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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 02-17-2014, 10:59 PM   #1
andersed
 
Join Date: Feb 2014
Vehicle: 1990 Ford Mustan GT
Location: Florida
Posts: 3
Default stock tune to modified ecu

I'm new to all this fuel injection stuff. I just bought a 1990 GT with a 1999 Explorer 5.0 that has not been final assembled. The previous motor that ran in the car was a highly modified TFS top end with a big MAS air meter (not sure how big, but much larger than stock and full length headers. I intend to leave the Explorer motor stock with a Mustang upper and lower intake with a cold air intake and shorty BBK headers. I do not have access to the owner that modified the car. Can I use the computer in the car or do I need to replace it? If I replace it does anyone have any advice as to which would be best? I intend to use this car to commute 75 miles a day to and from work, so I would like to keep reasonable mileage and the most dependability I can get.
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Old 02-18-2014, 02:16 AM   #2
dawson1112
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Join Date: Jul 2012
Vehicle: 1990 lx hatch 5.0
Location: ohio
Posts: 2,609
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Pull the computer and look to see if there is a chip in it.
If there is just pull it and it should put the computer back to stock.
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Old 02-18-2014, 09:46 AM   #3
mongolchuck
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Join Date: Feb 2007
Vehicle: 1991 LX Convertible
Location: IA
Posts: 147
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Putting the mustang upper and lower will choke that motor which isn't as good in upper rpm to begin with.
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Old 02-18-2014, 10:50 PM   #4
andersed
 
Join Date: Feb 2014
Vehicle: 1990 Ford Mustan GT
Location: Florida
Posts: 3
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Thanks so much for the info, I just pulled the chip. Does anything go back where it came from? Is that chip sellable?

I have the Explorer intake, should I try to make that work instead? Can I use stock Mustang air meter and parts to straighten out that 90 degree elbow? I apologize for my ignorance of the parts, I'm an OLD carb guy, this is my first fuelie motor.

Thanks for all your help!
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Old 02-19-2014, 07:38 AM   #5
mongolchuck
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Vehicle: 1991 LX Convertible
Location: IA
Posts: 147
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The explorer intake can be adapted pretty easily, its a very common mod. The biggest thing with the explorer engines is they are truck engines; built for low end torque more than anything else. The cams are not the same as a mustang ho motor. There are tons of write ups on this an other forums about explorer parts and engines. Search gt40 intakes to start.
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Old 02-19-2014, 07:55 PM   #6
andersed
 
Join Date: Feb 2014
Vehicle: 1990 Ford Mustan GT
Location: Florida
Posts: 3
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Thank you very much for your assistance, I believe I have a plan. I'm using the Explorer intake with a Mustang EGR, MAF, TB, and cold air. I like low end torque so I'll stay with the Explorer cam for now. I may be back with more questions after I light it off and it runs goofy!!
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Old 02-19-2014, 07:55 PM
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