Fulltext TSBs

Technical Service Bulletins

TSB
04-20-6
  • TICKING OR KNOCKING NOISE COMING FROM THE CATALYTIC CONVERTERS
Publication Date: October 1, 2004

FORD:
1997-1998 F-250 LD
1997-2003 F-150

ISSUE:

Some 1997-2003 F-150 vehicles equipped with any engine, and 1997-1998 F-250 LD vehicles equipped with the 5.4L engine, may exhibit a ticking or knocking noise coming from the catalytic converters. The noise may be described as sounding like a diesel engine. The condition will be present when the vehicle is in gear at idle only, and is more pronounced when the vehicle is stationary, such as sitting in a drive-through line. The noise is normal, and is created by engine pulses being amplified through the light-off converters.

ACTION:

DO NOT replace converters unless loose internal components are found. To reduce the noise, install a wrap kit on each of the light-off converters. Refer to the instruction sheet included in the kit.


PART NUMBERPART NAME
4L3Z-5E258-ACExhaust Shield Kit

WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage

OPERATIONDESCRIPTIONTIME
042006AInstall Wrap Kit On Both Light-Off Converters (Includes Time To Perform Road Test)0.7 Hr.

DEALER CODING

BASIC PART NO.CONDITION CODE
5E21242