I know there is a boost sensor on an N/A, and my question is.....
I ahev removed the A/P and ACV, and now the vacuum line that goes to the boost sensor is blocked off because of the lack of ACV. (Just a plate covering the hole) The car seems to run just fine (a lot better actually) Do I need input from that sensor? Should I tee the line into another vacuum line or something??
Is my car going to turn into a cataclysmic fireball, or worse yet, a Honda?

(Oh, I posted this in 2nd gen forum too... sorry, I just need a reply soon!)

 

This is not a knowledgable answer, just a reply: It has become my understanding that the pressure or boost sensor worked with the ecu(air flow, rpm etc) to determine the fuel flow. If the boost sensor fails or is disconnected, then the ECU falls back to a *fail safe* mode. I don't know that to be a fact, and I'm sure you won't take it as such, but will some kind soul please straighten this out. Please reply. NOW, TO THE TOP, BUMP.

 

Ya, there are too many people that don't really know what the boost sensor excactly does in the NA...We need someone to enlighten everyone!!! I know other people will be interested in knowing... Waitin'.....
Oh.. If the ECU thought the sensor was malfonctioning, wouldn't a code come up on the check engine light? It is still hooked up electronically, it's just not getting an air pressure/vacuum signal.
I am going to become a mennonite. Horses don't have boost sensors.

 

On the 87n/a I just pulled the vac line and plugged it. Drove full throttle in first and second. Could'nt tell the difference. No code lites on. I''m sure a good fuel system must need to know what the vaccum is or boost pressure in the intake to make a good fuel ratio. If it fails there just has to be a default it goes to and just depend on the rest of the sensors to do their job. Something like that I'm sure.

 

Here is a very good explanation http://www.howstuffworks.com/fuel-injection.htm it talks about the pressure sensor there. Also look at *engine controls and performance chips* on the same thread . Thats even more interesting.

 

I would think we're talking about 2 seperate things. The N/As have a pressure sensor and the TIIs have boost sensor. On a N/A the ecu only checks the pressure sensor 1 once on startup. Because the air density varies with altitude and chances are your not driving through places with great differences in altitude so it only checks it once. On a turbo, the ecu constantly checks the boost sensor cause it has to know how much pressure the turbo is feeding into the engine.

 

Thanks for the input guys... I am guessing from th answers that the pressure sensor really doesn't do squat on an N/A.....
I guess I'll still tee it into a vacuum line to make it safe.....

 

Cameljoe....I'll keep an open mind, but, there is another sensor located in the interior, passengers side, called the atp or atmospheric pressure sensor that does what its name implies. That http://www.howstuffworks.com under how fuel injection systems work, has a sub article on engine controls and performance chips, that says the pressure sensor is used to determine how hard the engine is working so it can use that information to increase of decrease the pulse width of the injector. Could be wrong, but thats what I got out of the article.

 

Your right. Its MAP sensor. I would just tee the vacuum line. That sensor is pretty important to the ECU.

 

Cameljoe.....I've gotta start watching it. I only have 87 and under cars and I forget sometimes what car the poster has. Best I know I don't have a map sensor. I assume its the same as the pressure sensor(boost?) on my 87 r/h strut tower. Oh, and another thing. This morning I took the 87n/a out with the vac hose off the boost(pressure) sensor, and it ran substandard to say the least. The nite before I just took it around the block a couple of times and did'nt really notice a difference, but out on the hwy this morn, its readily apparent that things are not right. BamBam had decided to keep it already so I did not say anything today until now. That line off the pressure sensor also really screws up the relief solenoid pretty bad also. Keeps it open almost constantly, relieving.