http://www.rx7turboturbo.com/robrob...kplug_wires.htm

 

http://www.rx7turboturbo.com/robrobi...plug_wires.htm

http://www.rx7turboturbo.com/robrobi...plug_wires.htm

Don't know happend the 1st time.

 

Check to make sure the vaccuum hose on the bottom of the object just showing on the far right side of the frame is connected. It's bolted to the firewall, has a small air filter on it and if I remember correctly this is an expensive little bastard - I forgot the name! (early Alzheimers) Easy to knock off when you are working in that area.

 

Bad link, bud.

Was this the one you were going for?
http://www.rx7turboturbo.com/robrobi...plug_wires.htm

If the MAP sensor is the same thing as the Barometric Pressure Sensor, I think its the partial black box you can see at about 2 o'clock of the oil filter. My car isn't here right now, but I think that's the component that has a sticker which says Boost Sensor on it - could be WAY wrong tho.

 

You are right. It is officially know as the "Pressure Sensor". Sends a signal to the ECU. I think MAP stands for Maximum Altitude Pressure which is the same durned thang........ BTW, don't ever damage that little bastard, they are about $400.00 to replace. I always take it off and put in on the dashboard for safekeeping when working in that area.

 

Can't you get a 2bar sensor from Apexi for something like 130?
~Tom

 

Correct on ID on the MAP sensor - small black box there. The vacuum hose there is an excellent candidate for a silicon hose/tie-wrap - can be a real pain if it pops off......

Minor correction - MAP Sensor = Manifold Absolute Pressure Sensor.

Other cars, such as Turbo-Supras, have a MAF (Manifold Air Flow) sensor instead.

 

Just another detail: The barometric pressure sensor is NOT the same as the MAP sensor. The barometric sensor is actually built in to the ECU.
MP

 

Found that MAP senor...and a bare nipple...thanks!

 

just if anyone wanted to see one

 

Can and how does this sensor go bad?

 

the map sensor isn't 400 dollars, maybe new but i just got one for 40 bucks ...

 

Yes it can go bad and the car won't boost. I have this situation now and i am still looking to find one. Brand new is around $400.

 

wtf would you buy a brand new one for then ? well whatever not my money

 

Spend another $400 + $30 and get yourslef a Power FC, $800, and a GM 3 bar Map Sensor for $30.00

 

Another minor correction... MAF = Mass Air Flow.

The Supra also has a MAP sensor, but instead of a speed density fuel delivery system (based on intake air temperature, engine rpm, and intake manifold pressure only) like the RX-7, the Supra's MAF sensor measures the volume of incoming air by monitoring how much voltage is required to keep the element of the MAF sensor at a constant temperature as the air passing by cools it. Fuel is added based on this data. That is why Supras can compensate for a significant change in the amount of air being ingested by the engine without requiring reprogramming or replacement of the ECU.

The downside is that if you blow off an intercooler hose, the car won't run for ****, because the computer thinks the engine is getting a lot more air than it really is and adds fuel to compensate. This produces a nice black cloud of unburned fuel, and you have to limp the car to the nearest tool box to take care of the problem. I carried a 10mm wrench in my Supra just in case. The RX-7, on the other hand, can run in "naturally aspirated" mode if absolutely necessary.

 

since we are doing minor corrections jim you forgot the engine coolant temp sensor. another important one as it helps decide open/closed loop

 

Then you might as well mention the 02 sensor if you're going to bring open vs. closed loop into the discussion.

 

Again splitting hairs, it stands for Mean Atmospheric Pressure (sensor). Trust me on this one.

 

hmmm I agree with jimlab.... it's mass air flow. Should we have a post???

 

No thanks, unless you can provide some proof other than your opinion.

"manifold absolute pressure sensor" returns 923 results on Google.
"mean atmospheric pressure sensor" returns... zip.

 

I have never heard that before. The documentation for every speed-density type ECU that I've ever played with very clearly states that the MAP sensor is the "Manifold Absolute Pressure" sensor.

It is hair splitting, but let's hear your source on this one.

Sonny