pipes under the intake tube?
04-01-12, 05:49 PM
#1
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pipes under the intake tube?
So, yesterday I was mounting some of the parts of my car's engine (Mazda RX-7 FC 13B NA, 1987) when I noticed this:
This is the bottom of the "tube" that goes from the MAF to the intake.
1-> Can anyone tell me what those "pipes" are for?
One of them is closed with a rubber cap but the other one is open, and that got me thinking:
2-> "Well, if that's open, then the air is going to enter throught there into to the intake... In that case, what's the air filter for?" and also:
3-> "Humm... If the air enters throught there, will the MAF be able to measure the air mass that goes into the intake correctly?" My guess: no!
Your help/information/opinion/point of view, much appreciated!
This is the bottom of the "tube" that goes from the MAF to the intake.
1-> Can anyone tell me what those "pipes" are for?
One of them is closed with a rubber cap but the other one is open, and that got me thinking:
2-> "Well, if that's open, then the air is going to enter throught there into to the intake... In that case, what's the air filter for?" and also:
3-> "Humm... If the air enters throught there, will the MAF be able to measure the air mass that goes into the intake correctly?" My guess: no!
Your help/information/opinion/point of view, much appreciated!
04-02-12, 09:36 AM
#4
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That picture is insanely dark. All I see is a silhouette.
From the shadow, I am guessing that it's the sub zero start squirter. Either just cap the nipple with a new vacuum cap, or remove it and install a blockoff plate. Mazda issued a TSB that the system is to be removed. Additionally, the sub zero reservoir is located on the firewall near the charcoal canister. Remove it as well.
From the shadow, I am guessing that it's the sub zero start squirter. Either just cap the nipple with a new vacuum cap, or remove it and install a blockoff plate. Mazda issued a TSB that the system is to be removed. Additionally, the sub zero reservoir is located on the firewall near the charcoal canister. Remove it as well.
04-02-12, 05:17 PM
#5
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Hello Aaron. Thank you for your answer.
I'm sorry for the picture being too dark, but althought it's dark, here on my computer and on the camera seems bright enough to understand. I think the computer screen you are using may need some setup.
I recommend you to visit this website:
http://www.quickgamma.de/indexen.html
and use their software (it's free) to correctly calibrate your computer screen so you can get the best of it.
Anyway, I've edited the picture to be brighter so you can see it better:
Did it help?
And yes, you may be right. It may be the sub zero start squirter, as you mentioned. I've searched the FSM, and on page 1-17 the diagram shows something marked with the letter 'A', but it doesn't have a description, so by looking to it one does understand that there is something in there, we just don't know what it is...
Since I bought the car and started working on it, I always wondered what was that white small tank on the firewall near that canister, with a green smelly liquid was for... Now, it's answered! 
So, you are telling me that I can remove this and cap that pipe? Does the FSM talk about this system?
I'm asking that so I can see what are the parts that I need to remove
I'm sorry for the picture being too dark, but althought it's dark, here on my computer and on the camera seems bright enough to understand. I think the computer screen you are using may need some setup.
I recommend you to visit this website:
http://www.quickgamma.de/indexen.html
and use their software (it's free) to correctly calibrate your computer screen so you can get the best of it.
Anyway, I've edited the picture to be brighter so you can see it better:
Did it help?
And yes, you may be right. It may be the sub zero start squirter, as you mentioned. I've searched the FSM, and on page 1-17 the diagram shows something marked with the letter 'A', but it doesn't have a description, so by looking to it one does understand that there is something in there, we just don't know what it is...
Since I bought the car and started working on it, I always wondered what was that white small tank on the firewall near that canister, with a green smelly liquid was for...
Now, it's answered! So, you are telling me that I can remove this and cap that pipe? Does the FSM talk about this system?
I'm asking that so I can see what are the parts that I need to remove
04-03-12, 08:55 AM
#6
Engine, Not Motor
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Haha, I'm sitting behind three monitors all perfectly calibrated as part of my day job is building websites and thus dealing with the graphics work associated.
I checked an old intake tube I had in the garage last night.
The big hole is for the BAC valve.
The little capped nipple is for the purge valve.
Now, being a Eurpoean FC I don't know if the purge nipple is used. You'd have to check the FSM for your car. The emissions system of the Euro FC is very similar to the GSL-SE, with some early SA mixed in.
I checked an old intake tube I had in the garage last night.
The big hole is for the BAC valve.
The little capped nipple is for the purge valve.
Now, being a Eurpoean FC I don't know if the purge nipple is used. You'd have to check the FSM for your car. The emissions system of the Euro FC is very similar to the GSL-SE, with some early SA mixed in.
04-03-12, 11:14 AM
#7
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Thread Starter
Are you talking about this purge valve?
So in that case, it has to be used, right?
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04-03-12, 11:38 AM
#8
On my S4 NA engine, the smaller nipple was capped from the factory (like the one in the pic). My car also never had the recalled subzero start system, which is what my guess would be based on its location. The large one connected to the BAC, as mentioned.
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