Tech Tip: Boom-Type Noise During Engine Warm-Up on Chevy Astro Vans

Tech Tip: Boom-Type Noise During Engine Warm-Up on Chevy Astro Vans

Some customers may comment on a boom-type noise heard in the vehicle passenger compartment during engine warm-up. To correct this, install an exhaust dampener assembly on affected vehicles. Use the following procedure and the part numbers listed in this Tech Tip.

Vehicles:
• 1996-2005 Chevrolet Astro Van
• 1996-2005 GMC Safari Van

Condition:
Some customers may comment on a boom-type noise heard in the vehicle passenger compartment during engine warm-up.

Correction:
Install an exhaust dampener assembly on affected vehicles. Use the following procedure and the part numbers listed below.

1. Raise and support the vehicle. Refer to the General Information subsection of the applicable service manual for information on lifting and jacking the vehicle.

Important: The exhaust dampener weight must face forward.

2. Position the exhaust dampener assembly on the catalytic converter pipe assembly approximately 90 mm (4 inches) forward of the outlet flange. See Figure 1.

3. Hand tighten the clamp nut and the dampener weight while maintaining the proper position. Install three 3/8” inside diameter and 1/16” thickness flat washers, part number 11509161, or equivalent between the top of the dampener and the heat shield plate.

Note: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the 3/8-inch inside diameter lock washer, part number 11500046, or equivalent and jam nut. Tighten the clamp nut and the jam nut to 30 Nm (22 lb.ft.).

5. Lower the vehicle.

Technical service bulletin courtesy of Mitchell 1.

For additional information, visit www.mitchell1.com.

You May Also Like

Gravity Releases Universal EV Charging ‘Trees’

The ‘trees’ require no utility upgrades and are capable of providing 200 miles of range in either 13 minutes (200kW) or 5 minutes (500kW).

Gravity has released a new universal on-street mounting and cable system, dubbed “DEAP Trees,” for its 200kW and 500kW Distributed Energy Access Points (DEAPs). Gravity said it is striving to develop a network of on-street DEAP charging more expansive than Tesla’s current Supercharger network.

Gravity’s engineers, in collaboration with design firm Rangr Studio, took on the challenge of solving frictions in curbside charging today. Each Gravity universal DEAP Tree has a hinged swing arm holding a cable that pivots down when charging begins, allowing it to reach the port of every make and model. When charging is completed, the arm raises automatically and the EV connector latches back onto the pole and out of sight.

Randy Breaux, Group President, GPC North America, Talks to AMN Drivetime

At NAPA, “Breaux Knows” business relationships, ABCs to avoid, and serving the automotive professional.

Asahi Kasei Achieves Electrolyte Technological Breakthrough

The company said it successfully achieved proof of concept for lithium-ion batteries with improved power output and service life.

TEXA Announces CAR 76.6.0 Software Release

The software provides free streamlined access without login or authentication required to the Motor TruSpeed platform.

We Want To Know: Where Do You Buy Your Parts?

Your honest and anonymous responses today will help us provide better information to you in the future.

Other Posts

Autel’s CSMS Achieves OCPP 2.0.1 Certification

The Charging Station Management System obtained the certification from the Open Charge Alliance.

Tool Time Podcast: Lumileds

Nadine and Eric sit down with Lumileds’ Aubry Baugh to discuss all the professional lighting solutions the company has to offer.

Cummins, Daimler Truck and PACCAR Form Joint Venture

The completed joint venture is now known as Amplify Cell Technologies.

Bosch Announces 87 Aftermarket Parts Released in June

The new part numbers include 22 wiper part numbers, 35 rotating machines, 20 sensors, six spark plugs and more.