What size is MAF/MAS for a '95

[Rob Slade]

Like the subject says, what size is the stock Mass air flow sensor on a 1995 explorer with the OHC push rod V-6 engine?

 

[Jason_25]

Originally posted by Rob Slade
Like the subject says, what size is the stock Mass air flow sensor on a 1995 explorer with the OHC push rod V-6 engine?

It's actually the OHV engine. Well not sure on the size of the MAF but I'm pretty sure no one makes an aftermarket one unfortunately.

 

[Rob Slade]

Well, I have the chance to put the MAF sensor from a 5.0 liter V8 engine on my X and was wondering if it was bigger than the stock one, so I need to know what size the stock one is.

 

[Jason_25]

Yeah I'm pretty sure it's larger than the stock one. I actually posted a question like yours a couple weeks ago. The answer I got was that even though it may fit, it will not work correctly because individual MAF's are programmed to work with their specific engine. Apparently the engine computer does not have MAF data stored in it and all the decisions it makes comes from the electronics within the MAF. But by all means PLEASE TRY!!! There is a chance they could be wrong and the engine computer could adapt to the new MAF and it would work!

 

[Rob Slade]

I am going to try and use the stock computer sensor and just swap the MAF tube. I'll keep everyone posted.

 

[Jason_25]

Great idea man, never thought about that. Please do keep us posted.

 

[Sport (no trac)]

Be careful with this one. A couple of things can happen, but if the check engine light comes on, shut the engine down and put the old one back in.

What is likely to happen is the computer will see that the MAF is faulty and will run the engine in WOT mode. To prevent against what it predicts as a number of possible major engine malfunctions, the computer will dump extra gas in to the mix, retard timing and although it will feel like it is pulling strongly, it is in self-defense mode. The extra fuel, if run for long enough, will wash the cylinders of oil causing scuffing, the engine may backfire, and you may burn out the cats.

There is a very good chance the computer will not jive with the MAF. The computer takes input from the MAS and expects the readings to be sent based on a certain calibration. The MAS is calibrated to work with a certain sized engine with a specific injector size.

 

[Jason_25]

Originally posted by Sport (no trac)
Be careful with this one. A couple of things can happen, but if the check engine light comes on, shut the engine down and put the old one back in.

What is likely to happen is the computer will see that the MAF is faulty and will run the engine in WOT mode. To prevent against what it predicts as a number of possible major engine malfunctions, the computer will dump extra gas in to the mix, retard timing and although it will feel like it is pulling strongly, it is in self-defense mode. The extra fuel, if run for long enough, will wash the cylinders of oil causing scuffing, the engine may backfire, and you may burn out the cats.

There is a very good chance the computer will not jive with the MAF. The computer takes input from the MAS and expects the readings to be sent based on a certain calibration. The MAS is calibrated to work with a certain sized engine with a specific injector size.

Yep that's what I thought. Thanks man, but see he still may be able to keep his stock MAF and just swap the housing which is larger in diameter. I doubt that the computer will have much trouble adjusting to that.

 

[Sport (no trac)]

Jason, I see what you are saying, but if you swap the electronics, the computer will still think it is getting a reading from a 60mm sensor when the actual sensor will be 65mm (I don't know the sensor diameters, just using these as an example). This will lean out the air fuel mixture and cause its own host of problems like overheating, burning out the cats (engines run rich to cool the cats, leaning does the opposite), frying pistons, etc.

Why not just buy an aftermarket MAS? Try Pro-M, they are the best. IMHO, unless you did head or short block work, a larger MAS is a waste of money.

 

[Jason_25]

I understand but I'm hoping it will adapt to the airflow. If not, oh well. Aftermarket MAF's are not made for 95-96's.

 

[Rob Slade]

I tried to install that MAF sensor today...turns out they were identical in size. So I decided not to install it. Oh well.

 

[Jason_25]

Oh well......unless you have a blower I don't think the engine is gonna suck up alot more than that size anyway.

Thanks for trying though.