Tech Tip: Audible Spark Knock, MIL On and DTC P0332 Set on GM Models

Tech Tip: Audible Spark Knock, MIL On and DTC P0332 Set on GM Models

Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration, and/or an illuminated MIL.

Models affected:
1998-2002 Chevrolet Camaro, Corvette

figure 11998-2002 Pontiac Firebird with 5.7L Engine (VIN G – RPO LS1)

1999-2002 Chevrolet Silverado, Suburban, Tahoe

2002 Chevrolet Avalanche

1999-2002 GMC Sierra, Yukon, Yukon XL

2002 Cadillac Escalade, Escalade EXT with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U – RPOS LR4, LM7, L59, L09, L04)

Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration, and/or an illuminated MIL. Upon investigation, the technician may find DTC P0332 set.

This condition may be the result of corrosion of the rear bank knock sensor due to water intrusion into the sensor cavity.

This condition is more apparent on vehicles in which customers frequently wash the engine compartment.

Replace the rear bank knock sensor (P/N 10456603) and build a dam (wall) around the sensor using RTV to divert water away from the sensor. Use the procedure and part number listed.

1. Remove the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate service manual. figure 2

2. Remove the wiring harness assembly from the knock sensor.

See Figure 1.

3. Remove the rear bank knock sensor.

See Figure 2.

4. Install the new rear bank knock sensor. Tighten the knock sensor to 20 Nm (15 lb.-ft.).

5. Install the wiring harness assembly to the knock sensor.

6. Apply a bead of RTV silicone sealant approximately 9 mm (3/8”) wide and 6 mm (1/4”) high along the outside edge of the ridge on the engine block valley cover around the rear bank knock sensor. DO NOT form a complete circle. Leave the rear section open as shown in Figure 3.

7. From the underside of the intake manifold, completely remove the rear intake manifold seal (foam material).

Figure 38. Install the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate service manual.

 

Technical service bulletin courtesy of Mitchell 1.

For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.

 

You May Also Like

FCS Introduces 42 New Numbers in May

Complete strut assemblies, shock absorbers, shock absorber assembly kits and suspension struts for popular VIO applications are included.

FCS Automotive announced the release of 42 new numbers in May, including:

8 Complete Strut Assemblies (936,389 vehicles in operation)

6 Shock Absorber Assembly Kits (2,696,801vehicles in operation)

16 Shock Absorbers (6,245,071 vehicles in operation)

12 Suspension Struts (2,135,974 vehicles in operation)

Philips Ultinon Drive 5000 LED Lightbar Line Expands

Lumileds has expanded the Philips Ultinon Drive 5000 series to include eight models.

DMA Adds New BrakeMaster Coverage

New coverage for Ford and Chevy includes popular pickup trucks and SUVs.

Akebono Expands Severe Duty Disc Brake Pad Kits

Akebono said it expanded its severe-duty ultra-premium disc brake pad line by 14 new part numbers.

GSP Releases New CV Axle Part Numbers

GSP said 14 new CV axle part numbers are in stock and ready to ship.

Other Posts

Chassis Parts and Alignment Angles

Knowing why the adjustment is required is critical to performing the total alignment.

Steering Angle Sensor Service

Ninety percent of the time when a steering angle sensor code is active, it means the sensor needs to be calibrated.

Driveshaft, Axle and Drivetrain Noise FAQs

Follow along to learn more about these unwanted noises.

Replacing Master Cylinders

The most common problems that occur in the master cylinder are wear in the piston bore and piston seal failure.