2003 GMC Truck C 1500 P/U 2WD V8-5.3L VIN Engine – Knocking or Lifter Noise

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Filed Under (GMC) by admin on 02-07-2013

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GMC Truck C 1500  Engine – Knocking or Lifter Noise
: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 Inspect the 0-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual. Parts Information Parts are currently available from GMSP0. Warranty Information For vehicles repaired under warranty, use the table shown

GMC 4L80E, MT1 and 4L85E, MN8 Simplified Valve Body Reconditioning Instructions

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Filed Under (GMC) by admin on 30-06-2013

download PIP3427A – SES light on, DTC P0757, harsh shifts, delayed 2-3 shift, no third gear or slip in third or reverse, or a 2-3 shift flare. Debris stuck in the #11 check ball, or a sticking pintle in the 2-3 shift solenoid. Inspection Procedure Subject: 4L80E, MT1 and 4L85E, MN8 Simplified Valve Body Reconditioning Instructions,DTC P0741, P0742, P0751, P0752, P0756, P0757, P0894, Harsh or Delayed Shifts, Slips, No Drive, No Reverse Models: 1997-2000 Chevrolet Silverado 1997-2002 Chevrolet Silverado Chassis Cab 1997-2003 Chevrolet Express 1997-2006 Chevrolet Suburban 1997-2008 Chevrolet Express Panel, Cutaway Vans 2001-2006 Chevrolet Silverado 2500 HD, Silverado 3500 HD 2002-2006 Chevrolet Avalanche 2004-2006 Chevrolet Express 2500 HD, Express 3500 HD 2004-2008 Chevrolet W3500/4500 Series Medium Duty Tilt Cab Models 1997-2003 GMC Savana 1997-2008 GMC Savana Panel, Cutaway Vans 2001-2002 GMC Classic Sierra 3500 HD Chassis Cab 2001-2006 GMC Sierra 2500 HD, Sierra 3500 HD 2001-2007 GMC Yukon XL 2002 GMC Sierra Chassis Cab 2004-2006 GMC Savana 2500 HD, Savana 3500 HD 2004-2008 GMC W3500/4500 Series Medium Duty Tilt Cab Models 2006 GMC Yukon Denali XL 2007 GMC Savana, Savana HD, Sierra Classic HD 2001-2002 Workhorse Chassis with Hydra-Matic® 4L80-E or 4L85-E (RPO’S MT1, MN8)

1. Using the exploded view (Illus. A), inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer’s concern. IF VALVE BODY CLEANING IS NOT REQUIRED, DO NOT DISASSEMBLE BORES UNLESS IT IS NECESSARY TO VERIFY MOVEMENT OF VALVES.

2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores.

3. If a valve is restricted and cannot be corrected by cleaning the valve and bore, then replace the valve body. Describe the restricted valve on the repair order. Disassembly/Reassembly 1. If a valve is restricted by a metal burr from machining that bore, remove the valve and burr, then inspect movement in the valve’s normal position. If no other debris or restrictions are found, then reassemble the valve body and install in the transmission. 2. If the valve body has been contaminated with debris from another transmission component failure, then disassemble all bores for complete cleaning of all valve body components. Keeping individual bore parts separated will make reassembly easier. Use the following illustrations for positive identification and location of individual parts. 3. Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with compressed air. Use appropriate eye protection.

4. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore. Important: Position the valve body as shown in the following illustrations for positive identification and location of individual parts

2005 GMC Truck Sierra 1500 2WD V8-5.3L VIN Steering – Underhood Clunk Heard/Felt in Steering Wheel

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Filed Under (GMC) by admin on 30-06-2013

2005 GMC Truck Sierra 1500 2WD Underhood Clunk Heard/Felt in Steering Wheel This bulletin is being revised to add diagnostic information (refer to Diagnostic Tips) to check the lower steering column bearingas a potential source of the noise. Please discard Corporate Bulletin Number 00i02i35i003M (Section 02Steering). Condition Some customers may comment on a clunkitype noise coming from under the hood that also can be felt in the steering wheel. These conditions may be more noticeable when turning at low speeds on rough road surfaces. Diagnostic Tips Use the information below to help diagnose the source of the noise. A The lower steering column bearing may create the same noise as the intermediate shaft. Before replacing the I-shaft, verify the noise isn’t being caused by movement from the lower steering column bearing.

Check the bearing for movement by pushing up and down on the I-shaf where it attaches to the steering column Frame Snap and/or Popping Type Noise – A frame snap or popping type noise can be duplicated on rough or smooth road surfaces with steering wheel input to the left or the right. This type of noise can be HEARD and is typically louder with the windows rolled down. For additional information refer to Corporate Bulletin Number 03 -08-61-002F or newer – Snap/Popping Type Noise Coming from Front of Vehicle (Remove Front Crossmember Change Fastener Orientation).

A Intermediate Shaft Clunk – Intermediate shaft clunk is heard and FELT in the steering wheel and/or steering colummrea typically while driving on rough road surfaces with steering wheel input. C orrection DO THIS DON’T DO THIS Replace the i-Shafc with PIN 19153614. Do NOT lubricate or exercise the l$haft Important: A Iishaft P/N 19153614 has been designed to replace previous designed dampened and nonidampened Iishafts. The physical difference in the yoke size will accommodate all vehicles listed in this bulletin. A Due to the design of the new Iishaft, it is not possible to lubricatef grease the Iishaft