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Info about injector/fuel system "tick"


Old 01-18-2008, 02:15 PM
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Info about injector/fuel system "tick"

Normal............if it bothers you, get over it

Document ID# 2049170


Subject: 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) #06-06-93-001C - (01/16/2008)

Models: 2008 Chevrolet HHR SS

2007-2008 Pontiac Solstice

2007-2008 Saturn Sky

2007-2008 Opel GT

2007-2008 Daewoo G2X

with 2.0L Turbo Engine (VIN X - RPO LNF)


This bulletin is being revised to add the 2008 Chevrolet HHR SS. Please discard Corporate Bulletin Number 06-06-93-001B (Section 06-Engine).

Do This
Don't Do This

Inform the customer that this is normal operation of the high pressure fuel pump and injectors.
DO NOT replace the high pressure fuel pump and or injectors.

The 2.0L turbo engine (VIN X - RPO LNF) uses 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 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.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

Copyright General Motors Corporation. All Rights Reserved.

Document ID# 2049170
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Old 01-18-2008, 07:03 PM
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My Triumph TT600 sportbike ticks very loud too. It really isnt a big deal once you get use to it.
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Old 04-02-2009, 04:55 PM
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If the ticking bothers you, here is what you can have done.
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Old 04-02-2009, 06:09 PM
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mine sounds terrible when its cold , but I had already suspected this was the deal
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Old 04-03-2009, 07:18 AM
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I hear it outside the car but not inside. It doesn't bother me. I won't be bothering my dealer over this fix.
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Old 04-03-2009, 11:34 AM
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That's funny, since just a couple days ago on a really cold morning my ticking seemed to be very loud. Good to know all is well.

Orrrrr...... is that just what they want you to think?
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Old 04-03-2009, 06:33 PM
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I have ticks.
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