Anyone clean their MAF?
- Thread starter Jarola
- Start date
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Simpleman
Full Access Member
Not sure there is a MAF sensor on the Liberty. Chrysler usually uses a MAP sensor on there engines. Can`t really clean those though. only replace. There is an intake air sensor in the intake tube, but it does not need to be cleaned. But if you insist you can use a small tooth brush with some degreaser and then blow it off with air.
kb0nly
Full Access Member
No MAF on the Liberty, it has a MAP sensor. It's a Speed Density system, unlike most of the GM products i have owned with that damn picky MAF inline with the intake tube.
On those, just an FYI, some say they have cleaned them and it still worked, my experience with two faulty MAF's over the years is that cleaning them don't help, they just work for a day or two and die again as the computer recalibrates. Fought that for a while on the Montana we had, drove for a few days with the MAF unplugged until i could locate a replacement because it was bad and having it plugged in would cause stuttering under acceleration, and hesitation going up hills, etc. So i know what that's like.
MAF sensors work by measuring actual airflow into the engine.
MAP sensors work by inferring the airflow based on manifold vacuum, hence the name, which stands for Manifold Absolute Pressure. Which is kind of a misleading term because the manifold has a vacuum not pressure, but some geeky types would say it is a negative pressure.
On those, just an FYI, some say they have cleaned them and it still worked, my experience with two faulty MAF's over the years is that cleaning them don't help, they just work for a day or two and die again as the computer recalibrates. Fought that for a while on the Montana we had, drove for a few days with the MAF unplugged until i could locate a replacement because it was bad and having it plugged in would cause stuttering under acceleration, and hesitation going up hills, etc. So i know what that's like.
MAF sensors work by measuring actual airflow into the engine.
MAP sensors work by inferring the airflow based on manifold vacuum, hence the name, which stands for Manifold Absolute Pressure. Which is kind of a misleading term because the manifold has a vacuum not pressure, but some geeky types would say it is a negative pressure.
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Redbone
Full Access Member
Only an "expert" can clean a MAF is my experience. I tried cleaning a couple. EVERYTHING ruins them. Every cleaner. Every brush.
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Herbalaire Vaporizer
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Herbalaire Vaporizer
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i have sucessfully cleaned them in the past...
the actual sensor part is very fine coiled wire that must be handled very gently. just unplug from the harness and remove the unit from the maf assembly. then carefully spray it with electronics cleaner and let it dry for an hour before you put it back together. it looks sorta like alightbulb filament. never touch it or try to brush it. the honeycomb part can be cleaned also but its the wire that does all the work.
the actual sensor part is very fine coiled wire that must be handled very gently. just unplug from the harness and remove the unit from the maf assembly. then carefully spray it with electronics cleaner and let it dry for an hour before you put it back together. it looks sorta like alightbulb filament. never touch it or try to brush it. the honeycomb part can be cleaned also but its the wire that does all the work.
Powerslave
Banned
The MAF on my Van was sealed, so all that could be cleaned was the flap, joints, and screen.
MAP = Manifold Absolute Pressure. That's what the Liberty has. The air in the atmosphere contains oxygen. An engine burns a mixture of oxygen and fuel. For an engine to burn efficiently, it has to have just the right mixture of fuel and oxygen.
To determine the correct air/fuel mixture and the correct ignition timing, the PCM must know the atmospheric (BARO) pressure. If the PCM is to compensate for changes in altitude or weather, it must have an input signal that reflects these changes in atmospheric pressure.
The Manifold Absolute Pressure sensor does this?
Yes. And, on engines that do not have a Mass Air Flow (MAF) sensor, the MAP sensor signal is also used by the PCM to calculate engine load -- how hard the engine is working. This is called the speed-density method of calculating engine load for engines without MAF sensors (as stated by someone above). It is because of this engine load calculation for speed-density engines that the accuracy of the MAP sensor signal is so critical.
The problem is, they are placed in a HOT intake manifold, so the accuracy is not perfect, but works with the system at hand. It would take a $1000.00 system to be as accurate as possible. Sometimes the IATs are also placed too close to the hot manifold, it's not accurate but WORKs with the system at hand. I move mine as close to the filter as I can get them, it's more accurate there.
MAP = Manifold Absolute Pressure. That's what the Liberty has. The air in the atmosphere contains oxygen. An engine burns a mixture of oxygen and fuel. For an engine to burn efficiently, it has to have just the right mixture of fuel and oxygen.
To determine the correct air/fuel mixture and the correct ignition timing, the PCM must know the atmospheric (BARO) pressure. If the PCM is to compensate for changes in altitude or weather, it must have an input signal that reflects these changes in atmospheric pressure.
The Manifold Absolute Pressure sensor does this?
Yes. And, on engines that do not have a Mass Air Flow (MAF) sensor, the MAP sensor signal is also used by the PCM to calculate engine load -- how hard the engine is working. This is called the speed-density method of calculating engine load for engines without MAF sensors (as stated by someone above). It is because of this engine load calculation for speed-density engines that the accuracy of the MAP sensor signal is so critical.
The problem is, they are placed in a HOT intake manifold, so the accuracy is not perfect, but works with the system at hand. It would take a $1000.00 system to be as accurate as possible. Sometimes the IATs are also placed too close to the hot manifold, it's not accurate but WORKs with the system at hand. I move mine as close to the filter as I can get them, it's more accurate there.
ATXKJ
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The CRD has a MAF sensor - don't think anyone has cleaned one - seems that if you disconnect it - the EGR stops working..... darn.......
(it also has a MAP sensor that has to be cleaned to keep Turbo response up - any generic solvent - brake cleaner to plain diesel works - just cleaning 1/2 burned oil)
(it also has a MAP sensor that has to be cleaned to keep Turbo response up - any generic solvent - brake cleaner to plain diesel works - just cleaning 1/2 burned oil)
