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Does anyone need a Painless EFI harness? (not a F/S thread)

There are a couple members here who mentioned plans of switching/going with EFI. The linked harness is a steal at that price and if were involved in an EFI swap would snatch it up in a heartbeat. I used the FordInjection harness, which in my opinion is nicer, but mostly just due to the fact that it comes pre-wrapped. With a $400+ savings, you could wrap the Painless harness yourself and save a considerable amount of $$$.
 
I may have to contact them. I was planning on using the original 5.0 harness, but it may be worth it to not have to mess with it.
I noticed it said mass airflow. will it only work with mass air?

Of course his name is Nick, sooo............. :lol
 
"RapidRabbit" said:
I may have to contact them. I was planning on using the original 5.0 harness, but it may be worth it to not have to mess with it.
I noticed it said mass airflow. will it only work with mass air?

Of course his name is Nick, sooo............. :lol
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Ford had two types of monitored induction with their '86 to 95 Fox cars.... Speed density in '86-87 and then Mass Air Flow in '88-95.

By design, Speed Density did not mesh well with engine modifications, thus most '86-87 owners who made engine modifications also made the switch to Mass Air.

What other choices did you have in mind?

You wouldn't want it to work with anything besides Mass Air.

I also noticed the sellers name and immediately made the same connection.
 
the engine I bought is speed density and I am not sure if I am going to switch to mass air.
What is needed to switch to mass air? just the sensor or does the ecm need to be replaced too.
 
What is needed to switch to mass air?
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Are you 100% sure your EFI system is Speed Density? I can't imagine anyone bolting a TrickFlow intake on with a Speed Density system.

The major differences.... to the best of my abilities... are the addition of the Mass Air Meter and the absence of a firewall mounted sensor.... I'm trying to remember the name of it.... barometric type sensor of some sort.... darn it, can't remember exactly.

Your engine may be an '86-87, but switching it to Mass Air is easy and the sensible thing to do. Speed Density did not perform well with engine changes such as cam swaps or intake/head upgrades.
 
"daveSanborn" said:
Are you 100% sure your EFI system is Speed Density? I can't imagine anyone bolting a TrickFlow intake on with a Speed Density system.

The major differences.... to the best of my abilities... are the addition of the Mass Air Meter and the absence of a firewall mounted sensor.... I'm trying to remember the name of it.... barometric type sensor of some sort.... darn it, can't remember exactly.

Your engine may be an '86-87, but switching it to Mass Air is easy and the sensible thing to do. Speed Density did not perform well with engine changes such as cam swaps or intake/head upgrades.
Click to expand...

the engine is an 88 and I was told it was speed density. 89 was the first year for mass air.
Some California models got the mass air in 88.
i don't plan on swapping out the cam or anything now. Just trying to do a basic swap for now.
 
Speed density systems rely on the Manifold Absolute Pressure (MAP) sensor, firewall mounted barometric pressure sensor, and the Throttle Position Sensor (TPS) to calculate the volume of air entering the engine. The computer then uses that calculation and compares it to a fuel chart to decide how much fuel to dump into the engine. While speed-density have a range of self-adjustability, they're really only designed to operate within a set of parameters. This is why most aftermarket EFI systems require a preflash from the factory with your engine specs, and a reflash if you change anything major down the road.

Mass-air systems use a Mass-Air Flow (MAF) sensor to measure (rather than calculate) the mass of air entering the engine, which the computer then uses to calculate how much fuel is needed. Mass-air systems are much more forgiving and self-adjusting. As long as you have a fuel system up to the task, the computer will automatically adjust the amount of fuel needed, regardless of major engine mods, like heads and camshafts.
 
"Starfury" said:
Speed density systems rely on the Manifold Absolute Pressure (MAP) sensor, firewall mounted barometric pressure sensor, and the Throttle Position Sensor (TPS) to calculate the volume of air entering the engine. The computer then uses that calculation and compares it to a fuel chart to decide how much fuel to dump into the engine. While speed-density have a range of self-adjustability, they're really only designed to operate within a set of parameters. This is why most aftermarket EFI systems require a preflash from the factory with your engine specs, and a reflash if you change anything major down the road.

Mass-air systems use a Mass-Air Flow (MAF) sensor to measure (rather than calculate) the mass of air entering the engine, which the computer then uses to calculate how much fuel is needed. Mass-air systems are much more forgiving and self-adjusting. As long as you have a fuel system up to the task, the computer will automatically adjust the amount of fuel needed, regardless of major engine mods, like heads and camshafts.
Click to expand...

Yeah.... that's what I was fumbling around trying to say. Thanks!
 
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