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DrJ

2003 Vstrom back-firing?

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I need some input/direction from those in the know...

 

 

 

I own a 2003 Suzuki Vstrom DL1000. Late last Spring, my bike began to back-fire any time I backed off the throttle. The problem either began or at least became more noticeable after I cleaned my K&N air filter. This back-firing problem has not improved or worsened. Some have said it might be the mapping on my Power Commander, but it has been on my bike since day one. Others have said it might be the throttle position sensor. Ideas? Suggestions on how and where to assess this problem?

 

 

 

Thanks.

 

 

 

DrJ

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It's probably on it's last leg and not worth salvaging. I'll give you $1000 for it :whistling:

 

 

:biggrin:

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Since I like you I will give you $1200

 

 

do you have an aftermarket exhaust on that also?

Pair valve????????

I know they say the pair valve on the cbr is responsible for popping on decelleration.

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I recommend not backing off the throttle....when it doubt, gas it!

 

in fact...why not replace that nasty twist grip with a on-off toggle switch?

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It's probably on it's last leg and not worth salvaging. I'll give you $1000 for it :whistling:

 

 

:biggrin:

 

 

 

Well, that would be one solution. However, I was looking for another equally simple solution...Still, I appreciate your willingness to help out a buddy in need!!

 

 

 

DrJ

 

 

 

Since I like you I will give you $1200

 

 

do you have an aftermarket exhaust on that also?

Pair valve????????

I know they say the pair valve on the cbr is responsible for popping on decelleration.

 

 

 

Randy,

 

 

 

Thank you for the even more generous offer....

 

 

 

Yes, I have a set of Remus titanium aftermarket cans on the bike. My hunch is that the cans are about 4 or years old and probably have 27,000 on them....Does that help any in making heads or tails of this presenting problem?

 

 

 

DrJ

 

 

 

I recommend not backing off the throttle....when it doubt, gas it!

 

in fact...why not replace that nasty twist grip with a on-off toggle switch?

 

 

 

Finally, some useful advice--just stay on the gas!! As for the toggle switch, I'm sure I could find room on that dash for just one more accessory!!

 

 

 

DrJ

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I need some input/direction from those in the know...

 

 

 

I own a 2003 Suzuki Vstrom DL1000. Late last Spring, my bike began to back-fire any time I backed off the throttle. The problem either began or at least became more noticeable after I cleaned my K&N air filter. This back-firing problem has not improved or worsened. Some have said it might be the mapping on my Power Commander, but it has been on my bike since day one. Others have said it might be the throttle position sensor. Ideas? Suggestions on how and where to assess this problem?

 

 

 

Thanks.

 

 

 

DrJ

 

Dr J...

I think you answered your own question. If your backfiring issue began or became noticeable after you cleaned your K&N filter, it stands to reason that something has changed during your cleaning process, as in:

Too much oil on the filter, a hose clamp left loose/hose off a port/hose pinched, something that allows too much air to enter the intake or exhaust during a high-vacuum condition, as in deceleration.

To start, I'd retrace all my steps during your last servicing, and if available, install the oem filter and retest. Beyond that, I'd check all engine mechanical, ignition, and fuel system operations before changing any single other part or performing any single other mod.

As one of my Mazda factory test specialists says...

"Always look first where the human was last"

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Dr J...

I think you answered your own question. If your backfiring issue began or became noticeable after you cleaned your K&N filter, it stands to reason that something has changed during your cleaning process, as in:

Too much oil on the filter, a hose clamp left loose/hose off a port/hose pinched, something that allows too much air to enter the intake or exhaust during a high-vacuum condition, as in deceleration.

To start, I'd retrace all my steps during your last servicing, and if available, install the oem filter and retest. Beyond that, I'd check all engine mechanical, ignition, and fuel system operations before changing any single other part or performing any single other mod.

As one of my Mazda factory test specialists says...

"Always look first where the human was last"

 

 

 

Terry-

 

 

 

Thanks for your input. I'll remove the tank and check all the hose clamps, etc. although none are removed or even moved to remove/install the air filter. As for the air filter, I don't have the OEM one as I've been running the K&N for 30,000+ miles. I've cleaned & re-oiled the K&N on a yearly basis for 5 years without incident but who knows, I'll check it anyway...Then, I'm not quite sure what to do or where to go. Any recommendations for local Suzuki service?

 

 

 

DrJ

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The Vstrom could definitely use more cow bell. If a great legend like Bruce Dickinson asks for more cowbell then I think we ought to give him what he wants. Yeah I was no help. +1 on checking cables and seals. :yes:

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Check for any cracks (dry rot) in any rubber boots, seals, Etc. between throttle bodies/head. Sounds like an air leak (sucking air) Back fire on decel is a lean condition I beleive.

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Check for any cracks (dry rot) in any rubber boots, seals, Etc. between throttle bodies/head. Sounds like an air leak (sucking air) Back fire on decel is a lean condition I beleive.

 

 

 

Good advice, Bro-

 

 

 

I'll check my rubber for holes & cracks, as well as for tightness.

 

 

 

DrJ

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Good advice, Bro-

 

 

 

I'll check my rubber for holes & cracks, as well as for tightness.

 

 

 

DrJ

 

Don't forget dry rot :biggrin:

 

tightness I guess would be quite a problem for you :biggrin: :blink:

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The Vstrom could definitely use more cow bell. If a great legend like Bruce Dickinson asks for more cowbell then I think we ought to give him what he wants. Yeah I was no help. +1 on checking cables and seals. :yes:

 

 

 

Dominick-

 

 

 

Will check cables and seals... I assume with cables, I'm checking for fraying/stretched, and cracked seals, etc.

 

 

 

DrJ

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Now that I know what Honda really means, I'll pass on the Honda stickers, Kev..... :biggrin: :biggrin:

 

 

 

DrJ

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You mean like this one?

 

Honda-gay-wing-decal.jpg

 

Remember....fairies have wings :supergay:

 

 

funnysign.jpg

 

 

 

 

 

 

 

 

 

I think this one is more appropriate:

 

kawasaki_logo_gay.sized.jpg

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Boys,

 

 

 

Be nice; it's only a back-fire problem, and nothing more....Spread the love and not the goo!! :blink:

 

 

 

DrJ

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