Engine - Loss of Power/Surging or Stalling
Article No. 85-9-23POWER LOSS - SURGE - STALLS
- 2.3L HSC
FORD 1984 TEMPO
LINCOLN-MERCURY 1984 TOPAZ
Loss of power, surge or stalls concerns can be caused by inadequate fuel delivery due to a faulty fuel pump or worn fuel pump push rod. The fuel pump and fuel pump push rod can be checked in the following manner.
Capacity and Pressure Check
1. Remove the carburetor air cleaner.
2. Slowly (fuel line is pressurized) disconnect the fuel line at the fuel filter inlet. Use a 5/8 inch backup wrench on the hex of the filter to prevent damage. USE CARE TO PREVENT COMBUSTION OF SPILLED FUEL-BLOCK RETURN IF PRESENT.
3. Place a suitable, non-breakable container (1 pint minimum) at the end of the disconnected fuel line (a piece of hose may be needed on the fuel line end). Disconnect high tension wire from coil. Crank engine ten revolutions. The fuel pump should deliver 1/3 pint of fuel.
4. If fuel flow is to specification, perform pressure test.
5. If fuel flow is low, repeat test using a remote nonbreakable container. Remove fuel hose from fuel pump inlet supply line. Connect a length of fuel hose from the fuel supply line to the non-breakable container and repeat Step 3. If fuel flow is to specification, the problem is either a plugged intank filter or a kinked, leaking fuel hose. Service as necessary.
6. If fuel flow is still low, remove fuel pump and push rod. Measure and replace fuel pump push rod if length is less than 2.40 inches. If push rod is in specification, replace fuel pump.
Pressure Test
1. Connect a suitable pressure gauge (0-15 psi) to the fuel filter end of the fuel line (use Rotunda tester 059-0008 or equivalent). (No T is required).
2. Start the engine (it should be able to run for over 3O seconds on the fuel in the carburetor bowl) and read the pressure after 10 seconds.)
Refer to Specifications for the fuel pressure specification.
If pump pressure is too low or too high, install a new fuel pump, after the fuel pump push rod length has been verified.
3. Reconnect fuel line at filter and install air cleaner, if removed, using a 5/8 inch backup wrench on the hex nut on the fuel filter. Tighten to 20-24 Nm (15-18 ft.lb.).
Static Pressure (1) Push rod Length
5.5 - 6.5 (2) 2.40 in. (Minimum)
(1) On engine, with temperatures normalized and at curb idle speed, transmission in neutral.
(2) With fuel return line closed at fuel filter.
NOTE: volume flow rate is approximately 1 pint in 30 seconds (engine normalized).
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: Test 9350BM
TIME: 0.3 Hr.
OPERATION: Replace push rod - 9350AM
TIME: 0.4 Hr. DLR. CODING: Basic Part No. DRIVE - Code: M3