1995 gmc vandura
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Filed Under (Chevrolet) by admin on 10-06-2010
Customer Concern: The engine stumbles on acceleration and the Exhaust Gas Recirculation (EGR) valve is opening too soon. Tests/Procedures: 1. With the engine off, use a vacuum pump to pump the valve open. It should pump up and hold vacuum. 2. With the valve still pumped up, reach in and crank the engine over, the valve should slam shut and be closed before the engine starts. Potential Causes: Defective Exhaust Gas Recirculation (EGR) Valve Tech Tips: This has a negative back pressure type valve. The back pressure circuit in the valve gets plugged and causes the valve to open too soon. Diagnostic Codes: None
Filed Under (GM) by admin on 05-05-2010
DESCRIPTION & OPERATION BRAKE BOOSTER
Delco-Moraine Single Diaphragm A combined vacuum-hydraulic unit which uses a combination of intake manifold vacuum and atmospheric
pressure to provide power assist. Reserve vacuum supply and vacuum check valve allow several brake applications, with vacuum assist, after engine has stopped. Unit is composed of 2 main sections. The vacuum power cylinder and the dual master cylinder. Vacuum power
cylinder contains power piston assembly, which houses control valve, reaction mechanism, and power piston return spring. Delco-Moraine Tandem Diaphragm
Filed Under (GM) by admin on 04-06-2010
Models: 2008-2009 Chevrolet Colorado, TrailBlazer 2008-2009 GMC Canyon, Envoy 2008-2009 HUMMER H3, H3T 2008-2009 Saab 9-7X All Equipped With Engine RPOs LLR, LLV, LL8 Please Refer to GMVIS Condition Some customers may comment that the malfunction indicator lamp (MIL) is illuminated. Some customers may also comment that the engine runs rough. The technician may find DTCs P0300, P0301, P0302, P0303, P0304, P0305, or P0306 set as current or in history, depending on which engine the vehicle is equipped with. Upon further examination, the technician may observe evidence of water intrusion into the spark plug recess area. Cause This condition may be caused by an engine being exposed to a large quantity of water, which may result in some of the water seeping down past the vented threads of an ignition coil bolt, then flowing through the vent opening that is located in the bottom of the related ignition coil bolt hole, and collecting in the spark plug recess area. Correction Important: DO NOT reprogram or replace the engine control module (ECM) for this condition. If evidence of water intrusion in the spark plug recess area/s is not observed, then refer to the appropriate DTC procedures in SI.
Filed Under (GM) by admin on 12-06-2010
Test Description The numbers below refer to the step numbers on the diagnostic table. 2. Allow the engine to cool before performing this test. If the sensor is at the operating temperature, the HO2S voltage will stay high or low. If the HO2S voltage stays between 300-700 mV this indicates the HO2S heater is inoperative. 3. If more than one HO2S DTC is set, this is a good indication that the HO2S fuse is open. Test all the related circuits going to all the heated oxygen sensors for a short to ground. If you cannot locate a shorted circuit, it may be necessary to disconnect each HO2S one at a time to locate a shorted sensor. 4. This step determines if an ignition positive voltage supply is available at the sensor.
Filed Under (GM) by admin on 20-05-2010
2001-2002 Chevrolet Camaro 2001-2003 Chevrolet Corvette 2001-2002 Pontiac Firebird 2002-2003 Cadillac Escalade, Escalade EXT
2000-2003 Chevrolet Suburban, Tahoe 2001-2003 Chevrolet Silverado 2002-2003 Chevrolet Avalanche 2000-2003 GMC Yukon, Yukon XL 2001-2003 GMC Sierra with 4.8L, 5.3L, 5.7L or 6.0L V8 Engine (VINs V, T, Z, G, S, N, U – RPOs LR4, LM7, L59, LS1, LS6, LQ9, LQ4)
Condition Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter. Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi).