Author Topic: MAP sensor  (Read 5099 times)

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Offline aminga

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Re: MAP sensor
« Reply #15 on: July 15 2018, 03:56:14 PM »
I think you were on the right track to check the map output.  You did check the line from the sensor (vacuum) to make sure it is not cracked or broken?

Here's a link that shows voltages for a 3 bar  http://injector-rehab.com/shop/mapsensor.html
it's about 4.9/3 at atmospheric pressure or 1.6V
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Offline daveismissing

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Re: MAP sensor
« Reply #16 on: July 15 2018, 05:10:48 PM »
Unplug the compressor and blow it down to 30psi.  Then hook it to the MAP.

Earl...didn't Bison do a test on those with different brands?
https://turbobuick.com/threads/failed-3-bar-map-sensor-my-upgrade.451242/#post-3758619
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Offline Shimy87

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Re: MAP sensor
« Reply #17 on: July 16 2018, 03:59:56 PM »
Well with 0 pressure to it green wire read .25 volts. With 30 and then 40 lbs put to it no change...const ant .25....im thinking I need a new map
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Offline Steve Wood

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Re: MAP sensor
« Reply #18 on: July 16 2018, 04:47:43 PM »
sure sounds like it.  The GM sensor, if real, is the only factory style that I would buy and I suspect if they are coming from China, they are not worth it.  You could try one from Julio as he claims his are the real deal.

I guess the SSI technologies P51 pressure sensor is supposed to be the creme de la creme.  I think Bison is selling a 3.5bar version that he uses. Bout $150 each but is probably worth it if it saves you an engine
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Offline Steve Wood

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Re: MAP sensor
« Reply #19 on: July 16 2018, 04:53:08 PM »
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Shimy87

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Re: MAP sensor
« Reply #20 on: July 16 2018, 05:25:10 PM »
Called Julio to order one...we talked about it and he had me test it a different way...its good....he walked me through more tests and it turned out to be the factory boost gauge shorting it....eliminat ed that connection as I don't need it anyway and bingo!!  Just wanted to update if anyone searches for this problem they could check that.  Thanks guys!!
87 GN, K&N cold air, gutted cat, TT 5.7 chip, AFPR, 340 Walbro w/ hotwire, 60 LBS injectors, 981 valve springs, 206/206 Cam, RJC Powerplate, LS1 MAF & translator, Vacuum brakes, Hellwig rear sway bar, Energy suspension poly bushings, Razors Alky, Pypes exhaust, 5931 turbo, CK9.5 converter

Offline Steve Wood

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Re: MAP sensor
« Reply #21 on: July 16 2018, 07:02:21 PM »
good news
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

 

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