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Heat Shield Buzz Heard While Driving GM Trucks

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Heat Shield Buzz Heard While Driving GM Trucks

Some customers may comment on a pinging popping snapping noise from underneath the vehicle at idle or immediately after the vehicle is shut off. Pinging popping snapping noise: from the exhaust system during cool down is a normal condition. The noise may be intermittent depending on the outside temperature and or temperature of the exhaust system at the time of testing. Some customers may also comment on a buzz noise coming from the muffle: during vehicle operation.

Cause:

Exhaust Pinging/Popping/Snapping
As the exhaust system cools, the muffler shell and muffler internals contract at different rates. Pinging popping snapping noise from the exhaust system during cool down is a normal condition.

Why Muffler Buzz
If the muffler heat shield straps are loose, the heat shield may be free to buzz.

Correction

DO NOT REPLACE THE EXHAUST SYSTEM COMPONENTS.
Exhaust Pinging/Popping/Snapping Noise, This condition is normal to the muffler design and does not indicate poor quality or part failure.

Confirm Muffler Buzz

Confirm the origin of the buzz by shimming (use metal shims) the straps tight and start the engine, if the buzz concern is gone, then it is caused by the loose shield. Using the following procedure, install new straps to secure the heat shield to the muffle:.

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in Owners Manual.

Heat Shield Buzz Heard During Vehicle Operation on GM Trucks
Auto Muffler Strap

2. Mark the position of the heat shield (1) and straps (2) on the muffler shell.

Mark the position of the heat shield
Vehicle’s heat shield – Remove Muffler Strap

3. Cut and remove the heat shield straps using tin snips along the muffler shell seam (1), and remove the shield from the muffler.

4. Position the heat shield to the muffler and install new heat shield straps on the muffler shell in the positions marked prior to removal.

Position the heat shield to the muffler and install new heat shield straps
Install New Muffler Straps

Important

Do Not position the strap screw heads directly across from the propeller shaft. Ensure the strap heads are positioned below the midpoint of the muffler. Position the strap screw heads (1) on the inboard side of the muffle:. Ensure that the strap screw heads (1) are below the midpoint of the muffler. Tighten the straps to 4 Nm (35lb.in). Cut off the excess strap material and ensure that the ends (2)are flat against the muffler.

Parts Information

Part Number:#10391259

Description: Strap, Exhaust Muffler Heat Shield

Qty: 2 or 3

Subject: V8 Engines:
Muffler Heat Shield Buzz During Vehicle Operation or Exhaust Pinging Popping Snapping Noise (Normal Condition) When Vehicle is Hot, at Idle, or Immediately After Vehicle is Shut Off’ (Perform Repair as Outlined Below)

Models:

2007-2011 Cadillac Escalade. Escalade Hybrid Escalade ESV, Escalade EXT
2007-2011 Chevrolet Avalanche. Silverado. Suburban. Tahoe, Tahoe Hybrid
2007-2011 GMC Siena, Sierra Denali, Yukon, Yukon Hybrid Yukon XL, Yukon Denali, Yukon Denali XL

Equipped with the following V8 Engines:

  • 4.8E RPO LY2, L20)
  • 13E RPOs E9, LH6, EMG, LYS)
  • 6.0E (RPOs EFA, EY6, LZ1, L96)
  • 6.2L (RPOs E9H, L92, L94)

Please Refer to GWI1IVH

For all your automotive needs go to www.autohelprepair.us. We are an On Line Repair Service helping Professionals, Do it yourselfers, and the Beginners in aiding with Auto Repair and Diagrams, for Domestic and Import cars, trucks, and vans.

2010-2012 ALTIMA Rear End Clunking Knocking On Bumps

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Coil Spring Noise over Bumps

 

2010-2012 ALTIMA COUPE NOISE FROM REAR SUSPENSION OVER BUMPS

 

IF YOU CONFIRM:

There is a noise (clunking, knocking or popping) from the rear suspension area when
going over bumps or on uneven roads. [Read more…]

MAF SENSOR or IGNITION CONTROL MODULE TESTING

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MAF-SENSOR-OR-IGNITION-CONTROL-MODULE-TESTING

MAF SENSOR or IGNITION CONTROL MODULE TESTING

How to test a MAF SENSOR or an IGNITION CONTROL MODULE, you’ll hear plenty of specific articles that will guide you step by step through the test. Whether it’s FORD or a HONDA or any of the GENERAL MOTORS makes, you’ll find them here and others. [Read more…]

Positive Crankcase Ventilation Valve Problems

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Positive Crankcase ventilation valve problems

Positive Crankcase ventilation valve problems, Incorrect PCV valve, Rough Idle, Surging engine, Stalling engine, Sticking throttle plate, Excessive oil consumption, PCV System Functional Tests [Read more…]

AIR CONDITIONING ODOR

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Eliminate A/c odors

AIR CONDITIONING ODOR

 

CONDITION

Some customers may comment about musty odors emitted from the Heating, Ventilation and Air Conditioning (HVAC) system at vehicle start-up in hot: humid conditions.

This condition may be caused by condensate build-up on the evaporator core: which does not evaporate by itself in high humidity conditions. The odor may be the result of microbial growth on the evaporator core. When the blower motor fan is turned on: the microbial growth may release an unpleasant musty odor into the passenger compartment.

There are several other possible sources of a musty odor in a vehicle. A common source is a water leak into the interior of the vehicle or foreign material in the HVAC air distribution system. Follow’ the procedures in SI for identifying and correcting water leaks and air inlet The procedure contained in this bulletin is only applicable if the odor source has been determined to be microbial growth on the evaporator core inside the HVAC module. [Read more…]

Pontiac Torrent Engine Overheating

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ENGINE OVERHEATING
 DEFINITION: The engine temperature lamp comes on and stays on: the temperature gauge shows hot or coolant overflows from the coolant recovery reservoir onto the ground while the engine is running.
Step Action Value(s) Yes No
1

 Check for a loss of coolant. Has there been a loss of coolant?

 –

 Go to Step 2

 Go to Step 3
2

 Refer to Loss of Coolant.
Does the engine still overheat?

 –

 Go to Step 3

 System OK
3

 

 Check for a loss of system pressure. Use the J 24460-01 Cooling System Pressure Tester. See Special Tools.
Has there been a loss of system pressure?

 – Go to Step 4

 Go to Step 5
4

 Correct the system pressure.
Does the engine still overheat?

 – Go to Step 5

 System OK
5

 
  1. Check for low coolant protection.
  2. Make sure that the solution is at the specified temperature.
    Is there low coolant protection?

 -37 C (-34°F)

 Go to Step 6

 Go to Step 7
6

 Correct as necessary. Does the engine still overheat?

 –

 Go to Step 7

 System OK
7
  1. Check the accessory drive belt tension.
  2. Check the tensioner. Refer to Drive Belt Tensioner Diagnosis in Engine Mechanical – 3.4 L.
    Is thetensioner working properly and the tension correct?

 –

 Go to Step 9

 Go to Step 8
8

 Replace the tensioner. Refer to Drive Belt Tensioner Diagnosis in Engine Mechanical – 3.4 L.
Does the engine still overheat?

 –

 Go to Step 9

 System OK
9

 Check to see if the timing is retarded by a malfunctioning powertrain control module (PCM).
Is the timing retarded by a malfunctioning PCM?

 –

 Go to Step 10

 Go to Step 11
10

 Correct as necessary. Does the engine still overheat?

 –

 Go to Step 11

 System OK
11

 Check to see if any of the radiator fins are obstructed.
Are any of radiator fins obstructed?

 –

 Go to Step 12

 Go to Step 13
12
  1. Remove or relocate any add-on parts that block air to the radiator.
  2. Remove any debris from the radiator fins.

Does the engine still overheat?

 –

 Go to Step 13

 System OK
13

 Check to see if any of the cooling system passages are blocked by rust or scale.
Are any of the cooling system passages blocked by rust or scale?

 –

 Go to Step 14

 Go to Step 15
14

 

 

 
  1. Drain the cooling system. Refer to Draining and Filling Cooling System (Static Fill) or Draining and
    Filling Cooling System (GE 47716 Fill).
  2. Flush the cooling system. Refer to Coolant System Flushing.
  3. Repair as necessary.

Does the engine still overheat?

 –

 Go to Step 15

 System OK
15

 Check for a pinched or kinked coolant recovery reservoir hose.
Is the surge tank hose pinched orkinked?

 –

 Go to Step 16

 Go to Step 17
16

 Replace or reroute the hose as necessary. Refer to Surge Tank Hose/Pipe Replacement – Inlet.
Does the engine still overheat?

 –

 Go to Step 17

 System OK
17

 Check for an inoperative cooling fan. Refer to Cooling Fan Inoperative in Engine Cooling.
Are there any inoperative cooling fans?

 –

 Go to Step 18

 Go to Step 19
18

 Repair or replace the electric cooling fans as necessary. Refer to Cooling Fan Motor Replacement – Electric.
Does the engine still overheat?

 –

 Go to Step 19

 System OK
19 Check for a loose, damaged, and/or missing deflector.
Are there any loose, damaged, or missingdeflectors?

 –

 Go to Step 20

 Go to Step 21
20

 Replace the deflectors. Does the engine still overheat?

 –

 Go to Step 21

 System OK
21

 Check to see if the thermostat is stuck in the closed position.
Is the thermostat stuck in the closedposition?

 –

 Go to Step 22

 Go to Step 23
22

 Replace the thermostat. Refer to Thermostat Replacement.
Does the engine still overheat?

 –

 Go to Step 23

 System OK
23

 Check for a faulty coolant pump.
Is the coolant pump faulty?

 –

 Go to Step 24

 Go to Step 25
24

 Replace the water pump. Refer to Water Pump Replacement.
Does the engine still overheat?

 –

 Go to Step 25

 System OK
25

 Check for an incorrect radiator.
Is the radiator correct?

 –

 Go to Step 26
26

 Install the correct radiator. Refer to Radiator Replacement.
Does the engine still overheat?

 – _ System OK

Pontiac Torrent Engine Overheating

Tinnerman Nuts Do they need to be Used

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Tinnerman Nuts Do they need to be Used

Tinnerman Nut Do They Need To Be Used

Tinnerman Nut

Tinnerman nut is used to hold the brake rotors in place as it goes down the assembly line. The nuts should never be replaced after the brake rotor is turned, or replaced.  Tinnerman nuts can cause problems on newer vehicles if new  rims are put on the vehicle.Most performance or aftermarket  rims do not have relief cut into the seats to accommodate this thin nut. The driver may report a vibration in the steering wheel or the brake pedal if the Tinnerman nut is left on the vehicle.

Note: If new rims are to be put on your car, or truck, , have the Tire Technician remove the nuts to all four wheels before rims are installed.

 

History:

Tinnerman was founded in Cleveland, Ohio in 1870 by George Tinnerman. It was known as the Tinnerman Stove Company, makers of high-end stoves. In 1936, Albert, George’s son, created a spring steel fastener known as the “Speed Nut®” in order to solve an ongoing issue with stove shipping. From that day, the business expanded in a whole new direction serving multiple industries. George Tinnerman, grandson of the founder, commercialized Speed Nuts in markets beyond stoves – so successful in fact that the stove business shut down entirely. Tinnerman became the supplier of fasteners for 100% of WWII Aircraft.

According to a 1947 Fortune Magazine article, the Tinnerman Company used aggressive techniques to change the automotive industry. The time saving fasteners held parts in place without the need for welding or riveting. At the time, an automobile manufacturer doubted that it was strong enough to hold fenders to bodies. A.H. Tinnerman responded by hoisting a 3,325-pound Plymouth off the ground supported by a Speed Nut. A.H. also created a plan to save Ford millions of dollars by changing the way automobiles are created – finding 400 unique places and application for Tinnerman products. It became an automotive revolution.

By Master Tech Lee

Do I Need Oil Change Every 3000 Miles

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Do I Need Oil and Filter Change Every 3000 Miles

With today’s oil technology, along with the new engine and fuel delivery technology, this is a question that gets asked more often than one thinks. Oil manufacturers have made huge breakthroughs in oil technology. This has allowed engine designers to make some very significant engine design breakthroughs. I personally use full synthetic oil in all my vehicles and a high quality oil filter and change my oil every 5,000 miles. I do not use the month’s method just miles traveled. Every vehicle in my fleet has over 200,000 miles on them and still performing at peak efficiency! Let’s face it, the cost of ownership for a vehicle plays a big role in the wallet.

The 3000 mile or 3 month oil change standard is a leftover from the days of sloppy fuel systems and old engine designs. Today’s engines are fitted with Sequential fuel injection systems and computer control timing. The amount of blow-by and fuel leaching into the crankcase, engine oil is virtually none existing. This alone was one of the major reasons for short oil changes. Engine sealing against moisture entering these new engine designs has been greatly improved. The Positive Crankcase Ventilation system (PCV) and increased engine operating temperatures have improved moisture control in the oil. This is all in place before the oil formula itself is managing all these engine and oil killing elements. A good oil filter will assist with keeping things clean and in order.

The benefit to using high quality synthetic oil is lower operating cost and longer engine life. If you operate your vehicle for the national average of 15,000 miles a year that’s three full synthetic oil changes a year. A full synthetic oil change average cost is $50.00. At only three a year that is $150.00 for maximum protection. Let’s look at the 3,000 miles or three months oil change we are being sold on. The average cost of none synthetic oil changes is about $30.00. You would need 5 oil changes a year if you operated your vehicle 15,000 miles. This would mean 5 trips to the service center. The cost would be $150.00 for the 5 oil changes at $30.00 per service. If you service the vehicles yourself like I do, you can get a full synthetic oil/filter change done for around $25.00. That would be $50.00 a year in oil changes. In my busy life, two less trips to the service center is time spent doing the thing I love to do. Time in my busy schedule is precious and in short amount. So the choice is yours, every 3,000 or 3 months with conventional oils or every 5,000 miles with full synthetic.

Do I Need Oil Change Every 3000 Miles

 

Todays vehicles are the safest to date

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Todays vehicles are the safest

Todays vehicles are the safest to date

Need Help? Ask A Technician Now!

 

 

Todays vehicles are the safest to date for operators, passengers, and pedestrians. The technology used in braking, suspension and accident avoidance is awesome. If you are operating a vehicle that is more than 10 years old on a daily bases you are missing out on some awesome technology. These vehicles require some special repair and maintenance handling by the repairer. Some even require specialized alignment equipment and procedures to restore the vehicle to its design operation.
If your vehicle is equipped with drive by wire (DBW), steer by wire (SBW), Vehicle Skid Control (VDC), Anti-lock Brakes (ABS) you have a vehicle that needs extra procedures during a wheel alignment. These vehicles use steering wheel angle sensors that detect and report steering wheel position to the computer system. They also use sensors that detect pitch and yaw of the vehicle. This is the feeling you get when you apply the brakes and feel the vehicle come upward from the rear and watch the front move downward. The system gets input from an accelerator sensor which indicates the speed of acceleration. What you need to know is after any repair to the steering or suspension that needs an alignment to complete the repair, will need these sensors to be reset by the repairer once all factory alignment setting have been made. This may require the alignment shop or person to connect a scan tool programmed to reset these sensors to the proper values for your vehicle system to perform properly. Some newer alignment equipment has this capability built into their alignment system. All computer system sensors must be set in accordance to manufacturers’ recommended procedures and values.
In summary if you need to have a wheel alignment done for any reason always make sure the shop has access to the proper repair and alignment information. Also make sure the shop has the proper equipment and software to reset any of the electronic sensors that make your vehicle operate safely and correctly. Enjoy the ride!

 Todays vehicles are the safest to date for operators, passengers, and pedestrians.