Mass Air Meter Problem! Got Scammed!!!!
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Mass Air Meter Problem! Got Scammed!!!!
hello, Ive got the ford racing mass air conversion on my 87 f150 with a mild built 5.0/aod. the maf conv. kit came with the stock 58mm (mustang type) maf.
well after i did the mild build last year, i went on ebay and bought a 70mm Maf for 19lb injectors........never could get it to run right with the 70mm. it would just backfire if i got on the gas.....and when i was able to try and drive it, it was gutless.
well i just now looked up the part number for the 70mm and it says that ive got a maf for a 95 3.8 thunderbird! i guess i got scammed! no wonder it wouldnt work.
my question is, cant i just swap out the electrical part on the two meters? if the 70mm will accept the 58mm connector, i should have better flow because of the big difference in the physical inside diameter of the two... thanks
well after i did the mild build last year, i went on ebay and bought a 70mm Maf for 19lb injectors........never could get it to run right with the 70mm. it would just backfire if i got on the gas.....and when i was able to try and drive it, it was gutless.
well i just now looked up the part number for the 70mm and it says that ive got a maf for a 95 3.8 thunderbird! i guess i got scammed! no wonder it wouldnt work.
my question is, cant i just swap out the electrical part on the two meters? if the 70mm will accept the 58mm connector, i should have better flow because of the big difference in the physical inside diameter of the two... thanks
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Joined: Dec 2007
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From: Noblesville,IN
If you're asking if you can swap a MAF sensor from one size inlet to another, the answer is most likely yes, but...
If it will physically interchange that's part of it but your ECM may need to be modified by a tuner to make the vehicle run properly. This may have been the problem with the T-Bird 70MM MAF. The sensor reads a certain range of airflow and if you up the airflow the computer may cause your check engine light to come on because the engine will run lean. A good tuner should be able to fix you up but you might have to trailer the vehicle to their shop or put the new parts on there. Lean conditions can eat pistons.
If it will physically interchange that's part of it but your ECM may need to be modified by a tuner to make the vehicle run properly. This may have been the problem with the T-Bird 70MM MAF. The sensor reads a certain range of airflow and if you up the airflow the computer may cause your check engine light to come on because the engine will run lean. A good tuner should be able to fix you up but you might have to trailer the vehicle to their shop or put the new parts on there. Lean conditions can eat pistons.
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i just found a couple sites that state the 95 t-bird 3.8 has 15lb injectors. im wondering if that was my problem, the 70mm was calibrated for 15lbers.
im gunna try swapping the electronics from my 58mm to the bigger 70mm housing and see if my computer adapts to the increase in air being sucked in.
if not ill swap back. ill be sure to post my results
thanks for the help guys!
im gunna try swapping the electronics from my 58mm to the bigger 70mm housing and see if my computer adapts to the increase in air being sucked in.
if not ill swap back. ill be sure to post my results
thanks for the help guys!
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nevermind! still wont run right. i dont understand, i put a mild cam, gt 40 heads, edelbrock efi intakes, and the computer loves it. but i try to put a bigger maf on it and it will have none of it!
i thought these maf computers were supposed to compensate for changes in flow???
i thought these maf computers were supposed to compensate for changes in flow???
Lead Driver
Joined: Nov 2002
Posts: 9,556
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From: Concord, NC
They do compensate for the most part, but it depends on the correct voltage signal getting to the computer. An incorrect MAF voltage vs. mass flow curve will cause problems. Switching the electronics won't work either because the sampling tube is critical for correct measurement and a change in the overall size will change the sensed mass flow as well.
4wd Low
Joined: Feb 2009
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From: St Louis
I would think that you are loosing velocity with the larger MAF, therefore that little heating element is telling the ecm that there isn`t much airflow so the injectors aren`t squirting but the o2 sensors are telling the ecm a different story they are telling it that it`s too lean and begging for more gas.
You definitely need to get a tuner or just sell it and buy a chevy. Ha ha ha
You definitely need to get a tuner or just sell it and buy a chevy. Ha ha ha
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well look who finally joined fte! ha ha about time!
thanks for all the responses....one more question....actually two more
1. should i scrap the 70mm since it is probably calibrated for 15lb injectors, or when i get it dynotuned can Mike@5startuning recalibrate that meter to what i need?
2. im kinda ignorant about sampling tubes, but ive noticed that the c&l meters have removable flow-through tubes. my 70mm has a plate on the back of the sampling tube blocking it from being flow-through.....but it has 2 torqx bolts and the plate can be removed.....just curious if anyone knows why ford blocks the back off?
thanks
thanks for all the responses....one more question....actually two more
1. should i scrap the 70mm since it is probably calibrated for 15lb injectors, or when i get it dynotuned can Mike@5startuning recalibrate that meter to what i need?
2. im kinda ignorant about sampling tubes, but ive noticed that the c&l meters have removable flow-through tubes. my 70mm has a plate on the back of the sampling tube blocking it from being flow-through.....but it has 2 torqx bolts and the plate can be removed.....just curious if anyone knows why ford blocks the back off?
thanks
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
The block off plate may be a way that Ford used to calibrate the sensors. The calibrating for injector sizes is really just a way to trick the computer. For example, the GT mustang used 19 lb injectors, while the cobra used 24 lb injectors, but both used the same mass airflow meter. The larger injector size was accounted for in the computer. The computer uses the mass flow rate as a basis for engine fuel requirements and spark advance in some configurations, so changing the calibration of the mass flow meter to make up for larger injectors is just a cover up that will cause more problems that it is likely to solve. What really needs to be done here is to source the correct mass flow meter, or one with the correct voltage curve if you want one bigger than the one that came with the kit, or have the computer transfer function tuned to match the V6 thunderbird air meter, provided it has the flow capacity needed for your truck engine.
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cool thanks! so i need to get, correct maf meter, underdrive pulleys, 1.7 rollers, a good tune/chip, and then i can move on to less important things like my wasted ball joints and rear brakes....lol