94 computer problems

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02-16-2009, 06:29 PM

#21

Joel5.0

5th Gear Member

Join Date: Jan 2006

Location: Puerto Rico

Posts: 3,926

Quote:

Originally Posted by 94mustang94

from what i understand you can't data log a 94 computer

Wrong information...... I do it every time I have a SN95 for service, as a matter of fact, I finished work on one about 2 hours ago.... short term fuel trim values were mismatched by 23% between banks, causing a long term fuel trim value learning of +19% for bank 1 and -3% for bank 2... cause?...... exhaust leak. After adaptive learning took place, it started causing idle control problems anytime the A/C was turned on and intermittent engine stalls.

02-16-2009, 07:59 PM

#22

dudeboy

3rd Gear Member

Join Date: Nov 2007

Location: Washington, Seattle

Posts: 551

Quote:

Originally Posted by 94mustang94

i don't understand what that last reply mean

Sorry, I was in a hurry...

There are datalogging options for your ecu. I don't know if the SCT stuff does though, as I'm not familiar with it.

Anderson Ford PMS (Programmable Management System, IIRC) - This is a piggy back system, that doesn't override the factory tune. The PMS simply intercepts the signals in/out of the ecu, allowing the user to modify them. Datalogging is an option.
TwEECer RT - Can be used to make changes to the tune, similar to the SCT, but also has a datalogging option
www.tweecer.com
Moates.net gear - The soon to be released QuarterHorse will have datalogging capabilities.
www.moates.net

02-16-2009, 08:29 PM

#23

94mustang94

2nd Gear Member

Thread Starter

Join Date: Feb 2009

Location: virginia

Posts: 272

then why do so many people have such a hard time with the computers on 94 and 95 cars

02-16-2009, 09:08 PM

#24

Joel5.0

5th Gear Member

Join Date: Jan 2006

Location: Puerto Rico

Posts: 3,926

Quote:

Originally Posted by 94mustang94

then why do so many people have such a hard time with the computers on 94 and 95 cars

They don't know what they're doing, BTW.... I also forgot to mention that the '95 I worked on today, has a B-303 cam installed. Idles great, no surging or stalls now (like it was for 4 months before this service), no aftermarket tuning device or chip...... the problem was caused when the current owner replaced the clutch and didn't correct the exhaust leak he created in the passenger side header.

02-16-2009, 09:18 PM

#25

OnyxCobra

6th Gear Member

Join Date: Nov 2005

Location: Rochester, NY

Posts: 8,467

Quote:

Originally Posted by 94mustang94

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

Well if the tuner can't get it right on the street it might be time for the dyno. Dyno tuning is much more accurate and always gives better results.

02-16-2009, 09:40 PM

#26

Joel5.0

5th Gear Member

Join Date: Jan 2006

Location: Puerto Rico

Posts: 3,926

Quote:

Originally Posted by 94mustang94

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.

Have you checked the TB for binding every now and then? ...... How is the throttle cable? You may be focusing too much on the EEC side, and overlooking the simple mechanical/non EEC related possibilities that will cause that symptom. Just a thought.