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94 computer problems

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Old 02-15-2009, 08:09 PM   #1
94mustang94
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Default 94 computer problems

I have a 94 gt with a few mods and i had a sct 4 bank chip burnt for the car and for some reason the car just decides to rev high at idle and other times it idle smooth and perfect. All the sensors were checked when the tuner burnt the chip. It just makes no sense how it runs great and everything and every now and then the car just decides to idle high. I have heard bad things about the 94-95 computers. Its like it is sensing that the car is cold so its idling high almost like a choke. all i have to do it tap the gas and the car wil idle back down perfect and run smooth. Any suggestions. Maf, tb, iac are all clean and good.
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Old 02-15-2009, 08:57 PM   #2
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I'm not very familiar with these ecu's,
but,
any codes?

How long ago was the tune done?
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Old 02-15-2009, 09:34 PM   #3
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the tunes was done today and no codes at all. I have heard it could take a few for the computer to learn everything. true?
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Old 02-15-2009, 09:42 PM   #4
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My experience... all learning is DONE within 1hr of mixed driving... even when maxing out the adaptive...

If the tune was just done today, then the tuner needs to go back over what he did.
He missed something...
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Old 02-15-2009, 09:50 PM   #5
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well i drove it home for about 30 min and then drove it around for about 10 minutes after it sat for about 2 hours. maybe that isn't enough driving?
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Old 02-15-2009, 10:13 PM   #6
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That's plenty if the tune was right!

When it took an hour for my tune to settle out, it was because the Adaptive was maxing out.
Your brand new custom tune should NOT be maxing out the Adaptive.
The tuner owes you a fix... they missed something.

Be polite and cordial when you talk to them, as pissing off the guys that can help you is seldom a good idea.

But, they missed something...
Actually, the dyno tuner shops seldom look at drivability....

good luck,
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Old 02-15-2009, 10:30 PM   #7
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what do you mean by the adaptive?...yeah i talked to him already and he is gonna tinker with it somemore...i stayed away from the dyno tune because of that reason and found this person that actually tunes by real drive time so he should be able to work most of it out...i have just heard nothing but bad things about the 94 and 95 computer because they were kind of a layover before the obd stuff in 96
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Old 02-15-2009, 10:35 PM   #8
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The Adaptive Strategy is what allows the ecu to adapt to changing conditions in the engine/sensors... by adding in a 'correction factor' to the fuel calculations.

I doubt that is your issue anyway...



It sounds like you have a good chance of getting things sorted out, especially since you have a tuner who is willing to take a second look at the car AND it isn't strictly done on the dyno....

Let us know how the retune works out,
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Old 02-15-2009, 10:41 PM   #9
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anyone one else had good/bad luck with 94 gt computers?
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Old 02-15-2009, 10:45 PM   #10
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Quote:
Originally Posted by 94mustang94 View Post
anyone one else had good/bad luck with 94 gt computers?
I know you're hoping for opinions from others...

But it isn't because of the computer...
It is a minor oversight in the tune, that's all.

Give your tuner a chance to sort it out.
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Old 02-15-2009, 10:47 PM   #11
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i understand that but i have been told by many that even with a tune that the 94/95 comps don't take well to mods and even after a tune can still have kinks here and there
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Old 02-15-2009, 10:50 PM   #12
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I have been told by many that the 94/95 comps don't take well to mods and even after a tune the car can still have kinks here and there just because of how the computers are
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Old 02-15-2009, 10:54 PM   #13
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A GOOD custom tune will resolve any of those issues... The alternative to is that you swap YOUR ecu for a Fox ecu.
Not worth the time/money...
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Old 02-16-2009, 07:38 AM   #14
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Quote:
Originally Posted by 94mustang94 View Post
I have been told by many that the 94/95 comps don't take well to mods and even after a tune the car can still have kinks here and there just because of how the computers are
A computer is a computer, it does what is programmed to do....... the SN95 is no different in that respect. Are they different than the GUFB or fox units?... yep, and the tuner needs to know those differences. The SN95 ECM also has other features (like datastream capabilities) to help in the tuning process more effectively than a fox ECM. IOW.....all those "kinks" are the tuner's responsibility to iron out..... BTSTDT. It is easy to blame parts when they are not understood.
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Old 02-16-2009, 09:56 AM   #15
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you know i heard about the horror stories as well.... but I was happily surprised when we put a 331 in my 94 and no codes at all! it adapted to all the differences beautifully! Hope it all works out!
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Old 02-16-2009, 03:59 PM   #16
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from what i understand you can't data log a 94 computer
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Old 02-16-2009, 04:06 PM   #17
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Quote:
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from what i understand you can't data log a 94 computer
pms
tweecer
moates has a product that will be released in a week or so, which should work as well
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Old 02-16-2009, 04:23 PM   #18
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i don't understand what that last reply mean
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Old 02-16-2009, 04:40 PM   #19
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man the 94/95 computers are not that big of a deal. The difference between the SN95 and fox computers is like the same thing as the sn95 vs foxbody weight differences. It's no big deal but people make it into something huge.

Just wondering, what do you mean you had "a chip burned for your car?" Was the car dyno tuned or logged while driving and adjusted, or did you tell the guy what your car had and he put it in a chip and said here you go? How much time was spent in the actual burning process?
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Old 02-16-2009, 04:43 PM   #20
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the car was logged with actually driving time and adjustments made. about 6 hours all in all was spent on the tune. no dyno tuning was done because that doesn't account for real time driving. and it was an sct 4 bank chip
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Old 02-16-2009, 04:43 PM
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