Engine Controls, Engine - Engine Knock At Hot Idle
TSB 11-7-107/07/11
5.0L - LOWER END ENGINE KNOCK AT HOT IDLE -
BUILT ON OR BEFORE 2/14/2011
FORD:
2011 F-150
ISSUE
Some 2011 F-150 vehicles equipped with a 5.0L engine and air conditioning (A/C) compressor stretchy belt configuration built on or before 2/14/2011 may exhibit a light lower end engine knock most noticeable when engine temperature is warm and the vehicle is at idle.
ACTION
Refer to the Service Procedure to correct the condition.
SERVICE PROCEDURE
1. Remove the front end accessory drive (FEAD) and A/C compressor stretchy belt. Refer to Workshop Manual (WSM), Section 303-05 Removal and Installation Air Conditioning (A/C) compressor belt - 3.5L GTDI, 3.7L, 5.0L. Does the knocking noise remain?
a. Yes, the knocking noise remains after removing the A/C stretchy belt. Do not continue with this article. Refer to WSM Section 303-00 for further diagnosis
b. No, the noise is no longer present. Obtain the Drive Belt Kit proceed to Step 2.
2. Remove the FEAD belt tensioner and bolt from the engine front cover. Refer to WSM, Section 303-05 - Exploded view.
3. Remove and discard existing A/C compressor to condenser discharge line and install new A/C compressor to condenser discharge line supplied in the Drive Belt Kit. Refer to WSM Section 412-01.
4. Using a 8 X 1.25mm tap, clean the mounting locations noted on the engine front cover and use compressed shop air to clean any remaining debris. (Figure 1)
5. Install A/C compressor drive belt idler pulley and A/C compressor drive belt idler pulley bolt supplied in the drive belt kit onto the engine front cover top mounting location. Tighten to 25 N.m (18 lb-ft).
6. Install A/C drive compressor belt tensioner supplied in the drive belt kit onto the engine front cover lower mounting location. Tighten to 25 N.m 18 lb-ft).
7. Install new A/C compressor belt supplied in the drive belt kit. Refer to WSM, Section 303-05 R and A/C compressor belt - 3.5L GTDI, 3.7L, 5.0L referring to the 5.0L (4V) late build vehicles procedure for proper belt routing. (Figure 2)
8. Reinstall the FEAD belt tensioner and bolt onto the engine front cover. Tighten to 25 N.m (18 lb-ft). Refer to WSM, Section 303-05 FEAD - Exploded view 5.0L (4V) late build vehicles.
9. Reinstall the FEAD belt. Refer to WSM, Section 303-05 FEAD - Exploded view 5.0L (4V) late build vehicles.
10. Install Integrated Diagnostic System (IDS) and identify the vehicle. Answer the IDS screen prompts according to the current vehicle A/C belt configuration.
11. Reprogram the Powertrain Control Module (PCM) using IDS release 72.03 or later. This new calibration is not included in the VCM 2011.3 DVD. Calibration files may also be obtained at the website.
12. Perform misfire monitor neutral profile correction. Select IDS toolbox icon, Powertrain, Service Functions, then Misfire Monitor Neutral Profile Correction.
NOTE
PLEASE ADVISE THE CUSTOMER THAT THIS VEHICLE IS EQUIPPED WITH AN ADAPTIVE TRANSMISSION SHIFT STRATEGY WHICH ALLOWS THE VEHICLE'S COMPUTER TO LEARN THE TRANSMISSION'S UNIQUE PARAMETERS AND IMPROVE SHIFT QUALITY. WHEN THE ADAPTIVE STRATEGY IS RESET, THE COMPUTER WILL BEGIN A RE-LEARNING PROCESS. THIS RE-LEARNING PROCESS MAY RESULT IN FIRMER THAN NORMAL UPSHIFTS AND DOWNSHIFTS FOR SEVERAL DAYS.
Parts Block
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
110701A F-150 5.0L: Install Service 1.2 Hrs.
Kit, Includes Time To
Recover, Evacuate And
Charge A/C (Do Not Use
With Any Other Labor
Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
6006 42
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