Swap 1999 Flex Fuel Sensor with a 2000 FFS
#1
Swap 1999 Flex Fuel Sensor with a 2000 FFS
Hey, so I just bought my 1999 XLT 4x4 3.0 ranger. Its my first truck and I ran into an issue with the Flex Fuel Sensor. The previous owner installed some aftermarket sensor which fixes the issue, but doesn't allow for Flex Fuel. Now, I don't want or need Flex fuel but the after market part seems to just delay the real problem until down the road. I don't want to buy a 1999 flex fuel sensor online for over $500 and I found a salvage yard that'll sell me a FFS for $150. Only problem is is that it is a 2000.. Will I be able to swap these without trouble? Thanks
#2
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Yes, it should work fine, Ford used the same sensor from 1999 to 2003
The FF replicator is what you have now, tells computer you are running gasoline
Ford dropped these on most FF vehicles in favor of better computer software and wider band O2 sensors
You have to add more ethanol fuel than gasoline to the same amount of air to get the correct air/fuel ratio, and thats what O2 sensors tell the computer, not sure why they ever even used the flex fuel sensor
I guess Cold Start could be an issue but computer already has a memory that could/does, remember last long term fuel trims for cold starts
The FF replicator is what you have now, tells computer you are running gasoline
Ford dropped these on most FF vehicles in favor of better computer software and wider band O2 sensors
You have to add more ethanol fuel than gasoline to the same amount of air to get the correct air/fuel ratio, and thats what O2 sensors tell the computer, not sure why they ever even used the flex fuel sensor
I guess Cold Start could be an issue but computer already has a memory that could/does, remember last long term fuel trims for cold starts
Last edited by RonD; 07-21-2017 at 04:21 PM.
#4
#5
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Open engine fuse box, find the Fuel Pump Relay, or Fuel Pump fuse, pull out either one.
Start engine, it will start and then die, fuel pressure is now at 0psi
There is a tool set for removing fuel lines, I like the plastic "ring" set: https://www.princessauto.com/en/deta...et/A-p2990323e
but the metal "scissor" tool will work: OEM Fuel line disconnect tool set 25043 - Read 4 Reviews on OEM #25043
Also both kinds seen here: http://www.ebay.com/bhp/fuel-line-tool
Start engine, it will start and then die, fuel pressure is now at 0psi
There is a tool set for removing fuel lines, I like the plastic "ring" set: https://www.princessauto.com/en/deta...et/A-p2990323e
but the metal "scissor" tool will work: OEM Fuel line disconnect tool set 25043 - Read 4 Reviews on OEM #25043
Also both kinds seen here: http://www.ebay.com/bhp/fuel-line-tool
#8
RF Veteran
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