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1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose. 2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury. 3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks. Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for poor engine performance and repair as necessary. 4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reservoir, refer to Vacuum Reservoir REMOVAL /INSTALLATION . Disconnect vacuum line at reservoir and connect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If vacuum is being lost, replace reservoir. 5. Verify operation of one-way check valve and check it for leaks. a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine vacuum source. Disconnect vacuum hoses (lines) at each end of valve. b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not bleed off. If vacuum is being lost, replace one-way check valve. c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has ruptured. Replace valve.

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1992 ENGINE PERFORMANCE Chrysler Motors/Mitsubishi Vacuum Diagrams Chrysler Motors; Colt, Colt 200, Colt Vista, Ram-50, Stealth, Summit, Summit Wagon Mitsubishi; Diamante, Eclipse, Expo/Expo LRV, Galant, Mirage, Montero, Pickup, Precis, 3000GT INTRODUCTION This article contains underhood views or schematics of vacuum hose routing. Use these vacuum diagrams during the visual inspection in F – BASIC TESTING article in the ENGINE PERFORMANCE Section. This will assist in identifying improperly routed vacuum hoses, which cause driveability and/or computer-indicated malfunctions. VACUUM DIAGRAMS COLT, COLT 200, MIRAGE & SUMMIT Fig. 1: Vacuum Diagram (Colt, Colt 200, Mirage 1.5L & Summit Calif.)

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NOTE: 1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Install a fuel pressure gauge between fuel pressure regulator and fuel distributor pipe. See Fig. 1 . Bleed air from fuel line going to pressure gauge. 2. Unplug fuel pressure regulator Vacuum Switching Valve (VSV) connector on right side fender skirt. This is a 4-wire connector with Black and Blue wires in harness. PCM controls VSV to cut vacuum to fuel pressure regulator during hot engine starts. 3. Start engine and measure fuel pressure at idle. Disconnect fuel pressure regulator vacuum hose. Note fuel pressure at idle with vacuum hose disconnected (no vacuum). Fuel pressure should be 42 psi (3.0 kg/cm2 ). See FUEL PUMP PERFORMANCE . 4. If fuel pump pressure is low, check for fuel leaks, restrictions in intake side of fuel pump, leaking injectors, faulty pressure regulator or faulty fuel pump. If fuel pressure is high, check for restrictions in return line to tank or faulty pressure regulator. If pressure does not change when pressure regulator is disconnected, replace pressure regulator. 5. Reconnect pressure regulator vacuum hose and check fuel pressure (with vacuum). Fuel pressure should be 35 psi (2.4 kg/cm2 ). Apply battery voltage to VSV connector Blue wire terminal, and ground Black wire terminal (with vacuum). See Fig. 2 . Fuel pressure gauge should read about 42 psi (3.0 kg/cm2 ). If fuel pressure is not within specification, check for defective VSV. 6. Disconnect and plug vacuum hose from fuel pressure regulator. Stop engine and ensure fuel pressure remains greater than 35 psi (2.4 kg/cm2 ) for 4 minutes after engine stops. 7. If pressure drops, check for leaking injectors, faulty pressure regulator or bad check valve in fuel pump. If engine does not start, by-pass fuel pump relay to check for fuel pressure. Remove fuel pump relay from underhood fuse/relay box. Connect a fused jumper wire between terminals No. 1 and 3 of fuel pump relay connector in fuse block. See Fig. 3 and Fig. 4 . 8. If fuel pump does not operate, check for battery voltage to terminal No. 3. If battery voltage is present, check for open in fuel pump circuit. If fuel pump operates with jumper wire installed, check fuel pump relay and relay energizing circuit. Repair as necessary. Begin basic fuel system diagnosis with testing fuel pressure.

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QUICK-CONNECT FITTINGS Different types of quick-connect fittings are used to attach the various fuel system components, lines and tubes. These are: a single-button type, a two-button type, a pinch type, a single-tab type, a two-tab type or a plastic retainer ring type. Some are equipped with safety latch clips. Some may require the use of a special tool for disconnection and removal. DISCONNECTING WARNING: The fuel system is under a constant pressure (even with engine off). Before servicing any fuel system hose, fitting or line, fuel system pressure must be released. See: Fuel Pressure CAUTION: CAUTION: Release\Service and Repair Before separating a quick-connect fitting, pay attention to what type of fitting is being used by referring to Quick- Connect Fitting Removal. This will prevent unnecessary fitting or fitting latch breakage. The interior components (O-rings, clips) of quick-connect fittings are not serviced separately, but new plastic spacers and latches are available for some types. If service parts are not available, do not attempt to repair the damaged fitting or fuel line (tube). If repair is necessary, replace the complete fuel line (tube) assembly. 1. Perform fuel pressure release procedure. See: Fuel Pressure Release\Service and Repair 2. Disconnect negative battery cable from battery. 3. Clean fitting of any foreign material before disassembly. 4. Single-Button Type Fitting: This type of fitting is equipped with a single push-button (2) located on the quick-connect fitting. 5. The push-button is attached to two internal latches (1). To disconnect, press on push-button with your thumb and unlatch fitting from fuel line. Special tools are not required for disconnection. DO NOT ATTEMPT TO PRY OR PULL UP ON PUSH-BUTTON. LATCHES WILL BE BROKEN.

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1. Remove the hood. 2. On A/C equipped vehicles, recover the air conditioning system; refer to Section 412-00 . 3. Drain the cooling system; refer to Section 303-03 . 4. Relieve the fuel pressure; refer to Section 310-00 . 5. Disconnect the battery ground cable. 6. Remove the upper front air deflector (19E525). 1. Remove the ten screws. 2. Remove the upper front air deflector. 7. Remove the engine air cleaner outlet tube; refer to Section 303-12 . 8. Remove the radiator, fan blade assembly, and fan shroud; refer to Section 303-03 . 9. Remove the accelerator control splash shield. 1. Remove the two bolts. 2. Remove the accelerator control splash shield. 10. Disconnect the (A) accelerator cable end and, if equipped, the (B) speed control actuator cable end. 11. Remove the (A) accelerator cable to bracket bolt and, if equipped, the (B) speed control actuator cable to bracket bolt and position the (C) accelerator cable and, if equipped, the (D) speed control actuator cable aside. 12. Disconnect the vapor management valve (VMV) hose. 13. Disconnect the manifold vacuum connection. 14. Disconnect the (A) intake manifold runner control (IMRC) vacuum connectors, the (B) fuel pressure regulator vacuum connector, the (C) IMRC solenoid vacuum connector, the (D) engine vacuum regulator (EVR) vacuum connector, and the (E) vacuum reservoir connector. 15. Disconnect the exhaust gas recirculation (EGR) valve vacuum connector. 16. Position the power steering reservoir aside. 1. Remove the three bolts. 2. Position the power steering reservoir aside. 17. On A/C equipped vehicles, position the A/C lines aside. 1. Remove the A/C compressor manifold bolt. 2. Disconnect and position the A/C lines aside.