diagram of vacuum lines on a 1999 GMC Jimmy
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Filed Under (Jeep) by admin on 18-11-2010
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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Filed Under (Chevrolet) by admin on 19-10-2010
1. Disconnect the brake booster vacuum check valve (1) from the brake booster. 2. If the vacuum check valve (1) needs to be separated from the vacuum hose (3), release and reposition the clamp (2) on the vacuum hose (3) and remove the check valve (1) from the hose (3). 3. If replacing the vacuum check valve (1), remove the grommet (4) from the brake booster and discard the grommet. 4. If removing the vacuum hose (2), take note of the vacuum hose routing then disconnect from the engine intake manifold connection (3) by releasing tension on the vacuum hose clamp (1) and sliding the vacuum hose (2) off the intake manifold connection (3). Installation Procedure Important: A small amount of denatured alcohol can be used as an assembly aid when installing the vacuum check valve and/or grommet. Do NOT use soap. 1. If the vacuum hose (2) was removed, install the vacuum hose into position on the vehicle as noted prior to removal, then connect the vacuum hose (2) to the engine intake manifold connection (3) and secure with the vacuum hose clamp (1). 2. If the vacuum check valve (1) is being replaced, install a NEW grommet (4) to the brake booster. 3. If the vacuum check valve (1) was separated from the vacuum hose (3), install the check valve (1) to the vacuum hose (3). Install and secure the clamp (2) into position on the hose (3). 4. Connect the brake booster vacuum check valve (1) to the brake booster.
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Filed Under (Saturn) by admin on 04-06-2010
Condition Some customers may comment on the (MIL) SERVICE ENGINE SOON telltale being illuminated. (DTC(s) P0171 – Fuel Trim System Lean Bank 1 and/or DTC P0174 – Fuel Trim System Lean Bank 2 may be set and stored in the ECM memory.) Cause This condition may be caused by insufficient torque on the intake manifold vacuum chamber bolts. Under deceleration, enough vacuum can be created inside the intake manifold to lift the vacuum chamber off it’s seal creating an intermittent vacuum leak. Correction Refer to the service procedure in this bulletin to retorque the intake manifold vacuum chamber bolts and install the vacuum chamber springs. Procedure: Notice: When servicing intake manifold, do not use power tools. Damage to threads or manifold may occur. 1. Loosen clamp at air cleaner assembly and throttle body assembly. 2. Remove attachment bolts from outlet resonator/duct assembly.
Filed Under (GM) by admin on 29-07-2010
Removal Procedure The engine oil cooler is an integral part of the radiator. The oil cooler lines are serviceable. 1. Remove the plastic cap from the connector by pulling back along the pipe. 2. Use a small pick-type tool or screwdriver in order to release 1 of the open ends of the retaining ring from the connector fitting. 3. Rotate the retaining ring out of position on the connector fitting. Remove the ring completely. 4. Discard the retaining ring clip. 5. Pull outward on the pipe in order to remove the pipe from the connector fitting. 6. Disengage the oil cooler line retaining clip at the fan shroud. 7. Remove the oil cooler line from the radiator). 8. Raise and support the vehicle. Refer to Vehicle Lifting. 9. Remove the under body protective shields. 10. Remove the oil cooler line junction block bolts. 11. Remove the oil cooler line clip bolt. 12. Remove the oil cooler lines. 13. Discard the gasket. 14. Inspect all of the fittings, the connectors and the cooler lines for damage or distortion. Installation Procedure 1. Install the oil cooler lines using a new gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the oil cooler line junction block bolts. Tighten the bolts to 9 N.m (80 lb in). 3. Install the oil cooler line clip bolt. Tighten the bolts to 50 N.m (37 lb ft).
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Filed Under (GM) by admin on 27-08-2010
On-Vehicle Service REMOVE OR DISCONNECT ^ Tools Required: – J 25034-B Pulley Remover Place a drain pan below the pump. 1. Hoses. Cap the hoses. 2. Unload the tensioner assembly. Refer to Engine. 3. Belt. 4. Pulley. – Install J 25034-B. Be sure the pilot bolt bottoms in the pump shaft by turning the nut to the top of the pilot bolt. Hold the pilot bolt. Turn the nut counterclockwise. 5. Filler neck tube. 6. Rear brace nut from engine stud. Front mounting bolts. 8. Power steering pump. INSTALL OR CONNECT Tools Required: – J 25033-B Pulley Installer 1. Power steering pump. 2. Front mounting bolts. Tighten – Bolts to 50 Nm (39 ft. lbs.). 3. Rear brace. 4. Nut and bolt. Tighten – Nut to 41 Nm (31 ft. lbs.). 5. Filler neck tube. Tighten – Filler neck tube bolt to 20 Nm (15 ft. lbs.). 6. Pulley.