What is this? - GSXR.com
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post #1 of 5 (permalink) Old 04-15-2019, 06:07 PM Thread Starter
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What is this?

So I’m noticing that this is the same vacuum switch that is also on the throttle bodies, but this one under the seat has no line connected to it? Is it supposed to have a vacuum hose connected to it and if so... from where?
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post #2 of 5 (permalink) Old 04-15-2019, 06:08 PM Thread Starter
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This is on my ‘06 GSXR750
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post #3 of 5 (permalink) Old 04-15-2019, 06:54 PM
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That is the atmospheric or ambient pressure sensor (APS). It is just open to ambient pressure and no hose should be attached to it.
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post #4 of 5 (permalink) Old 04-15-2019, 07:24 PM Thread Starter
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Okay. Thanks. I’m curious why the other one is connected to the throttle bodies? Sorry if that seems like a dumb question
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post #5 of 5 (permalink) Old 04-16-2019, 05:24 AM
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The other one is the Intake Air Pressure sensor (IAP) and it is there to measure the actual pressure in the manifold between the throttle butterflies and the intake valves. It needs to be hooked up to the hoses going to each throttle body.

Cracked or loose hoses to the IAP are another area to check for strange running problems.

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If you think reading is tricky, how the hell are you going to follow troubleshooting directions?
"Riding well is difficult, riding poorly is easy and painful."
- Nick Ienatsch


"We're all here because we're not all there" - Guy Favron on Gold Rush

K6 750
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