« previous next »
Pages: [1] 2   Go Down

Author Topic: MAP sensor  (Read 6232 times)

0 Members and 1 Guest are viewing this topic.

Offline Shimy87

  • Turbo Street Eliminator
  • ******
  • Posts: 1248
  • PSI: 2
    • View Profile
MAP sensor
« on: July 14 2018, 11:30:15 AM »
My alky won't activate under boost but test button works fine. Have 5.06 volts on grey wire at MAP....green wire has .09 volts. Question is when I blow hard in tube going to map voltage on green wire dosent change....it should unless a person can't blow hard enough to make it change??
Logged
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 earlbrown

  • Turbo Street Eliminator
  • ******
  • Posts: 1571
  • PSI: 6
    • View Profile
Re: MAP sensor
« Reply #1 on: July 14 2018, 11:41:33 AM »
If you can blow hard enough to make it change, I have a new and exciting field of work for you!
Logged
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9950
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: MAP sensor
« Reply #2 on: July 14 2018, 11:48:58 AM »
LOL  yeah, you need a bit more air pressure
Logged
Steve Wood

http://www.vortexbuicks-etc.com

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

Offline Shimy87

  • Turbo Street Eliminator
  • ******
  • Posts: 1248
  • PSI: 2
    • View Profile
Re: MAP sensor
« Reply #3 on: July 14 2018, 11:50:44 AM »
Ha ha. Ok thanks...i didn't know.
Logged
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 aminga

  • Chicks Dig the Power Bulge
  • Turbo Street Limited
  • ***
  • Posts: 151
  • PSI: 0
  • Chicks Dig the Power Bulge
    • View Profile
Re: MAP sensor
« Reply #4 on: July 14 2018, 07:43:46 PM »
It should have some voltage at atmospheric
Logged
86 Regal T-type. One Owner. Twisted 6 Racing Built 109, FTSS Revolution X 206/210 Cam, T&D 1.65 Rockers, Diamond Forged Pistons, RJC Power Plate, TA6262DBB, PTE SLIC, Alkycontrol pump and Kit and ISAC Controller, Bailey TR6 Wastespark, TA Headers, ATR Downpipe, Racetronix Walbro pump and hot wire ki

Offline daveismissing

  • Two Buicks- too little money$$
  • Turbo Street Outlaw
  • *******
  • Posts: 6517
  • PSI: 3
  • Two Buicks- too little money$$
    • View Profile
Re: MAP sensor
« Reply #5 on: July 14 2018, 08:05:57 PM »
Assuming stock 2Bar MAP

 
Manifold Pressure2 Bar
(relative sea level / absolute)
MAP Output
14.31psi / 29.01psi4.90V
14.00psi / 28.70psi4.84V
13.00psi / 27.70psi4.67V
12.00psi / 26.70psi4.50V
11.00psi / 25.70psi4.33V
10.00psi / 24.70psi4.16V
9.00psi / 23.70psi3.99V
8.00psi / 22.70psi3.82V
6.00psi / 20.70psi3.47V
4.00psi / 18.70psi3.13V
2.00psi / 16.70psi2.79V
0.00psi / 14.70psi2.45V
5.00inHg / 12.24psi2.03V
10.00inHg / 9.78psi1.61V
15.00inHg / 7.33psi1.19V
20.00inHg / 4.87psi0.77V
25.00inHg / 2.41psi0.35V
29.10inHg / 0.40psi0.02V
Logged
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline Steve Wood

  • Turbo Street Outlaw
  • *******
  • Posts: 9950
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: MAP sensor
« Reply #6 on: July 14 2018, 08:16:28 PM »
he has a 3 bar sensor so give him the table for that
Logged
Steve Wood

http://www.vortexbuicks-etc.com

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

Offline Shimy87

  • Turbo Street Eliminator
  • ******
  • Posts: 1248
  • PSI: 2
    • View Profile
Re: MAP sensor
« Reply #7 on: July 14 2018, 08:29:25 PM »
Worked fine....stoppe d for a beer and quit.....every thing seems in order so I'm stumped...will be calling julio....any ideas??
Logged
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

  • Turbo Street Outlaw
  • *******
  • Posts: 9950
  • PSI: 34
    • View Profile
    • http://www.vortexbuicks-etc.com/
Re: MAP sensor
« Reply #8 on: July 14 2018, 08:38:09 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
Logged
Steve Wood

http://www.vortexbuicks-etc.com

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

Offline daveismissing

  • Two Buicks- too little money$$
  • Turbo Street Outlaw
  • *******
  • Posts: 6517
  • PSI: 3
  • Two Buicks- too little money$$
    • View Profile
Re: MAP sensor
« Reply #9 on: July 14 2018, 09:30:04 PM »
A 2 Bar should be around 5volts at 30 lbs, a 3bar 5v at 45lbs. Got a compressor with a regulator that turns way down?
jury rig connection to tire pressure?
EDIT ;absolute numbers so subtract 14.7
« Last Edit: July 14 2018, 10:20:25 PM by daveismissing »
Logged
-Drain plug by Earl Brown, custom oil pan by Rich's Auto

Offline good2win22

  • Turbo Street Outlaw
  • *******
  • Posts: 2019
  • PSI: 0
  • No man lives happily lest he remove the boredom
    • View Profile
Re: MAP sensor
« Reply #10 on: July 15 2018, 09:13:35 AM »
I used my oxy-acetelyne rig to calibrate the MAP table.  Gauge is a little easier to read at those low pressures
Logged
Jason

1966 Ford Ranch Wagon
1982 Jeep Wagoneer Limited
1986 Grand National BLK PHNX
1987 Turbo Regal Limited
2018 Ram 2500 Cummins

Offline Shimy87

  • Turbo Street Eliminator
  • ******
  • Posts: 1248
  • PSI: 2
    • View Profile
Re: MAP sensor
« Reply #11 on: July 15 2018, 11:24:39 AM »
Thanks guys...yes line is good so I gotta figure out a way to put regulated air to it to test. My compressor regulator is shot so it's to much. Gives me a reason to replace it now I guess :icon_eyes:
Logged
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 earlbrown

  • Turbo Street Eliminator
  • ******
  • Posts: 1571
  • PSI: 6
    • View Profile
Re: MAP sensor
« Reply #12 on: July 15 2018, 01:32:22 PM »
Unplug the compressor and blow it down to 30psi.  Then hook it to the MAP.
Logged
'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Scoobum

  • Turbo Street Outlaw
  • *******
  • Posts: 5599
  • PSI: 3
  • RED-RETIRED EXTREMELY DANGEROUS
    • View Profile
Re: MAP sensor
« Reply #13 on: July 15 2018, 01:50:20 PM »
Quote from: earlbrown on July 15 2018, 01:32:22 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?
Logged
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline Shimy87

  • Turbo Street Eliminator
  • ******
  • Posts: 1248
  • PSI: 2
    • View Profile
Re: MAP sensor
« Reply #14 on: July 15 2018, 02:26:12 PM »
The gm one is $100....dont want to get a cheap one and have another issue. Will be testing it tomorrow
Logged
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
Pages: [1] 2   Go Up
« previous next »
 
SimplePortal 2.3.7 © 2008-2024, SimplePortal