Joined
·
29 Posts
Hi all. I took the car in to my local GM dealership due to a tick sound when I started the car in the cold. The usual sign, makes a tick and then when it warms up it goes away.
It took a couple of tries but the dealership did confirm the tick however they told me that the noise is normal for these engines and attached the below
explanation to my service order:
Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000♦km (12,000-15,000♦mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30♦seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
I thought great no problem just another weird thing the engine does. Then today it's a warm day, I pick up my car from the airport after flying in from a day trip and I hear the tick again at start up for 2-3 minutes. So I looked up if the AFM Causes the engine to tick in google and found the bulletin that he copied from, its attached below. The engines listed are the models below with the same description of t.he tick noise.
#01-06-01-028B: Engine Knock on Cold Start - (Oct 3, 2011)
Subject: Engine Knock on Cold Start
Models: 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models
2002 Cadillac Escalade (2WD)
Equipped with 4.8L, 5.3L or 6.0L Engine (RPOs LR4, LM7, L59, LQ4)
2007-2012 Cadillac Escalade Models
2007-2012 Chevrolet Silverado
2007-2012 GMC Sierra, Yukon Denali, Yukon XL Denali
Equipped with 6.2L Engine (RPOs L92, L94, L9H)

This bulletin is being revised to update the Models section. Please discard Corporate Bulletin Number 01-06-01-028A (Section 06 – Engine/Propulsion System).

Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000♦km (12,000-15,000♦mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30♦seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
Obviously I found the TSB for our engines right under the link for this one. My question is did anyone else have this told to them and then took their car back to get the lifters replaced? My car is still under warranty and want to make sure it doesn't fail due to a bad diagnostic by the technician. I know GM service read these posts and would also like their opinion. Should I take it back and this time show them the TSB, I'm a little concerned now?
Thanks everyone for the advise.
It took a couple of tries but the dealership did confirm the tick however they told me that the noise is normal for these engines and attached the below
explanation to my service order:
Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000♦km (12,000-15,000♦mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30♦seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
I thought great no problem just another weird thing the engine does. Then today it's a warm day, I pick up my car from the airport after flying in from a day trip and I hear the tick again at start up for 2-3 minutes. So I looked up if the AFM Causes the engine to tick in google and found the bulletin that he copied from, its attached below. The engines listed are the models below with the same description of t.he tick noise.
#01-06-01-028B: Engine Knock on Cold Start - (Oct 3, 2011)
Subject: Engine Knock on Cold Start
Models: 1999-2002 Chevrolet and GMC C/K Pickup and Utility Models
2002 Cadillac Escalade (2WD)
Equipped with 4.8L, 5.3L or 6.0L Engine (RPOs LR4, LM7, L59, LQ4)
2007-2012 Cadillac Escalade Models
2007-2012 Chevrolet Silverado
2007-2012 GMC Sierra, Yukon Denali, Yukon XL Denali
Equipped with 6.2L Engine (RPOs L92, L94, L9H)

This bulletin is being revised to update the Models section. Please discard Corporate Bulletin Number 01-06-01-028A (Section 06 – Engine/Propulsion System).

Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000♦km (12,000-15,000♦mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30♦seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
Obviously I found the TSB for our engines right under the link for this one. My question is did anyone else have this told to them and then took their car back to get the lifters replaced? My car is still under warranty and want to make sure it doesn't fail due to a bad diagnostic by the technician. I know GM service read these posts and would also like their opinion. Should I take it back and this time show them the TSB, I'm a little concerned now?
Thanks everyone for the advise.