MASS Air Sensor question
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MASS Air Sensor question
A while back I upgraded my 92 F150, 351W from SD to MASS Air. Along the way I also rebuilt a motor and everything is running fine.
I am using a stock MASS Air sensor housing - https://i.imgur.com/KTkAC.jpg
That has no calibration tube. I am also using stock injectors.
I have a 76 mm MASS Air sensor housing that I installed today along with a gold calibration tube (which I was told would work for me). As soon as I installed that, the motor barely stays running, hovers at less than 500 RPM, and needs to catch up after I press the gas. I know the tube can be affected by the air filter, I have sort of a conical filter but it could be thought of as just round as well - https://i.imgur.com/U7Uzg.jpg
(the orange Air Adjuster unit is not plugged in now).
What I don't know is what calibration tube would work with my system. The place I ordered it from doesn't know so I am hoping someone could tell me and I could get that one? Or is there some other setting or adjustment I could do (set the timing???) that may resolve this?
Thanks.
I am using a stock MASS Air sensor housing - https://i.imgur.com/KTkAC.jpg
That has no calibration tube. I am also using stock injectors.
I have a 76 mm MASS Air sensor housing that I installed today along with a gold calibration tube (which I was told would work for me). As soon as I installed that, the motor barely stays running, hovers at less than 500 RPM, and needs to catch up after I press the gas. I know the tube can be affected by the air filter, I have sort of a conical filter but it could be thought of as just round as well - https://i.imgur.com/U7Uzg.jpg
(the orange Air Adjuster unit is not plugged in now).
What I don't know is what calibration tube would work with my system. The place I ordered it from doesn't know so I am hoping someone could tell me and I could get that one? Or is there some other setting or adjustment I could do (set the timing???) that may resolve this?
Thanks.
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I'm using the gold tube:
76mm Unit on 1986-1993 5.0 Mustangs
19lb Injectors Gold Tube (096)
from here: C&L Calibration Tube Chart
To me it looks yellow but there isn't a yellow, so it's gold.
76mm Unit on 1986-1993 5.0 Mustangs
19lb Injectors Gold Tube (096)
from here: C&L Calibration Tube Chart
To me it looks yellow but there isn't a yellow, so it's gold.
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Turbulence & Mass Air Sensors
How close to the sensor itself is the air actually entering the filter? About 1 foot?
I have known turbulence in the air flow to adversely affect mass air operation; that's one reason Ford has those gosh-awful long hoses and such leading to the mass air, maybe.
Try attaching a fat enough length of tubing, could be anything, for temporary, maybe 2 feet long or more, for the air to flow through before entering the sensor; see if any difference. These electronics like what is called "laminar flow".
impish
I have known turbulence in the air flow to adversely affect mass air operation; that's one reason Ford has those gosh-awful long hoses and such leading to the mass air, maybe.
Try attaching a fat enough length of tubing, could be anything, for temporary, maybe 2 feet long or more, for the air to flow through before entering the sensor; see if any difference. These electronics like what is called "laminar flow".
impish
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How close to the sensor itself is the air actually entering the filter? About 1 foot?
I have known turbulence in the air flow to adversely affect mass air operation; that's one reason Ford has those gosh-awful long hoses and such leading to the mass air, maybe.
Try attaching a fat enough length of tubing, could be anything, for temporary, maybe 2 feet long or more, for the air to flow through before entering the sensor; see if any difference. These electronics like what is called "laminar flow".
impish
I have known turbulence in the air flow to adversely affect mass air operation; that's one reason Ford has those gosh-awful long hoses and such leading to the mass air, maybe.
Try attaching a fat enough length of tubing, could be anything, for temporary, maybe 2 feet long or more, for the air to flow through before entering the sensor; see if any difference. These electronics like what is called "laminar flow".
impish
As best as I can tell, the sensor is 11" from the top of the filter.
That makes me have a question...you can barely tell in this picture - https://i.imgur.com/KTkAC.jpg
that there is a screen in the intake side of the housing. This is between the filter and sensor. The new housing I have doesn't have a screen and I wonder if that diffuses any turbulence enough with the other housing (the one that worked) where I don't get this problem?
I'll try removing the filter and putting a 2 foot length of tubing in place tomorrow.
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I've seen 'em both with and without screens. Undoubtedly, a screen likely "strains" the air flow down to a better quality; but I think the purpose is more to catch s**t that gets by the filter, maybe pieces of bugs, etc.
Maybe try sticking a piece of screen in there; it couldn't hurt! impish
Edit: Guess **** is a naughty word? What, this is a Brit. forum??
Maybe try sticking a piece of screen in there; it couldn't hurt! impish
Edit: Guess **** is a naughty word? What, this is a Brit. forum??
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The screen in between the air filter and sensor didn't make any difference. But I removed the air filter and put on ~2 feet of tubing before the sensor and that seemed to stabilize things out just fine - https://i.imgur.com/0t0BI.jpg
So I now know more about the system but I still don't understand what my options are from this point. I'd really like to keep my air filter setup where I have it now, would a different (size and/or shape) filter work? Or do I just have the sensor too close and need to move it?
So I now know more about the system but I still don't understand what my options are from this point. I'd really like to keep my air filter setup where I have it now, would a different (size and/or shape) filter work? Or do I just have the sensor too close and need to move it?
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Sorry, not entirely sure what you are asking...I don't think I have a bypass valve. Essentially I am working with this setup - https://i.imgur.com/U7Uzg.jpg
that air hose goes straight into the throttle body with no other valves or sensors between the air filter and throttle body.
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From: Calhoun GA
I was looking at your sig. Most supercharged applications have a bypass valve around the blower that discharge after the air meter. Some aftermarket air meters are sensitive to turbulence which can be caused by the bypass air discharging too close to the air meter.
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Ah yes. Same truck but blower not on there because it's a new motor
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OK, thanks for the info...I'll need to get the TwEECer to do that. Not a bad thing as I had already planned on it.
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Could you suggest the best place for me to read up on that?