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Fuel mileage loss, fix = clean the Map Sensor again.

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C

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Discussion Starter · #1 ·
Fuel mileage loss, fix = clean the Map Sensor again.
I might just buy a couple of them and replace it every 12 months while cleaning every six months.
I have never had to do such a thing to any other vehicle I have owned. I have never owned a boosted car before.
Cheers.
 
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Discussion Starter · #3 · (Edited)
XtremeRevolution said:
Details? I wasn't aware this was an issue with our cars.

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I was having dropping fuel mileage before and pulled the map sensor to clean it, made a large difference especially on the low end.
This is the second time I have done this so I'm thinking I will just make it a 6 month service thing with me including replace every 12 months. It gets quite sooted up and I dont really do alot of regens.
Im actually surprised it makes such a large difference since its not meant to be cleaned or replaced so often.

Edit.
I have owned the car for less than 18 months.
 
obermd

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#4 ·
I think you're the first person I've heard having to do this. Are you using low-sulfur diesel from a reputable source?
 
C

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Discussion Starter · #7 · (Edited)
TheRealHip said:
Do you mean the MAF sensor?
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No I mean MAP Sensor, (SENSOR ASM-MAP), also known as Manifold Differential Pressure Sensor. ACDELCO OE SERVICE CANADA

The MAP sensor converts engine vacuum/manifold pressure to an electrical signal so the computer knows how much load the engine is under. This data is the basis for fuel delivery and timing control. The MAP sensor is typically located in the air cleaner, fender wall, firewall, intake manifold or under the dash.

I am of the opinion that the MAP sensor is extremely important for our engine especially if you have a light foot like me. People with a heavy foot will notice a much smaller difference to start with.

I am thinking the place where the MAP sits should have been designed a little better so the soot would flow away from it, so it does not soot load so fast.

 
Tomko

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Tomko

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Cruz15 said:
No I mean MAP Sensor, (SENSOR ASM-MAP), also known as Manifold Differential Pressure Sensor. ACDELCO OE SERVICE CANADA

The MAP sensor converts engine vacuum/manifold pressure to an electrical signal so the computer knows how much load the engine is under. This data is the basis for fuel delivery and timing control. The MAP sensor is typically located in the air cleaner, fender wall, firewall, intake manifold or under the dash.

I am of the opinion that the MAP sensor is extremely important for our engine especially if you have a light foot like me. People with a heavy foot will notice a much smaller difference to start with.

I am thinking the place where the MAP sits should have been designed a little better so the soot would flow away from it, so it does not soot load so fast.
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So where is it located on the LUZ engine?
 
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D

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#11 ·
Cruz15 said:
Fuel mileage loss, fix = clean the Map Sensor again.
I might just buy a couple of them and replace it every 12 months while cleaning every six months.
I have never had to do such a thing to any other vehicle I have owned. I have never owned a boosted car before.
Cheers.
Click to expand...
How much of a difference do you notice before and after?
 
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#14 ·
Did an oil change today. So I popped the top engine cover off. Removed 2 10mm bolts holding the bracket for the wiring, unhooked the wiring from the MAP sensor, and popped it out... Sensor is the one under the blue plug, disconnected


DISGUSTING. I used what was left of a can of Brake Kleen and reinstalled.



Now, since it has gotten cold, there's been a bit of a lag and low power in low RPM, low load situations. Kinda like going 35mph in 5th gear. It would take a half a heartbeat longer to downshift than when it gets warm. Since cleaning, there is definitely more low end torque. Cruising through town, no lagging.
 
BradHerr

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#15 ·
This is definitely an easy maintenance action. It would be hard to believe that the sensor functions at maximum effectiveness while covered in soot. The sensor sits just downstream from where the EGR pipe enters the intake manifold. I haven't monitored mine before and after the EGR delete to see if the sensor stays cleaner longer. I can do some research and check when I cleaned it last. Then tomorrow I will inspect it and report the findings.


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BradHerr

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#18 ·
According to google, this sensor is also the "Charged Air Temperature Sensor". If that is the case, a soot coated temp probe would react slower to temperature changes and cause improper fuel delivery. This could be some of the cause of the low power as well.


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