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After installing new exhaust my 900C has always had a intermitant pop thru exhaust on decel, the marble thing helped but still would pop sometimes, was removing the air switching valve to test and see what value resistor I needed to eleminate it and get rid of the click noise and noticed the front air hose where it plugs on head didn't have a real tight connection (clamp was in place) went to auto parts store and bought some large vacuum caps to eleminate the hose's, no more pop on decel,Got to ride a bunch today weather about 70, couldn't make it pop. Just thought I'd let everyone know,if anybody has the same problem maybe it will help. Now if I can just find a 21 ohm 8 watt resistor I might get rid of my click also.
 

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Patriot Guardian
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28,016 Posts
Sure you can't just disconnect it?
It'll probably generate an FI light, and MAYBE drop into "limp home mode" if he just disconnects it.
 

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Patriot Guardian
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28,016 Posts
Still have the "air valve/noise makers" on your Vulcan air cleaner backing plate? Mine are just disconnected. Wondered if he'd tried it.
The 1500/1600, you can disconnect them. That's the intake cold idle compensation. Our exhaust "fresh air injector" is simply a set of reed valves... just a controlled exhaust leak with no electrical connection. The 900 and V2K are actively operated by the ECU.

It is interesting that we can disconnect the cold idle solenoids and not throw a code.
 

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Patriot Guardian
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28,016 Posts
I hope they didn't make it so the valve is closed when powered. Makes me suspicous when it shows a code when disconnected.
If it can be fixed with a 21ohm resistor, I'm thinking that it's a proportional valve rather than a solenoid and 21 ohms duplicates it's DC impedance... as long as the ECU sees that, it assumes it's okay.
 

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Registered
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115 Posts
The air switching valve has two hoses. One goes to the front cylinder and the other goes to the rear. If I understand you correctly, you removed the hoses from the top of the cylinders and plugged each of them AND capped the top of the cylinders as well?
 
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