# Boost/Vacuum on a KA24DE reading : not happening
**URL:** https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320
**Category:** SON240sx Automotive
**Created:** [November 30, 2003, 1:10pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320 "2003-11-30T13:10:41Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Gonad](https://forums.speedlife.net/u/Gonad)
#### Post date: [November 30, 2003, 1:10pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/1 "2003-11-30T13:10:41Z")
Ok, I tried the vacuum line on the carbon canister and I couldn’t get a
vacuum reading on my boost/vac gauge, nor could I feel any kind of
suction from that hose. What’s going on?
I also tried the A.I.V. hose and I couldn’t feel any vacuum or a reading
on my gauge.
I’m confused. Am I going about this all wrong? :dunno:
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### Author:  [@dnash](https://forums.speedlife.net/u/dnash)
#### Post date: [November 30, 2003, 1:22pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/2 "2003-11-30T13:22:45Z")
Maybe the gauge itself is broken?
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [November 30, 2003, 1:26pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/3 "2003-11-30T13:26:58Z")
Those two lines you taped into are controlled by an electronic solenoid.
They will only supply a vacuum during certain instances.
You need to find a constant vacuum source.
Use something after the Throttle Body near the throttle body.
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [November 30, 2003, 1:28pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/4 "2003-11-30T13:28:28Z")
The best way to find a constant vaccum is while the engine is runing start pulling lines.
When you pull one that affects the engines idle and possibly stalls the car then use that one. 😛
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### Author:  [@Gonad](https://forums.speedlife.net/u/Gonad)
#### Post date: [November 30, 2003, 1:31pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/5 "2003-11-30T13:31:54Z")
Well the gauge isn’t broken; I blew/sucked on it (as gross at it sounds)
and the needle moves. I’m sure it’s not the gauge.
Anywho, I’ll try what Adam says…will have to try tomorrow or tue… ☹
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### Author:  [@Racer\_XTREME](https://forums.speedlife.net/u/Racer_XTREME)
#### Post date: [November 30, 2003, 10:34pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/6 "2003-11-30T22:34:55Z")
the one you tee into on the SR is from the throttle body opening to the fuel pressure regulator.
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [December 1, 2003, 8:10am UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/7 "2003-12-01T08:10:28Z")
^^^ Any constant vaccum after the Throttle Body will work.
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### Author:  [@Gonad](https://forums.speedlife.net/u/Gonad)
#### Post date: [December 1, 2003, 1:25pm UTC](https://forums.speedlife.net/t/boost-vacuum-on-a-ka24de-reading-not-happening/80320/8 "2003-12-01T13:25:24Z")
I’m gonna try the vacuum line on the Fuel Pressure regulator. According
to the FSM, there should be vacuum at idle and deceleration I believe.