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Old 10-18-2011, 22:08   #1 (permalink)
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TBI or MPFI?

Well I"m new to the car game, and I just happened to have an old 1985 Crown Vic sitting in the back. Since we (my family) have been crunched for transport, we decided to fix it up as a daily driver. I have a friend who says he has the parts to convert the '85 302 from TBI to MPFI. My question for you is: Is it worth the time, and possible money to convert fuel systems? I don't know all the specs for the original engine, so any info would be helpful.
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Old 10-19-2011, 21:55   #2 (permalink)
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Re: TBI or MPFI?

The two big questions are:

-Does it run OK on the present TBI setup?

-How much would he charge you to make the swap and what kind of a guarantee would he give you that it would work OK?
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Old 10-20-2011, 01:00   #3 (permalink)
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Re: TBI or MPFI?

it can be done... better more reliable way for engine too... would need lower intake, upper intake, engine wiring and brain, plus fuel injectors and rail and stuff... figure that the car is already CFI as Ford calls it and has a couple injectors... you would be upgrading to SEFI with 8 injectors instead ... it has been done and i know of some who have done this
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Old 10-20-2011, 09:41   #4 (permalink)
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Re: TBI or MPFI?

Hello:
Some sequential fuel injected engines had different firing orders. This swap might require a cam change.
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Old 10-22-2011, 01:39   #5 (permalink)
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Re: TBI or MPFI?

5.0L H.O. engines had same order as 351w... standard issued 5.0L firing order in Crown Vic is same as the CFI to SEFI and no changes as far as i know of
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Old 10-22-2011, 18:45   #6 (permalink)
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Re: TBI or MPFI?

I am going from memory, and I have built too many small blocks to remember them all, but it was an '80's carburated engine short block, that we built and installed into a later model Mustang. We used a multiport sequential port intake system and the firing order of the old model, but new engine, was different from the 302HO and 351 engines, and I did have to change the cam.

You are correct that the CFI engines have the same firing order, they are "newer", and I doubt if it will be a problem for the web member who requested the info, but it is something he should be aware of. The old firing orders started with 1-5-4 (same as all old small block 221, 260, 289, 302, + the 460's and the FE Fords, I still have a '66 427), all newer engine firing orders start with 1-3-7----- (I don't recall the entire order, but check your manuals to be sure).

Sequential injection will not produce more horsepower, but it (usually) will provide a cleaner and smoother running engine. In my opinion, however, it is not worth the cost unless you have most of the parts from a doner car or the car you are modding is a real "keeper".
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