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#224 - 05/24/02 08:30 PM New TSB for Knock problems  
Joined: Dec 2000
Posts: 5,017
teamzr1 Offline
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teamzr1  Offline
Owner - Pays the bills
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Joined: Dec 2000
Posts: 5,017
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Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor) #02-06-04-023
Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor)
1998-2002 Chevrolet Camaro, Corvette
1998-2002 Pontiac Firebird

with 5.7L Engine (VIN G -- RPO LS1)

1999-2002 Chevrolet and GMC C/K Pickup and Utility Models (Avalanche, Silverado, Sierra, Tahoe, Suburban, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL)

with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U -- RPOs LR4, LM7, L59, LQ9, LQ4)

Condition
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.

Cause
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.

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

Remove the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate Service Manual.

Remove the wiring harness assembly from the knock sensor.

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

Install the wiring harness assembly to the knock sensor.

Apply a bead of RTV silicone sealant approximately 9 mm (3/8 in) wide and 6 mm (1/4 in) 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.
From the underside of the intake manifold, completely remove the rear intake manifold seal (foam material).
Install the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate Service Manual.
Parts Information
Part Number
Description
Qty

10456603
Sensor, Knock
1


Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

J4437

(F-Car)
Sensor, Knock -- Replace
1.7 hrs

Add

(1998-1999 F-Car Only)
To Remove EGR
0.2 hr

J4437

(Y-Car)
Sensor, Knock -- Replace
1.6 hrs

J4437

(C/K-Truck)
Sensor, Knock -- Replace
1.5 hrs

Add

(C/K Truck Only)
With Three Piece Engine Covers
0.2 hr

Add

(All)
Diagnosis Time
0.3 hr

Add

(All)
To RTV Area Around Sensor and Remove Intake Manifold Seal
0.2 hr


Team ZR-1
True Custom Performance Tuning
Teamzr1.com
#225 - 10/02/03 07:00 PM Re: New TSB for Knock problems  

**DONOTDELETE**
Unregistered
Anonymous
Unregistered


How does a bad sensor cause audible spark knock?


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