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Fuel Injection for an Older Land Cruiser

Passenger Front Side View
Jim Godwin | Writer
Posted August 12, 2004

Tractor power meets electronic fuel managment

Land Cruisers have been prowling the earth for more than 40 years, with power provided by carbureted gasoline engines, or, outside the U.S., diesel engines. Until 1993 the F series engines were used in 'Cruisers. These are inline-six engines with a displacement around four liters. The earliest engines were the Fs. The 2F, with an improved oiling system and other upgrades, replaced the F in 1975. Both the F and 2Fs were carbureted. In the late '80s Toyota made a few more changes to the 2F, the most noticeable being a new intake and exhaust manifold and the incorporation of electronic fuel injection. This version was dubbed the 3FE. FJ40s and FJ55s received an F or 2F engine, depending on the model year. FJ60s were only available with the 2F. The 3FE powered the FJ62 and the FJ80 through 1992.

WHY FUEL INJECTION?
The merits of fuel injection, long touted on the pages of this magazine, include constant fuel delivery no matter the angle of the vehicle, easy starting, smooth running even when the engine is cold, no vapor lock, improved gas mileage, and reliability. For the drivers of FJ60 Land Cruisers wanting the benefits of fuel injection and wanting to keep their venerable wagons, swapping in a 3FE from an FJ62 is a viable option. This engine swap was performed on an '85 FJ60, and the donor vehicle was an '88 FJ62. A carbureted 2F was pulled from the 60 and replaced with a 3FE from the 62.

HOW TO DO THE SWAP
Apart from the engine, two of the most critical components of the EFI system are the wiring harness and computer. The wiring system can be most intimidating, but fortunately Toyota logically arranged the wiring harness with plugs that usually will only work in one location. To most effectively do the swap the entire wiring harness from the FJ60 needs to be removed and replaced with one from an FJ62. Extrication of the 60's wiring harness requires the removal of the dash, instrument cluster, and heating and A/C ducts. From this point it's a simple matter of disconnecting the wiring in the engine bay and feeding it into the cab, unplugging the taillight and rear wiper harness, unbolting the fuse block, relay, and control boxes, and unhooking dashboard switches.

FE after it has been installed in the engine bay of an FJ60. The headlight-washer reservoir was lost to accommodate the silencer, near the coolant overflow bottle. Mounting points were present for the large canister-style air cleaner (passenger-side inner fender) and emissions controls (driver-side inner fender).

Installation of the 62's harness is the reverse of pulling the 60's harness. One difference between the harnesses is that an additional 231/48-inch, or 55mm, hole must be drilled in the firewall on the passenger side. This is to route the EFI subharness into the engine bay. FJ62s have a four-headlight system while 60s have a two-headlight system. If you retain the 60's headlights after swapping in the FJ62 harness, one set of headlight plugs, the set with only two slots, will be unused. The three-slot plugs are used with the high/low beams, but to use these plugs, two of the wires must be swapped. Toyota uses a switchable ground on the headlights. One wire carries the current, while the other two switch between the high and low functions. Simply plugging up the headlights will give a reversed high/low switching. The grounds must be identified and swapped to restore proper headlight operation.

With the installation of the 62's wiring, the choice can be made to install power windows and mirrors. If these features are not to be used, the wiring subharness is easily unplugged from the main harness. After installing the harness the 'Cruiser will have an intermittent function added to the rear wiper. To restore proper A/C operation after the swap, the FJ60's A/C amplifier must be replaced with one for an FJ62, even though the A/C plugs are identical.

Dashboard switches need to be swapped with those from the 62. The instrument clusters will hook up without a problem. FJ60s have a yellow choke light on the dash; FJ62s have a yellow check engine light. The bulb for the check engine light fits nicely in the choke light location, providing a warning light in the event there is a problem with the EFI system. Taillights, horns, and turn signals plug up nicely, as no changes were made between the models.

Engine Bolt-on Location Comparison
2F Engines 3F Engines
Driver-side Upper: Power Steering Pump Air Pump
Driver-side Lower: Air Pump* Alternator
Passenger-side Upper: Alternator Power Steering Pump
Passenger-side Lower A/C Compressor A/C Compressor

FJ60 and FJ62 fuel tanks appear to be identical in outer dimensions, and both are supported by a pair of metal straps, but the tanks differ. Fuel sending units are identical, so a unit from either vehicle will work. Swapping in the 62's tank is the easiest way to obtain a high-pressure fuel feed, since the electric fuel pump is in the tank. Along with the tank, the 62's straps must be used, but be aware that they come in a left and right configuration. Once the tank is in, the two fuel lines-one a high-pressure delivery line and the other a return line-can be routed up to the engine bay.

One other small bit of fabrication to the firewall is needed. The connection between the throttle pedal and carburetor of the 2Fs is by a rod system. Throttle control on the 3FE is cable-actuated, and the cable housing routes through, and bolts to, the firewall near the throttle pedal. To restore a stock-type throttle-cable setup, the appropriate section of firewall was cut from the 62 and patched into the 60's firewall.

In the U.S. all 3FE 'Cruisers are equipped with an automatic transmission, but in other countries the 3F was offered with a manual transmission. Although the crankshafts differ between the 2F and the 3FE, the clutch and bellhousing from the 2F will bolt to the 3FE. The '85 and later FJ60s have a bellhousing cast with a 3F on it, which may indicate that Toyota was making a transition from the 2Fs to the 3Fs. No important communications pass between the auto trans and the fuel-injected engine, so no engine functions are affected by using the manual trans. Once the clutch and bellhousing are attached, the engine can be set in the bay. The 3FE fits in exactly as the 2F did, thus no changes to the motor mounts or drivelines are needed.

One function is lost by using the manual transmission instead of the auto tranny: the neutral safety switch. One plug on the 62 that connects to the transmission has a black/red wire, black/white wire, and red/blue wire. The black/red and black/white wires are for the neutral safety switch. With these wires connected, normal starting functions are reestablished; otherwise no current is carried to the starter when the ignition is turned to the start position. The red/blue wire routes to the backup lights. Wiring from the backup switch on the manual trans must be patched to this wire.

3FE into an FJ40: Will it work?
Since the FJ40s were set up for an F or 2F engine, and a 2F can easily be swapped for an F, the reasonable assumption is that a 3F will also fit. A 3FE in an FJ40 would be an excellent setup, but it would not be as easy as dropping the engine into an FJ60. More fabrication and custom work would be needed. The placement of the air cleaner might be a problem. A new exhaust from the manifold would need to be built. Routing the wiring harness and mating it to the older switches of the 40 would be challenging. New fuel lines and a high-pressure fuel pump would be needed. Placement of the computer would need to be well thought-out to prevent contamination. Once these hurdles were overcome, however, the 'Cruiser would have an engine to take on the most challenging trails.

Sources

Toyota Land Cruiser Association
www.rubithon.com
Land Cruiser FAQ
www.off-road.com/tlc/faq
TLC Performance
Lancaster, OH 43130-7982
TPI
Gallatin, TN 37066
Specter Off-Road, Inc.
Chatsworth, CA 91311
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