300ZX (Z31) Forums Dedicated to 84-89 ZCars otherwize known as the Z31's

Boost Sensor?

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Old Nov 25, 2008 | 08:22 PM
  #1  
Zetto's Avatar
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Boost Sensor?

ok, i don't know wtf the damn thing is really, all i know is that it's on the driver side fender in the engine bay and it says boost sensor on it. it has two plug ins on it and if they're disconnected while she's running she bogs down and idles like ****. but if it's unplugged and she's not started she won't start...at all. i've seen alot of Zs without this and was wondering what this is exactly, what it does, and how can i take it off. it also has i'm guessing vacumm lines on it and other air lines on it. thanks guys.
Old Nov 25, 2008 | 08:33 PM
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A boost sensor well... "senses boost" (and vacuum). It is the sensor for the boost gauge, and may be for the ecu as well (you can check the FSM for the answer). Replace it if it isn't working correctly.
Old Nov 25, 2008 | 08:37 PM
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It's for the gauge on the dash. Nothing else.
Old Nov 25, 2008 | 10:10 PM
  #4  
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yeah, but when i disconnect it the car runs something awful. and it works fine. i just want it off lol. FSM? is there a way to...i guess take it off the ecu. i'm guessing program the ecu? i have no experience with this stuff lol
Old Nov 25, 2008 | 10:17 PM
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dude, the boost sensor has nothing to do with ECU, if you are playing with the wires and getting odd results, i would check that part of the harness and check the coil wiring, then check the local grounds..
Old Nov 25, 2008 | 11:19 PM
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i'm not playing with the wires. but i want to know why my car runs like it's about to die when i disconnect it. and how would i take it off?
Old Nov 26, 2008 | 07:22 AM
  #7  
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You take it off by disconnecting and removing it. But I'm almost positive there are no wires that lead from it to the ECU.
Old Nov 26, 2008 | 10:15 AM
  #8  
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well then why does she run horrible? like she's about to die? and if they're disconnected she wont even start.
Old Nov 26, 2008 | 01:11 PM
  #9  
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Okay... getting to the bottom of this...

Originally Posted by Zetto
it has two plug ins on it
Maybe you could post a pic? The boost sensor should only have one plug on it (from what I remember). The other plug may be for something else.

Originally Posted by Zetto
and if they're disconnected while she's running she bogs down and idles like ****. but if it's unplugged and she's not started she won't start...at all.
If it runs fine plugged in, and doesn't while unplugged... what is the problem? Leave it plugged in and the car is happy. You want a happy car don't you?

Originally Posted by Zetto
i've seen alot of Zs without this and was wondering what this is exactly, what it does, and how can i take it off. it also has i'm guessing vacumm lines on it and other air lines on it. thanks guys.
"A lot of Z's without this" ? Maybe they weren't the turbocharged model?
Old Nov 26, 2008 | 02:24 PM
  #10  
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Are you unplugging the vacuum line as well? If so, that will be a part of it. These cars are very susceptible to problems if they have vacuum leaks.
Old Nov 26, 2008 | 08:52 PM
  #11  
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well the vacumm hose doesn't even do anything!! idk...and yeah, every one i've seen without it was turbocharged. my year even! and yeah, i want my car happy lol but i do plan on replacing the boost gauge (which i've never done) so...yeah
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