I changed my map sensor to a two bar for my turbo install and it looks identical to my stock sensor, how can I tell if I got the correct sensor?

The connector won't fit since it is keyed different, and your engine now runs for crap.

They keyway might be colored orange as shown below. You can also make out the keys of the 2 bar connector in this picture.

My connector fit right in, it was the same plug.

Look at the webbing on either side of the connector on the top side. Often times on either corner it will be stamped with a small number like 1.0 or 1.1. Some not all. My connector has an extra slit so it'll accept both MAP sensors so that isn't always dependable for differentiated between them.

Ok I'm looking at these two and both have the number 466 on top and the plugs are pinned the same. On the bottom the original has A1-15 and has a large ID on the vac line, the 2 bar has the number 9576-E 8 and a pin hole ID on the vac line. In the picture the alleged 2 bar is on the right,

Roger gives a description in this thread:

http://gafieroclub.org/bbs/index.php?topic=1199.0

The number I'm talking about is about 1/20 the size of the 466 you're looking at. It's very small and would be on the top of the sensor on either the left or right side corner of the top side of the plug where it joins to the body of the sensor, the small triangular corner if it has a number there at all.

quote Originally posted by JCircs: I changed my map sensor to a two bar for my turbo install and it looks identical to my stock sensor, how can I tell if I got the correct sensor?

Key on, Engine off, connector plugged into the MAP sensor - backprobe the center (Lt. GREEN) pin of the connector. Measure the voltage to engine ground.



If you get close to 4.7v your MAP is a 1 bar MAP sensor

If you get close to 2.3v your MAP is a 2 bar MAP sensor.

If you get a voltage in milivolts - your pin is not making connection with the metal terminal - push it in a bit farther.

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btw - both your MAP sensors still have the keyway in them. The keyways can fall out or just be missing. Since you said your connector fits in both I would assume both are keyed the same. If so it looks to me that you have two 1 BAR MAP sensors.

As aligned in your picture the 1 bar MAP sensor would have the keys on the top (12 o'clock) of pins A & C. The two bar MAP sensor would have it's keys at 6 on pin C (bottom pin) - 9 on pin B, and none on pin A (top pin) as per your picture

[This message has been edited by phonedawgz (edited 10-06-2012).]

Here's a helpful link:

http://www.robietherobot.com/storm/mapsensor.htm

460 or 466?

edit: Ohh, I think I see where you're getting the 466

[This message has been edited by slicknick (edited 10-06-2012).]

quote Originally posted by slicknick: Here's a helpful link: http://www.robietherobot.com/storm/mapsensor.htm 460 or 466? edit: Ohh, I think I see where you're getting the 466

GM part number for the large body 2 BAR MAP sensor is 2131520 (old P/N 12569241) The application is 87 Pontiac Sunbird with the 2.0L turbocharged engine. Beleive GN's also use this MAP.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

quote Originally posted by JCircs: Ok I'm looking at these two and both have the number 466 on top and the plugs are pinned the same. On the bottom the original has A1-15 and has a large ID on the vac line, the 2 bar has the number 9576-E 8 and a pin hole ID on the vac line. In the picture the alleged 2 bar is on the right,

Interesting thing to note, if you take a look at the link I posted with the Delphi drawings, is that your MAP sensor on the right isn't built to spec with the small hole on the vacuum line. So, the numbers on there might not be correct if it's some oddball chinese part and I'd consider just testing it as well.

[This message has been edited by slicknick (edited 10-06-2012).]

Here is the proper 2 BAR MAP plug. Notice one slit on the side? I had to cut my stock connector to fit my 2 BAR.

Lots of great and thoughtful posts on this thread. After reading all of them, I believe that jcircs was sent a cheap copy of a Delphi or AC Delco MAP sensor that could have been made to any specs. I doubt if the problem was the chip as darthfiero has been doing programming for quite some time.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

This is strange, My car is at the shop with the alleged 2 bar installed using the stock plug unmodified. Today while cleaning up the mess I tried putting the supplied plug from the 2 bar into the 1 bar that was removed from the car and it does not fit. So I might have received the correct plug with the wrong sensor, I have not yet tried the supplied plug with the 2 bar it came with but I will when I get it back.

quote Originally posted by JCircs: This is strange, My car is at the shop with the alleged 2 bar installed using the stock plug unmodified. Today while cleaning up the mess I tried putting the supplied plug from the 2 bar into the 1 bar that was removed from the car and it does not fit. So I might have received the correct plug with the wrong sensor, I have not yet tried the supplied plug with the 2 bar it came with but I will when I get it back.

If the new plug does not fit, it is almost certain that you received the wrong sensor but if the key insert is missing both plugs will fit. . If I am correct to make everything work right it will be a simple matter of plugging in a verified 2 BAR MAP. If you have a simple VOM (voltohmmeter) put the scale on 20V DC and back probe the center pin/wire of the plug as Phonedawgz has shown. That's a sure indicator.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

I now have the same problem! Purchased a supposed 2 BAR MAP and it fit with the stock connector and when I checked the voltage on both the original and new sensor, the voltage was 5 indicating by phonedawgz to be a 1 bar MAP. Any suggestions?

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Fieros......Gotta Love Em!

Dawn: My 86 GT!

NEED PARTS? I GOT EM!!

If a 2 bar is what you need there's only one thing you can do, send it back. Mine was a 2 bar after all and it did plug in with my original connector. My issues ended up being in the tune not in the sensor, fortunately its all worked out now.

So with all the symptoms that you had, did you wind up having a 2 bar, or was it actually a 1 bar?

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Fieros......Gotta Love Em!

Dawn: My 86 GT!

NEED PARTS? I GOT EM!!

Like I stated in my last post, the map sensor I purchased was a 2 bar and my original plug worked with it. All my issues were in the program that was put on my chip.