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.

carb vs efi

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Old 12-23-2010, 09:44 AM
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superstang92
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Default carb vs efi

i just got my first mustang witch is a 85 mustang lx, it orginally had a v6 which i believe was efi. since then the v6 was pulled and the orginal owner put a v8 dont know it it was efi or not, now it has no motor or tranny, i want to put a carburated v8 in it. how would i know if this car still has the computer and if it does how can i change it from efi to carb,
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Old 12-23-2010, 10:03 AM
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enix187
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the nice thing about carbed motors is they're plug and play most of the time, let someone like resto get in here to help you.
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Old 12-23-2010, 10:13 AM
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superstang92
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so is there like just one wiring harness for carb and efi engines or can i just get one that is design for carb engines
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Old 12-23-2010, 03:34 PM
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dreamer1uk
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Doing a search will answer just about all your questions

To figure out if you have EFI engine harness or not, you simply need to see if there is connectors for the EGR, ECT, TPS and so forth. Very basic. You can also see if the stock ECU is still in the vehicle.

Even if you have EFI, you can still remove the engine bay harness and the computer and just do some wiring for the ignition system using the stock part of the EFI ignition harness.

Theres lots of options out there for your igntion system from using the older Ford Duraspark, using an MSD application, an old vacuum advance distributer or even some people use Chevy's HEI.

Some people also use there stock EFI pump and fuel lines by using a good quality adjustable FPR.

You will have to see if anyone who has done the swap here (many have ) and see what methods they used for the swap.

Research, research, research
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Old 12-23-2010, 04:01 PM
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tohoopty
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i run a hei distributor and it only needs one wire to run the car.then i got 2 sending unit wires and a tach wire coming off the motor other than the starter wire and the alt harness

Last edited by tohoopty; 12-23-2010 at 04:07 PM.
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Old 12-24-2010, 12:22 AM
  #6  
mjr46
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you need no harness for carb!! 12v is all that you'll need, you can hard wire ignition and alt in = easy
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Old 12-24-2010, 10:32 AM
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superstang92
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all i want is to run my car with a carb engine,i hace no knowledge of wirin a car and puttin a engine inand wiring it
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Old 12-24-2010, 10:53 AM
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dreamer1uk
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Originally Posted by superstang92
all i want is to run my car with a carb engine,i hace no knowledge of wirin a car and puttin a engine inand wiring it
Then how do you expect to do the swap? If you looking to do this own your own the first time, more power to you. But i would highly recomend doing a search and gathering as much info as you can
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Old 12-24-2010, 11:31 AM
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superstang92
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i have been doin research and goin to school to be an tech but never got a project on my own and i just started school and yes i am ready do this swap and that why im ask yall for info and plus my searchin will give me the most info so i can put a carb in now my empty engine bay
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