Audible Spark Knock Complaints on 1998-'02 GM Engines - Engine Builder Magazine

Audible Spark Knock Complaints on 1998-’02 GM Engines

Models affected:

1998-2002 Chevrolet Camaro, Corvette

1998-2002 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. 

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 15 ft.lb. (20 Nm).

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).

8.
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.
figure 1figure 2Figure 3

You May Also Like

Shop Solutions January 2023

Next time you have set of large journal small block Chevy connecting rods to resize, consider honing the big ends of them for a +.002” outside diameter bearing that the LS engines with fracture cap rods use.

Engine and Machine Shop Tips and Tricks

DOUBLE BYPASS

For proper block cleaning, the oil bypass valves in Gen 5 and 6 big block Chevys need to be removed. We made a couple different sized “hook” tools for a slide hammer. This tool will easily pull the valves out of the block and sometimes without damaging them.

Shop Solutions December 2022

Everyone misses occasionally, and this helps avoid dents and damage.

Jesel Certified Performance Rebuilds

Engine components are serious investments for any racer and maintaining that investment could be the difference between winning a championship and losing it.

Going the Extra Mile with Cylinder Head Porting

It’s not just the port work alone that creates spectacular cylinder head performance. The most critical areas of a cylinder head are those which pass the most air at the highest speed and for the longest duration. Your bowl area, the valve job, the throat diameter, and combustion chamber are all crucial parts. 

Tight Tolerances and Building Power

As you ascend Mt. Everest, you reach an area called the death zone. Once you climb high enough, the margin of error becomes perilously thin. That death zone also applies to engines. As the horsepower per cubic inch and rpm increase, the margin of error decreases. 

Other Posts

CNC Update: Features and Automation

Precision is key when it comes to automotive parts; the complex designs of connecting rods, pistons and rings, blocks, cylinder heads, and other parts require super tight tolerances that are getting more and more difficult to be met by hand or with other machining processes outside of CNC.

All Things Media Blasting

Engine building is a segment of the automotive industry that has always been ahead of the curve in media blasting, and no matter the engine shop, cleaning equipment is a common bond.

Engine & Hub Dynos: Necessary Tools and Additional Revenue

Being able to see the horsepower and the direct correlation to what is lost in the driveline is invaluable – dynos offer a myriad of benefits for the modern engine shop.

November 2022 Shop Solutions

November tricks and tips for the shop!