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Subject: Models: EI10035 — Engineering Information –Front Suspension Noise, Clunk, Popping, Rattle 2010 Chevrolet Camaro Condition Important: If the customer did not bring their vehicle in for this concern, DO NOT proceed with this PI. Some customers may comment on a noise coming from the front suspension. Description of the noise can include suspension clunk, popping or rattle. Upon further inspection, the noise can be generally traced to the front strut assembly. Strut assembly components, including struts and top mounts, returned under warranty have been tested with no trouble found. Cause GM Engineering is attempting to determine the root cause of the condition above. Engineering has a need to gather information on vehicles PRIOR to repair that may exhibit this condition. As a result, this information will be used to “root cause” the customer’s concern and develop/validate a field fix.

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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.

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Except Air-Conditioned Cars 1967 MODELS 1. Disconnect the negative battery cable and drain the radiator. 2. Remove the heater hoses from the core. The top hose connects to the water pump and the lower hose goes to the thermostat housing or intake manifold. 3. Remove the cables and all electrical connections from the heater and defroster assembly. 4. Remove the nuts from the core case studs located on the firewall. 5. From inside the car, remove the case-to-firewall mounting screws and the heater and defroster assembly. 6. Remove the retaining springs and core. 7. Install the core and retaining springs, making sure the core-to-case sealer is in good condition. 8. Complete the installation by reversing the removal procedure. 1968-77 MODELS 1. Disconnect the negative battery cable. 2. Drain the radiator. 3. Disconnect the heater hoses. Plug the core inlet and outlet. 4. Remove the nuts from the air distributor duct studs on the firewall. 5. On 1970-77 Camaros: remove the glove box and radio, then the defroster duct-to-distributor duct screw. Pull the defroster duct out of the way, then pull the distributor duct from the firewall mounting. Remove the resistor wires. Lay the duct on the floor. 7. Remove the core assembly from the distributor duct. 8. Reverse the procedure to install. Use new sealer on the duct flange, if necessary.

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When the key is first turned ON, without the engine running, the ECM will turn the fuel pump relay ON for two seconds. This builds up the fuel pressure to normal operating pressure. If the engine is not started within two seconds, the ECM will shut the fuel pump OFF and wait until ignition reference pulses are present. As soon as the engine is cranked, the ECM turns the relay ON, which powers the fuel pump. The ECM continues to power the fuel pump during engine operation. If the fuel pump relay fails, it is backed up by the oil pressure switch, which continues to operate the fuel pump as long as oil pressure remains above 28.0 kPa (4 psi). A faulty fuel pump relay can result in long cranking times, particularly if the engine is cold. An inoperative fuel pump would cause a no start condition. A fuel pump which does not provide enough pressure can result in poor performance.

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Exhaust System Installation 1. Place removed OE exhaust system on the ground and using this as a reference, arrange components of new exhaust (figure 6). 2. Place a clamp over the expanded end of the R/H Front Pipe and fit on right-side exhaust. Place a clamp over end of X-Pipe Assembly and fit into R/H Front Pipe (figure 7) . Verify orientation of X-Pipe Assembly with curvature as shown (figure 8). Do Not tighten the clamps. Repeat for L/H Front Pipe. 3. Place a clamp over the expanded end of R/H Intermediate Pipe Assem- bly and set it into position as shown in figure 6 making sure to install the hangers into the rubber isolators. Do Not tighten the clamp. Repeat for L/H Intermediate Pipe Assembly. 4. Install OE crossbrace support using original hardware. (figure 9) 5. Assemble R/H Rear Muffler Assembly making sure to install the han- gars into the rubber isolators (figure 10) and at mufflers. Repeat for the L/H Rear Muffler Assembly. Check your exhaust system for proper clearance under the vehicle and also for tip alignment. (figure 11) 4. Once position has been determined to be correct, tighten the Ac- cuseal™ clamp to 32-35 ft. lbs. making sure the clamps openings are not over any of the notches in the pipes. Tighten the flange hardware to 18-22 ft. lbs. 5. Before starting your vehicle, make sure to check all wires, hoses, brake lines, body parts and tires for safe clearance from the exhaust system. 6. Start vehicle and check for any leaks. If any leaks are found, determine cause (such as loose hardware or incorrectly positioned clamp) and re- pair as necessary.