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2003 chevrolet 4 8l runs rough in cold weather

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2003 GMC Truck C 1500 P/U 2WD Engine Knocking or Lifter Noise

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Engine Lubrication: All Technical Service Bulletins Engine – Knocking or Lifter Noise File In Section: 06 – Engine/Propulsion System Bulletin No.: 02-06-01-038 Date: December, 2002 TECHNICAL Subject: Engine Knock or Lifter Noise (Replace 0-Ring) Models: 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). Cause The 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil. Correction

Special Coverage Adjustment – Instrument Panel Cluster Gauge Needle Function

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2003-2004 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT 2005 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT (U.S. ONLY) 2003-2004 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE 2005 CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE (U.S.ONLY) 2003-2004 GMC SIERRA, YUKON, YUKON XL 2005 GMC SIERRA, YUKON, YUKON XL (U.S. ONLY) . Install the IPC. Ensure everything is connected properly. The replacement IPC requires SPS Programming and IPC Setup procedures to be performed. It does not matter which procedure is performed first. 2. Start the engine and then select IPC Setup. You must have the engine running before performing the IPC Setup. 3. Select IPC Setup. With the engine running, enter the appropriate mileage and engine hours. 4. Select “OK”. Review the pop up asking you to verify the mileage and engine hours. Move the pop up out of the way if necessary to view the verification screen. This may require a click and drag of the dialog box. 5. Verify that the mileage and engine hours are correct and select “OK”. DO NOT turn the ignition OFF until the engine has “run” for approximately seven (7) minutes. Allowing the engine to idle for this period of time allows the IPC to accumulate 1/10th of an hour and write the correct engine hour value to the permanent memory. The engine must be running before set up is performed and run for approximately seven minutes after the user selects “OK” confirming their mileage/engine hour inputs. After approximately seven minutes, shut the engine OFF and complete the event. The seven minute clock starts after you select “OK”, confirming the entries. Note: Based on feedback from technicians, we are currently making changes to the “IPC Setup” application which will include several enhancements to the set up screens. These are scheduled to be released and available in TIS2WEB very soon. Important: Only IPC conditions listed in the Condition section of the bulletin are covered under this special coverage program. In a small number of vehicles, the condition may be intermittent and the gauge sweep test may not always verify the condition. IPC Performance IPC performance may be affected by the following conditions: Customer Comments and Observations Customers who describe gauge performance as jumpy, sticky, slow or erratic. Gauge performance may also be described as being inoperative or inaccurate. For example, for a period of time the speedometer may appear to move normally but be inaccurate and not return to zero (0) after the vehicle comes to a stop. This inaccurate condition may be more or less pronounced during the drive cycle and may, for a time, return to normal operation. A Tech 2 sweep test may not reveal the condition. 1. Perform a gauge sweep test to determine/verify that an IPC gauge is sticking, stuck, or inoperative. Using the Tech 2, navigate to the following screens to perform the gauge sweep test: Body -> Instrument Panel Cluster -> Special Functions -> IPC Gauges -> Display(s) Test. • Cold temperatures • Temperature fluctuations • High humidity • Driving over rough surfaces such as dirt roads or potholes

LM7, L59 or L33 Engines with Cold Start Rough or Incorrect Idle, Misfire, Malfunction Indicator Lamp (MIL) or Flashing Requiring O2 Sensor Replacement

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2004-2005 Cadillac Escalade 2004-2005 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe 2005 Chevrolet Silverado Hybrid (HP2) 2004-2005 GMC Sierra 1500, Yukon, Yukon XL 2005 GMC Sierra Hybrid (PH2) with Vortec 5300 5.3L V-8 Engine (VINs T, Z, B — RPOs LM7, L59, L33 Some customers may comment on a Malfunction Indicator Lamp (MIL) On or that the MIL is flashing. An actual engine misfire may or may not be felt along with an incorrect idle speed. Typically this occurs during cold winter months, on cold engine starts. Some vehicles may have been previously serviced for the same condition. Technicians may also find the following DTCs stored with the Tech 2® P0131, P0133, P0134, P0137, P0138, P0140, P0151, P0153, P0154, P0157, P1133, which may be in conjunction with P0171, P0174, P0300 and P1138. Cause Water shock occurs when water droplets are present in the exhaust. The water in the exhaust contacts the sensor element inside the HO2 sensor, causing the HO2 sensor element to crack. Correction Upon diagnostic investigation, the technician may find that the HO2 sensor requires replacement. In addition to replacing the affected HO2 sensor, these vehicles should also be reflashed with the latest PCM calibration. An updated PCM calibration will be available to dealerships as part of TIS 2000 incremental satellite update 11.0 (NAO version 25.010) or greater. Always, make sure your Tech 2 is updated with the latest software version

2003 Mercedes Benz CLK 500 Engine Controls Cooling Fan Runs Continuously

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Engine Fan Runs Constantly If you receive customer reports in the above model vehicles of the engine fan running constantly with code P2073(004) Electric fan for engine & AC, open circuit; this may be caused by the wiring harness between the ECU and the engine fan or the engine control unit fan end stage malfunctioning. To resolve, perform the below procedure. Note: Only vehicles as outlined in Service Campaign Bulletin No. 2003110006 are affected, see vehicle range shown. When performing Service Campaign Bulletin No. 2003110006 only, the engine ECU does not need to be exchanged. All engine ECUs exchanged under warranty for the above condition must be accompanied by the freeze frame data for the respective DTC. Claims submitted without this information will be debited back to the dealer Remedy: 1) Check wiring harness between engine ECU connector (pin 39) and engine fan connector (pin 4) for continuity. IF OK, proceed as follows. 2) Replace engine control unit (AR07.08-P-7008P) 3) Install adapter harness a. Remove lower underbody panel b. Disconnect engine wiring harness plug from engine fan C. Connect adapter wiring harness between fan connector and engine wiring harness. d. Secure adapter wiring harness with loom ties (Figure 1). e. Secure adapter wiring harness plug to engine fan (Figure 2)

2000-2002 Toyota Corolla, Celica, MR2 Spyder, and ECHO DTC P1349 – VVTi ACTUATOR Repair Manual

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TC P1349 – VVTi ACTUATOR – EG009-03 May 19, 2003 Page 3 of 4 1. Inspect the condition of the valve cover oil baffle as per TSB EG007-02. If camshaft or camshaft position sensor damage resulting from a bent baffle is identified, repair the damage as necessary. 2. Make sure the vehicle is in “PARK” with the engine idling. 3. Referring to the screen flow below, connect the Toyota Diagnostic Tester to the vehicle and select the VVT Control Bank One Active Test (VVT CTRL B1) from the Active Test Menu. 1: DATA LIST 2: DTC INFO 3: 4: SNAPSHOT 5: SYSTEM CHECK 6: RESET MEMORY 7: MONITOR INFO 8: CHECK MODE SELECT DATA B DIAGNOSTIC MENU ENGINE A C INJ VOL A/F CONTROL CAN CTRL VSV TANK BYPASS VSV EVAP VSV (ALONE) A/C MAG CLUTCH FUEL PUMP/SPD LINE PRESS UP VVT CTRL B1 Confirm that the Vehicle is Stopped And Engine Idling 3: ACTIVE TEST PRESS [ENTER] INJECTOR 3.5ms IGN ADVANCE 11.0deg CALC LOAD 22% MAF 3.68gm/s ENGINE SPD 684rpm COOLANT TEMP186.8F INTAKE AIR 129.2F THROTTLE POS 14% CTP SW ON VEHICLE SPEED0MPH O2S B1S2 0.82V AFS B1 S1 3.25V SHORT FT #1 1.5% LONG FT #1 5.4% TOTAL FT #1 1.08 E D VVT CTRL B1 OFF INJECTOR 8.3ms IGN ADVANCE 5.0deg CALC LOAD 0% MAF 0.00gm/s ENGINE SPD 0rpm COOLANT TEMP186.8F INTAKE AIR 129.2F THROTTLE POS 14% CTP SW ON VEHICLE SPEED0MPH O2S B1S2 0.33V AFS B1 S1 3.29V SHORT FT #1 -0.1% LONG FT #1 5.4% TOTAL FT #1 1.08 VVT CTRL B1 ON 4. Using the right arrow key, toggle the VVTi actuator “ON.” 5. If at this point the vehicle does not run rough and/or stalls when the active test is performed, proceed with Repair Manual P1349 VVTi Fault Isolation Procedure (FIP). If the vehicle does stall and/or runs rough, this indicates the the VVTi control system is operating. Proceed to replace the VVTi actuator following the repair procedures listed on the Technical Information System (TIS): Engine Mechanical Section, Camshaft, Replacement The camshaft timing gear should come in the unlocked position from the factory. If it is difficult to install the camshaft timing gear, the lock pin may be engaged. To disengage the lock pin, apply and hold approximately 20 psi of air pressure at the oil feed hole located 90 degrees clockwise of the oval slot. (See Figure 1.) Once the pin has released, turn the interior assembly counterclockwise. (See black arrow in Figure 1.) B. Put the camshaft timing gear assembly and the camshaft together with the straight pin off the key groove. C. Turn the camshaft timing gear assembly (as shown in Figure 2) while pushing it lightly against the camshaft. Push further at the position where the pin fits into the groove. NOTE: Be sure not to turn the camshaft timing gear to the retard angle side (in the clockwise direction). D. Check that there is no clearance between the end of the camshaft and the camshaft timing gear. E. Tighten the camshaft bolt with the camshaft timing gear fixed. Torque: 54 Nm (551 kgfcm, 40 ftlbf) F. Check that the camshaft timing gear assembly can move to either side and is not locked