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post #1 of 11 Old 02-18-2014, 08:29 AM Thread Starter
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Exclamation mass air sensor/maf question

just bought a 95 gt 5 spdwith some goodies..one issue that was brought to my attention was that the car has 24lb injectors being used with stock air sensor..He told me i would get periodic SEL's and the idle would boog if allowed to idle on its own for more than a minute without revving the engine because too much fuel being fed. He said to get a matching sensor for 24lb injectors or a stock mustang cobra air sensor...Is he correct?. If not what is the proper sensor for those injectors and how much would it cost...

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post #2 of 11 Old 02-18-2014, 11:00 AM
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Originally Posted by inimeg6482 View Post
just bought a 95 gt 5 spdwith some goodies..one issue that was brought to my attention was that the car has 24lb injectors being used with stock air sensor..He told me i would get periodic SEL's and the idle would boog if allowed to idle on its own for more than a minute without revving the engine because too much fuel being fed. He said to get a matching sensor for 24lb injectors or a stock mustang cobra air sensor...Is he correct?. If not what is the proper sensor for those injectors and how much would it cost...

You can't just use a 93 Cobra maf, It would need to be used with a 93 Cobra computer as well. A 94-95 Cobra maf is the same as a 94-95 GT maf.

You could buy a 94-95 cobra ECU to make it work or..

You would need a maf calibrated for an 88-95 GT for 24lb injectors.

We sell this one for 199.00 including the plug-N-play harness.

PMAS




Last edited by PMAS; 02-18-2014 at 11:04 AM.
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post #3 of 11 Old 02-18-2014, 11:17 AM
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He is about half right:

You can fix this a couple different ways:

First of all, the factory Ford meters aren't "calibrated" to an injector size. (I do not like how people refer to meters as being calibrated. Calibrated meter is noting more than tweaking the flow curve voltage of the meter to have the factory computer handle it. )

The factory Ford meters aren't "calibrated" to an injector size. The ECU is programmed for an injector size. Fox 5.0 ECUs are set up for 19LBs, the Cobras are 24. DO not get a Factory Cobra Maf and expect it to work without the matching Cobra ECU.

Here is the order IMHO on how to fix it (going from most correct to "it will prolly work"

1) if the car runs good, go get it tuned. a shop can tell the ecu it has 24lb injectors
2)get a MAF for 24lb injectors, Pro M, C&L, etc
3)purchase cobra ecu

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post #4 of 11 Old 02-18-2014, 11:36 AM
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Originally Posted by mr_minnis View Post
He is about half right:

You can fix this a couple different ways:

First of all, the factory Ford meters aren't "calibrated" to an injector size. (I do not like how people refer to meters as being calibrated. Calibrated meter is noting more than tweaking the flow curve voltage of the meter to have the factory computer handle it. )

The factory Ford meters aren't "calibrated" to an injector size. The ECU is programmed for an injector size. Fox 5.0 ECUs are set up for 19LBs, the Cobras are 24. DO not get a Factory Cobra Maf and expect it to work without the matching Cobra ECU.

Here is the order IMHO on how to fix it (going from most correct to "it will prolly work"

1) if the car runs good, go get it tuned. a shop can tell the ecu it has 24lb injectors
2)get a MAF for 24lb injectors, Pro M, C&L, etc
3)purchase cobra ecu
Correction yes you can spend the money for a tune and a flash or,

you can get a maf that is calibrated to have 1.263 times the range of the stock 19lb MAF .. 24/19=1.263, plug it in and 98% of the time it will run great.

All mass airflow sensors ARE calibrated. aftermarket and factory but you are correct, they are calibrated to a range not an injector size.

When we say a maf is "calibrated" for 38lb injectors we are simply using that as an easy to understand number for the end user. 38 just means twice the range of the stock maf that was used in an ecu that used 19lb injectors. We could call it a "2" but that would just be more confusing. If that same maf were used on a cobra "2" would mean 48lb.

And to further clarify we calibrate mass air sensors exactly the same way that the factory calibrates the sensors. Same equipment same method to tweak the voltage curve. Every factory sensor is "tweaked" at Hitachi before it ships.

One last thing I would highly advise against getting a tune to use the factory GT maf with 24lb injectors as you will run out of maf before you run out of injector. You could peg the maf and lean out the car. Ford got away with doing this as they knew EXACTLY how much power the 94-95 Cobra made.

Last edited by PMAS; 02-18-2014 at 11:40 AM.
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post #5 of 11 Old 02-18-2014, 03:24 PM
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Quote:
Originally Posted by inimeg6482 View Post
just bought a 95 gt 5 spdwith some goodies..one issue that was brought to my attention was that the car has 24lb injectors being used with stock air sensor..He told me i would get periodic SEL's and the idle would boog if allowed to idle on its own for more than a minute without revving the engine because too much fuel being fed. He said to get a matching sensor for 24lb injectors or a stock mustang cobra air sensor...Is he correct?. If not what is the proper sensor for those injectors and how much would it cost...
The real question is: Have you experienced the CEL and or idle bog?

There are cases of the EEC being able to cut enough injector pulse width to make up for the injector mismatch. It's hit or miss.

Is the car modified or mostly stock?

Easiest route, as mentioned, it to go with an aftermarket MAF for 24# injectors/A9L.

If the car is a head/cam/intake car, and running 24# injectors but a stock 5.0 MAF, it is a possibility you could peg the MAF during high load/wot runs, as mentioned above.

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post #6 of 11 Old 02-19-2014, 07:30 AM Thread Starter
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Exclamation thanks to all

Thanks for the responses. the car actually runs pretty good but if i stop at a light and let it idle on its own it will idle fine for about 30 sec to 1 minute then it slowyly starts to bog and the idle quality drops more and more. usually this is remedied by revving the engine lightly a couple times then the process starts over. So basically when i come to stoplights I rev the engine every 10-20 seconds(2-5 times)before the light turns green again...
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post #7 of 11 Old 02-19-2014, 09:48 AM
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Thanks for the responses. the car actually runs pretty good but if i stop at a light and let it idle on its own it will idle fine for about 30 sec to 1 minute then it slowyly starts to bog and the idle quality drops more and more. usually this is remedied by revving the engine lightly a couple times then the process starts over. So basically when i come to stoplights I rev the engine every 10-20 seconds(2-5 times)before the light turns green again...

Does the car have o2 sensors?
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post #8 of 11 Old 02-20-2014, 10:28 PM Thread Starter
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I just bought the car last saturday so i have not had a chance to really look at things... i think i may find a speed shop and have them look at what i have but i doo know im running very rich and was told i have a 65mm tb with 24lb injectors and stock maf
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post #9 of 11 Old 02-20-2014, 10:35 PM Thread Starter
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Quote:
Originally Posted by PMAS View Post
You can't just use a 93 Cobra maf, It would need to be used with a 93 Cobra computer as well. A 94-95 Cobra maf is the same as a 94-95 GT maf.

You could buy a 94-95 cobra ECU to make it work or..

You would need a maf calibrated for an 88-95 GT for 24lb injectors.

We sell this one for 199.00 including the plug-N-play harness.

PMAS

this will plug up and stop my idle issues correct..if so i will get the funds together to by this....i won't drive the car anymore until i atleast remedy this
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post #10 of 11 Old 02-21-2014, 07:40 AM
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this will plug up and stop my idle issues correct..if so i will get the funds together to by this....i won't drive the car anymore until i atleast remedy this
I can't promise it will fix the idle as there might be problems elsewhere. I can tell you that there is almost no way it will run correctly with 24lb injectors and a stock maf though so you defiantly are not going backwards getting the correct maf.

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post #11 of 11 Old 02-24-2014, 08:10 PM
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And to add - it needs to be mechanically sound. No vacuum leaks. No exhaust leaks. And disconnect the battery before the install.


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