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No More Free Tire ­Rotations!

Tire rotation is a cornerstone of vehicle preventive maintenance and tire longevity. It is a well-proven fact that tire tread life can be greatly enhanced by regular and timely tire rotation. During rotation, each tire and wheel is ­removed from...

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ASE G1: How To Measure Cold Cranking Amps, Reserve Capacity

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ASE A5: Brake Fluid And Bleeding Sequence

The ASE A5 Test includes a portion on brake fluid, bleeding, flushing and leak testing. You must know how to: • Diagnose poor stopping, pulling, dragging, or incorrect pedal travel caused by problems in the brake fluid; determine needed repairs. •...

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When Timing Is Everything: A Look At The 2.5L, 2.0L Powerplants

Last month, we looked at the timing chain setup on the Audi 3.2L engine and saw how a lack of oil changes can adversely affect the tensioners and cause engine failure. We’ve also seen similar issues with the timing chain setups on the 2.5L 5-cylinder...

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Modern Charging Systems: Cover All The Bases During the Diagnostic Process

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Audi Fuel System: MIL On/Multiple Low Fuel Pressure DTCs

Due to fuel intrusion into the low-pressure ­system fuel pressure sensor (G410), a false signal may be sent to the controller, resulting in a reading that is out of tolerance. Model: 2007 Audi A4 Sedan V6-3.2L Scenario: The MIL is on and one or...

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Redline Detection Seeks Nominations for 2nd Annual Redline Rock Star Performance Award

Redline Detection is encouraging anyone who works with, or knows, a talented technician to nominate him or her for the second annual Redline Rock Star Performance Award. The award recognizes a technician for their commitment to family, community and...

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Automotive Lift Institute (ALI) Elects 2015 Board

Jerome Lentz of Challenger Lifts (Louisville, Ky.) has been elected chairman of the Automotive Lift Institute (ALI) Board of Directors for 2015. Voting took place at ALI’s annual membership meeting Nov. 3 in Las Vegas. Lentz’s 2015 term will be...

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Top 5 Tools: John Forro, AST, Automotive Service Technology in Hinckley, OH

John Forro AST, Automotive Service Technology Hinckley, OH ALLDATA Information System: I use this system daily for researching labor pricing, wiring schematics, circuit descriptions, torque specs, etc. One doesn’t need to memorize all the information...

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Must-Read TPMS Technical Service Bulletins

Here’s a rundown of the top technical service bulletins related to TPMS. These TSBs should be analyzed by every technician that services TPMS. Audi TSB Number: 4413382034445/1 Models: 2010-’14 A4/S4, A5/S5 and Q5 Summary: This TSB addresses TPMS...

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Ford Reflash: Setting Up Your PC

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Fuel Line Replacement: The Why and How

If you live in a state that doesn’t get snow, you can stop reading right now. If you live in the Snow Belt, you are about a month away from snow and ice. It’s not the adverse driving conditions that should scare you or your customers, it’s...

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Home Chassis Tech Tip: Acura MDX Suspension May Pop, Clunk or Thump

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A 2001 Acura MDX owner may complain of front-end noises. There are three distinct noises that may come from the front suspension:
1. A sharp metallic pop, usually heard when accelerating or braking;
2. A clunk, usually heard when driving through dips in the road; and
3. A thump, usually heard when driving over rough roads.

Each of the three noises has a different probable cause. Symptom 1 is caused by insufficient clamping force of the lower arm to the subframe. Symptom 2 is caused by the front damper spring coil contacting the end of the spring. Symptom 3 is caused by faulty front dampers.

Based on the diagnosis of the vehicle’s specific symptom, torque the lower arm mounting bolts, install spring silencer tube sections, or replace one or both front dampers as needed.
Symptom 1: From VIN 2HNYD1…1H500001 thru 2HNYD1…1H517450
Symptom 2: From VIN 2HNYD1…1H500001 thru 2HNYD1…1H530609
Symptom 3: From VIN 2HNYD1…1H500001 thru 2HNYD1…1H521466

PARTS INFORMATION   
• Procedure B: Spring Silencer Tube: PN 52442-S0X-A01   
• Procedure C: Left Front Damper Unit: PN 51606-S3V-A04
• Right Front Damper Unit: P/N 51605-S3V-A04

Repair/Diagnostic Procedure
Perform the appropriate diagnosis based on the customer’s complaint or the symptom you hear during the testdrive.
1. Sharp metallic pop: Drive the vehicle in a full-lock turn (right or left), at about 2 to 3 mph, and apply the brakes hard. Then accelerate again to about 2 to 3 mph. Repeat this several times. If you hear a sharp metallic pop, go to REPAIR PROCEDURE A.
2. Clunk: Drive the vehicle through a dip or over a speed bump. If you hear a clunk, go to REPAIR PROCEDURE B.
3. Thump: Drive the vehicle on a choppy or washboard road. If you hear a thump, go to REPAIR PROCEDURE C.

REPAIR PROCEDURE A
Without removing the bolts, loosen the lower arm rear mounting bolt on each side. Torque the bolts to 90 lb-ft (122 N.m). The torque value above applies only to lower arm mounting bolts that have not been removed. If the mounting bolts are removed, they must be replaced and torqued to manufacturer’s specifications. All replacement mounting bolts are wax-coated to ensure proper clamping force. Test drive the vehicle as described in step 1 of diagnostic procedure to confirm the repair.

REPAIR PROCEDURE B
1. Raise the vehicle on a lift.
2. Wipe off the top section of the front damper springs with a shop towel, then clean the same section with isopropyl alcohol.
3. Cut the spring silencer tube in half with a utility knife or scissors.
4. Carefully pull down on the spring just enough to insert the spring silencer tube section onto the coil below the end of the spring. Position the spring silencer tube about 1 inch (25 mm) past the end of the spring. Repeat this step to install the other section of silencer tube onto the other front spring.
5.  If necessary, carefully pry between the spring coils with a short-handled screwdriver to ease installation of the tube sections.
6. Test drive the vehicle as described in step 2 of diagnostic procedure to confirm the repair.

REPAIR PROCEDURE C
1. Inspect the two front dampers.
a. If a damper is leaking fluid, replace it.
b. If the dampers show no signs of leakage, replace only the damper that thumps.
2. Check the front wheel alignment.
3. Test drive the vehicle as described in step 3 of diagnostic procedure to confirm the repair.

Courtesy of ALLDATA

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Brake and Front End Staff

Brake and Front End Staff

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