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2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 07-06-04-025D Date: 100107

2010 Cadillac CTS Sedan AWD V6-3.0L Technical Service Bulletin # 07-06-04-025D Date: 100107



Fuel System - Clicking/Ticking Noises On Cold Start Up



INFORMATION



Bulletin No.: 07-06-04-025D



Date: January 07, 2010



Subject: Information on Clicking/Ticking Sound/Noise Heard During Cold Start, Sound/Noise Decreases But Continues as Engine Warms -



Normal Operation of High Pressure Fuel Pump and Injectors



Models:



2009-2010 Buick Enclave



2010 Buick LaCrosse



2008-2010 Cadillac CTS, STS



2010 Cadillac SRX



2009-2010 Chevrolet Traverse



2010 Chevrolet Camaro, Equinox



2009-2010 GMC Acadia



2010 GMC Terrain



2010 Saturn OUTLOOK



Equipped with 2.8L, 3.0L or 3.6L VVT Direct Injection V6 Engine (VINs 4, G, D, V - RPOs LAU, LF1, LLT)



Supercede:



This bulletin is being revised to include additional models and engine RPOs. Please discard Corporate Bulletin Number 07-06-04-025C (Section 06



- Engine/Propulsion System).



The 2.8L, 3.0L and 3.6L SIDI engines (RPOs LAU, LF1 and LLT) use a direct injection fuel system that operates at very high fuel pressures. A



direct injection fuel system produces a rapid clicking and ticking sound that can be heard from the engine compartment. The sound is more evident



when outside around the vehicle or when the hood is open. The sound is more noticeable during idle and is more frequent during a cold start, but



lessens once the engine is warm. The rapid ticking noise on cold start up is the fuel pump (located on the rear of the left cylinder head) building up



high fuel pressure. When the engine warm-up is completed, the high pressure fuel pump will continue to tick at a lower rate of approximately one



tick per second during idle. The clicking sound is the fuel injectors pulsing on and off under higher fuel pressures. These sounds are the results of a



normal direct injection fuel system operating properly.



DO NOT attempt to repair or replace any parts for this kind of clicking or ticking concern. The clicking or ticking sound is not indicative of any



concerns with the engine or the vehicle. You may wish to give the customer a copy of this bulletin.

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