88 ranger 2.9
88 ranger 2.9
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Joined: Sep 2004
Posts: 429
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The 1984 2.8 engine had a Motorcraft 2150A carburetor. The 1988 2.9 is, of course, fuel injected. The in-tank electric fuel pump has way too much line pressure than the needle and seat in the carb was ever meant to handle. The pressure must be reduced tremendously.
The engine control computer from the 2.9 shares nothing with the ignition on the 2.8 engine. Both engines used the TFI system. They will interchange, of course. But the 2.9's computer is not even necessary and won't wire up at any rate.
While the ignitions interchange, the wiring harness for the 2.9 will have about a zillion connectors no longer needed. However, the 2.9 harness does have connections for power distribution (Ford base number 14409) to the rest of the truck. The electronics involved in the change will be a confusing issue.
Fitment is, of course, no big issue. Both are the same engine families and both share common dimensions, fastener sizes, mounts, bellhousing pattern and the like. (It would be quite similar to pulling a 302 out of a 1966 Ford and putting a 289 in its place.)
The most complicated part will be ensuring that all the electrical components retained have a power source. Even the fuse boxes from 84 and 89 are totally different. Once that is sorted out correctly, the rest should be pretty easy.
The fuel delivery system will need a great deal of "tweaking" in order to get it right.
The engine control computer from the 2.9 shares nothing with the ignition on the 2.8 engine. Both engines used the TFI system. They will interchange, of course. But the 2.9's computer is not even necessary and won't wire up at any rate.
While the ignitions interchange, the wiring harness for the 2.9 will have about a zillion connectors no longer needed. However, the 2.9 harness does have connections for power distribution (Ford base number 14409) to the rest of the truck. The electronics involved in the change will be a confusing issue.
Fitment is, of course, no big issue. Both are the same engine families and both share common dimensions, fastener sizes, mounts, bellhousing pattern and the like. (It would be quite similar to pulling a 302 out of a 1966 Ford and putting a 289 in its place.)
The most complicated part will be ensuring that all the electrical components retained have a power source. Even the fuse boxes from 84 and 89 are totally different. Once that is sorted out correctly, the rest should be pretty easy.
The fuel delivery system will need a great deal of "tweaking" in order to get it right.
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lwcassady
2.6, 2.8, 2.9, 4.0 & SOHC 4.0 V6
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Mar 25, 2005 09:44 AM
