1988 JEEP CHEROKEE jump start terminals

SPARK PLUGS
SPARK PLUG TYPE TABLE








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Application Champion No.
All Models ....................................... RFN14LY









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SPARK PLUG SPECIFICATIONS TABLE








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Gap: In. (mm) Torque: Ft. Lbs. (N.m)
0.035 (0.89) ................................ 7-15 (10-20)









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FUEL PUMP
4.0L
1) Remove the cap from the pressure test port located in the
fuel rail. See Fig. 1. Connect Fuel Pressure Gauge (J-34730-1) to the
pressure fitting.
2) Start vehicle. Pressure should be approximately 31 psi (2.\
1 kg/cm
) with the vacuum hose connected to the pressure regulator and
39 psi (2.6 kg/cm) with the vacuum hose removed from the pressure
regulator. See FUEL PUMP SPECIFICATIONS TABLE .
3) Check the fuel pump flow rate. A good fuel pump will
deliver at least one liter of fuel per minute with the fuel return
line pinched off. If the fuel pump does not pump adequately, inspect
the fuel system for a plugged fuel filter or filter sock.
4) Fuel pump flow rate can be checked by connecting one end
of an old A/C gauge hose to the fuel test port on the fuel rail and
inserting the other end of the hose into a container of at least one
liter or more capacity.
5) Run the fuel pump by installing a jumper wire into
diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the
fuel return line or most of the fuel will be returned to the fuel
tank.
Fig. 1: Fuel System Pressure Test Components
Courtesy of American Motors/Jeep Corp.
4.2L
Perform fuel pump test with air cleaner removed and fuel