running without MAF sensor
01-31-2007, 04:18 PM
#11
2nd Gear Member
Join Date: Jan 2007
Location:
Posts: 213
RE: running without MAF sensor
When the computer cant read the MAF meterit defaults to the "Load w/ Failed MAF" table. This table contains appoximate load (volumetric efficiency) values, which the computer uses depending uponengine RPM and Throttle position. Generally the calibrationsare abit on the rich side to be safe, but I doubt they would damage your engine. If that were the case I dont think Ford would have used this method. As worried as they are about durability and avoiding warranty issues I dont think they would have allowed something to be programmed into thier vehicles that would cause damage and cost them an unimaginable fortune in warranty work. After all it was designed to allow you to safely drive the vehicle at normal speeds home and to be repaired. I wouldnt recomend racing the car or hammering on it in this mode but starting it and running it should be ok. By the way 7upedition, EFI cars go into closed loop after they warm up. They warm up in open loop mode to allow the O2 senors to heat up to proper operating temp before they use them.
01-31-2007, 04:55 PM
#12
4th Gear Member
Join Date: Feb 2006
Location: Seattle, WA
Posts: 1,375
RE: running without MAF sensor
ORIGINAL: Chitown racer
When the computer cant read the MAF meterit defaults to the "Load w/ Failed MAF" table. This table contains appoximate load (volumetric efficiency) values, which the computer uses depending uponengine RPM and Throttle position. Generally the calibrationsare abit on the rich side to be safe, but I doubt they would damage your engine. If that were the case I dont think Ford would have used this method. As worried as they are about durability and avoiding warranty issues I dont think they would have allowed something to be programmed into thier vehicles that would cause damage and cost them an unimaginable fortune in warranty work. After all it was designed to allow you to safely drive the vehicle at normal speeds home and to be repaired. I wouldnt recomend racing the car or hammering on it in this mode but starting it and running it should be ok. By the way 7upedition, EFI cars go into closed loop after they warm up. They warm up in open loop mode to allow the O2 senors to heat up to proper operating temp before they use them.
When the computer cant read the MAF meterit defaults to the "Load w/ Failed MAF" table. This table contains appoximate load (volumetric efficiency) values, which the computer uses depending uponengine RPM and Throttle position. Generally the calibrationsare abit on the rich side to be safe, but I doubt they would damage your engine. If that were the case I dont think Ford would have used this method. As worried as they are about durability and avoiding warranty issues I dont think they would have allowed something to be programmed into thier vehicles that would cause damage and cost them an unimaginable fortune in warranty work. After all it was designed to allow you to safely drive the vehicle at normal speeds home and to be repaired. I wouldnt recomend racing the car or hammering on it in this mode but starting it and running it should be ok. By the way 7upedition, EFI cars go into closed loop after they warm up. They warm up in open loop mode to allow the O2 senors to heat up to proper operating temp before they use them.
You talk primarily of a stock Ford 5.0, that has been run before; in other words, the rings are seated.
This case involves a FRESH motor in which the rings have not yet seated.
Also, I believe 24lb injectors are to be utilized.
The larger injectors will dump more fuel, if not corrected for withthe properaftermarket MAF.
Excess fuel at initial startup can destroy any chance of the ringsEVER seating.
I still say leave the motor alone until the correct MAF can be istalled.
jason
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