Last post on Oct 05, 2011 at 12:06 PM
You are in the Buick LaCrosse
What is this discussion about?
Buick LaCrosse, Sedan
#13 of 16 Re: Another thread on the rattle at start [ar15]
Sep 09, 2011 (7:21 am)
I looked at both videos. The quality of the sound, lacking stereo, and any directionaly makes it hard to discern. There is obviously something that does not sound normal.
In one of the videos, it sounded as if the AC pump kicked in after a couple of seconds and too did not sound right. Really hard to say they are two separate sounds or a combination. If the pump is making that sound, it sounds like it is on its way out. You definitely should not hear a rattling sound from the AC system. Is it possible that a bracket or such is loose?
Does the sound seem to be internal? My next guess would be that the VVT system is involved. Possibly not getting enough oil flow/pressure to the valve train and timing mechanism upon start. Or the VVT system is being slow to settle into a smooth timing position.
Does it only happen on cold start? What happens on a restart, cold or hot?
Have you tried different fuels?
As I said, hard to tell from video, but I wonder if it could be the exhaust resonating in the front part of the exhaust system. Unlike previous EGR systems, this one works by keeping the exhaust valves open extra long, into part of the intake stroke and sucking some of the expelled exhaust back into the engine. That is you are suddenly reversing the flow of the exhaust. Have you ever heard water pipes hammer when you rapidly close a faucet?
Does it sound like the noise may be coming from the pre-converter located immediately off the exhaust manifold? The catalytic material inside may be vibrating until the heat expands everything to a tight fit. And if that is the situation, it probably will get worse with time, over the years.
#14 of 16 Possible solution
Sep 28, 2011 (6:51 am)
Gm has a recall 1119A that looks like it addresses the problem. I have made an appointment to have mine looked at. Here's the recall details:
This bulletin has been revised to include parts, service procedure, and labor time for
repairs to customer vehicles. Please discard all copies of bulletin 11195, issued June
Recall 11195A applies to:
2011 Buick LaCrosse, Regal
2011 Chevrolet Equinox
2011 GMC Terrain
Equipped with a 2.4L Gas Engine (LAF)
Other pertinent data from the Recall:
Please read Line Item #5
This simply notes the States whose Emission Laws require that an Emission Recall Correction Sticker must be afixed to the vehicle upon completion of the work. Please note that in addition to the sticker, in California a Certificate of completion is also required...as noted at the bottom of the Recall notice.
Line Item #5 should NOT be construed as to limit the scope of correction to those states. That is why it is listed after the repair procedures.
General Motors has decided to conduct a Voluntary Emission Recall involving certain 2011
Buick LaCrosse, Regal; Chevrolet Equinox; and GMC Terrain vehicles equipped with a 2.4L
gas engine (LAF). On these vehicles, the camshaft position actuator solenoid may stick,
resulting in the illumination of the malfunction indicator light, rough idle, poor driveability,
and/or possible stalling at low throttle opening.
Dealers are to reprogram the engine control module, and if necessary, replace the camshaft
position actuator solenoid valves.
Involved are certain 2011 model year Buick LaCrosse, Regal; Chevrolet Equinox; and GMC
Terrain vehicles equipped with a 2.4L gas engine (LAF).
Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the
Required Field Actions section in the Global Warranty system. Not all vehicles
may be involved.
For dealers with involved vehicles, a listing with involved vehicles containing the complete
vehicle identification number, customer name, and address information has been prepared
and will be provided to US and Canadian dealers through the GM GlobalConnect Recall
Page 2 August 2011 Bulletin No.: 11195A
Reports, or sent directly to export dealers. Dealers will not have a report available if they
have no involved vehicles currently assigned.
The listing may contain customer names and addresses obtained from Motor Vehicle
Registration Records. The use of such motor vehicle registration data for any purpose other
than follow-up necessary to complete this recall is a violation of law in several
states/provinces/countries. Accordingly, you are urged to limit the use of this report to the
follow-up necessary to complete this recall.
Parts required to complete this recall are to be obtained from General Motors Customer Care
and Aftersales (GMCC&A). Please refer to your “involved vehicles listing” before ordering
parts. Normal orders should be placed on a DRO = Daily Replenishment Order. In an
emergency situation, parts should be ordered on a CSO = Customer Special Order.
Part Number Description Quantity/Vehicle
12628347 Valve, Cm/Shf Posn Actr Int Sol 1 (If Req'd)
12628348 Valve, Cm/Shf Posn Actr Exh Sol 1 (If Req'd)
1. Determine the vehicle status.
If the vehicle is still in dealer inventory, reprogram the ECM with the latest calibration.
Refer to ECM Programming in this bulletin. Do NOT replace the camshaft position
actuator solenoid valves.
If the vehicle has been delivered to the customer, reprogram the ECM and replace the
camshaft position actuator solenoid valves. Refer to Engine Controls - Camshaft
Position Actuator Solenoid Valve Replacement in SI.
Do not attempt to order the calibration number from GM Customer Care and Aftersales. The
calibration numbers required for this service procedure are programmed into control modules
via a Multiple Diagnostic Interface (MDI) or Tech 2® diagnostic scan tool and TIS2WEB with
the calibration update. Use TIS2WEB on or after 6/23/11 to obtain the calibration. If you
cannot access the calibration, call the Techline Customer Support Center at 1-800-828-6860
(English) or 1-800-503-3222 (French) and it will be provided. Make sure your Tech 2®
diagnostic scan tool is updated with the latest software version or verify that the multiple
diagnostic interface (MDI) that is being used is configured to the PC that will be used. Clear
any codes and verify the condition has been corrected.
For step-by-step programming instructions, please refer to SI and the Techline Information
System (TIS) terminal.
1. Verify that there is a battery charge of 12 to 15 volts. The battery must be able to
maintain a charge during programming. Only use an approved Midtronics® PSC 550
Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent to maintain
proper battery voltage during programming.
Page 3 August 2011 Bulletin No.: 11195A
2. Reprogram the engine control module (ECM). Refer to SI and Service Programming
System (SPS) documentation for programming instructions, if required.
2.1 Connect the MDI to the vehicle. Connect the MDI to the programming terminal with
a cable (USB or LAN).
2.2 Select J2534 MDI and Reprogram ECU from the Select Diagnostic Tool and
Programming Process screen.
2.3 Select ECM Engine Control Module—Programming from the Supported Controllers
2.4 Follow the on-screen instructions.
3. Clear all DTCs.
4. If the vehicle has been delivered to the customer, replace the camshaft position actuator
solenoid valves. Refer to Engine Controls - Camshaft Position Actuator Solenoid Valve
Replacement in SI.
5. CALIFORNIA, CONNECTICUT, MARYLAND, MASSACHUSETTS, MAINE, OREGON,
VERMONT, & WASHINGTON vehicles only: Install a Recall Identification Label.
RECALL IDENTIFICATION LABEL - California/Connecticut/Maryland/Massachusetts/Maine/
Oregon/Vermont/Washington Vehicles Only
Place a Recall Identification Label on each vehicle corrected in accordance with the
instructions outlined in this Product Recall Bulletin. Each label provides a space to include
the recall number and the five-digit dealer code of the dealer performing the recall service.
This information may be inserted with a ballpoint pen.
Put the Recall Identification Label on a clean and dry surface of the
radiator core support in an area that will be visible to people servicing
When installing the Recall Identification Label, be sure to pull the tab to
allow adhesion of the clear protective covering. Additional Recall
Identification Labels for US dealers can be obtained from Dealer Support
Materials by ordering on the web from DWD Store,
www.gmdealerworld.com, and then click on the DWD Store link.
Request Item Number S-1015 when ordering.
DEA LER CODE
DO NOT REMOVE
COURTESY TRANSPORTATION – For US and C
#15 of 16 recall 11195A
Sep 30, 2011 (11:15 am)
I just had recall 11195A performed on my LaCross yesterday, and so far so good. I'll post back if the situation, with the rattling at start up, occurs again.
#16 of 16 Re: Possible solution [ar15]
Oct 05, 2011 (12:06 pm)
My problem is fixed. It hasn't occurred again after almost a week of driving.