Vortech 2003-2005 Lexus 3.0L IS300 User Manual

Page 29

P/N: 4LA020-010

11JUL07 v1.1 Lexus(4LAv1.1)

8.1

FUEL MANAGEMENT UNIT (FMU) RECALIBRATION (2003 Auto)

NOTE:

This step applies to Model Year 2003 automatic vehicles only! For all

others, skip the following and proceed with Section 8.2.

Remove the six allen-head screws on top of
the fuel management unit (FMU).

Remove the diaphragm and 8:1 disk and
ring from inside of the FMU.
WARNING: Do not remove the four

screws holding the valve
body. Once taken apart,
the valve would have to
be replaced.

Install the replacement 10:1 ring (with
the notched part facing FMU body

)

around the four screws inside the FMU.
(The 10:1 components are larger in
diameter than the 8:1

Place the 10:1 disk inside the ring next to the
piston.

Install the new diaphragm and carefully line
up the holes to the body.

Place the spring retainer in the center of the
diaphragm with the spring between it and the
cover. (See Fig. 8.1-a.)

Reinstall the FMU cover with the six allen-
head screws. Do not over-tighten the screws.
The correct torque is 24 in/lb (2ft/lb).

8:1 RING SPACER

8:1 WASHER (Ø2.270")

LARGE DIAPHRAM

SPRING RETAINER

SPRING
FCU COVER

Fig. 8.1-a