #12 of 25 Old 04-18-2019, 01:05 AM Thread Starter
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Quote:
Originally Posted by blaustrom View Post
Please confirm: The bike ran normal after the valve check and plug change? Approximately how many miles since that work was done?
Valves and plugs were done at about 55k. Bike has 62k now, and was running fine until this started happening the last time I parked it (for about a week).

Got some tests done:
Did the fuel flow test, cycled key 3 times, got 300 mL.

I also took a video of the Secondary Throttle Valve Actuator, which appears to be malfunctioning:
https://youtu.be/C0CnV0rzBGI

Is this an issue with the TPS, or with the motor for the Secondary Throttle Valve Actuator?

Or might this be like Gert suggestd, and the rubber vacuum caps/covers?
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post #13 of 25 Old 04-18-2019, 04:27 AM
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Your 300ml per 3 cycles is low. Maybe the fuel filter strainer is a bit blocked. The high pressure filter could also be blocked. There have been some success in reverse pumping the high pressure filter to clear it. Google V-strom high pressure fuel filter clean + you tube
The STVA is under the control of the ECU. There have been reports of stepper motor linkages that may require lube, https://www.stromtrooper.com/dl650-d...lp-needed.html
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post #14 of 25 Old 04-18-2019, 04:50 AM
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Some more info on the STVA, https://www.vstrom.info/Smf/index.ph...c,11601.0.html, https://www.vstrom.info/Smf/index.ph...c,11110.0.html and https://www.vstrom.info/Smf/index.ph...c,10357.0.html
Some times a report of a FI code (dealer mode code) will appear, while other times no code displayed.
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post #15 of 25 Old 04-18-2019, 10:49 AM
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Any chance this is a CA emissions model? Is tank full of gas?

There have been a couple bikes here that the vapor return line started leaking and caused issues.
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post #16 of 25 Old 04-20-2019, 12:05 AM Thread Starter
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Any chance this is a CA emissions model? Is tank full of gas?

There have been a couple bikes here that the vapor return line started leaking and caused issues.
It is the CA emissions model. Gas tank is 3/4 full

I mucked around some more today, trying to find any spot of wire that had rubbed through (none found), I WD-40'd the SVTA joints and moved the rod back and forth to work it all in there, trying to clean out the moving bits. This might have smoothed out the motion, but did nothing for the problem.

There is no FI code reported. In dealer mode the -C00 is in the middle at no throttle, and goes to the top at 1/3-1/2 throttle, which seems right.

It's starting to seem more and more like either the SVTA motor is no longer strong enough to hold open the valves, there's something wrong with the ECU, or there's a wiring fault somewhere.

I have a friend coming with a '09 Wee tomorrow, and I'll try his ECU.

I'm hesitant to think it's a wiring issue, because there's no FI error code, and I would suspect one would appear with a wiring fault.
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post #17 of 25 Old 04-20-2019, 05:58 AM
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Before throwing money at it, check as Mikeys suggested, the vapor return line for leaking or blocked. From what I have read up on your CA model, it does not have a venting gas cap. Have you checked for any airlock in the fuel tank?
Don't know if you read this thread https://www.stromtrooper.com/v-strom...-canister.html

Last edited by Gert; 04-20-2019 at 06:23 AM. Reason: Add link
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post #18 of 25 Old 04-20-2019, 06:32 AM
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post #19 of 25 Old 04-20-2019, 10:02 AM
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Some spark plug wires/caps have been known to fail and cause the issues you speak of as well.

BRIAN "GO Buckeyes, GO Wildcats"!

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post #20 of 25 Old 04-20-2019, 04:06 PM Thread Starter
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Quote:
Originally Posted by Mikeys View Post
That sounds like a very likely culprit ("The issue is being caused by a crack in the vent tube inside the tank. [...] The reason that cylinder filled with fuel is because the purge hose from the evap canister routes returning vapor into the throttle bodies.")

Where can I buy plugs or end caps for the hoses/nozzles? I checked Lowes, but they don't have anything small enough.


Also: I had a friend with an '09 Wee stop by. Turns out, the behavior of the SVTA with the engine off is completely normal, so the issue isn't the SVTA motor or electrical circuit, but almost certainly a vacuum issue, as Mikeys and Gert have been suggesting.
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