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The Problem With Living in the ‘Now’

I once had a shop manager who concentrated on the “now.” Every day was a mad dash to complete the jobs at hand. He wanted to know who was working on what, where the parts were and when everything would be done. He was constantly reacting to a customer’s...

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ASE G1: Drive Belt Inspection, Replacement

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Amateurs and Hacks Provide Job Security For Automotive Service Professionals

Two cars pull up in front of my shop. The drivers didn’t come in, but I heard the commotion from my office window. The boyfriend opens the hood of his girlfriend’s car. They both stare at the engine; she tells the boyfriend that she was supposed...

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Intermittent Engine Misfire Analysis

Even for an experienced diagnostic technician, ­attempting to diagnose an intermittent misfire ­condition that occurs only under specific driving conditions can be a frustrating exercise. Let’s begin by getting the basics out of the way. As we know,...

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Honda: Easy Fix for Engine Noise

We often encounter engines that have a cold-start knock or ticking noise. In this case, the 3.5-L V6 engines installed in various Honda models can make a knocking or ticking noise at idle and only when warm. The cause of the problem is that the rocker...

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Analyzing the Cylinder Pressure Waveform from a Running Engine, Part 3

By Vasyl Postolovskyi and Olle Gladso Contributing Writers and Instructors at Riverland Technical and Community College in Albert Lea, MN   In Part 1 of this Maximizing Tools series, we discussed an alternative approach to diagnosing an engine...

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Mac Tools Is Wrenching for a Cure

In support of Breast Cancer Awareness month, Mac Tools is featuring a variety of Wrenching For A Cure products available for purchase in the Flyer 11 through Nov. 2. Featured pink products include clothing, accessories, flashlights, pint glasses, and...

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5 Tool Storage Tips

  As a technician, you likely own thousands of dollars worth of tools and equipment, and require tool storage capacity to hold them all, along with carts and accessories to help move those tools around your work area. Here are a few items...

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Toughest Spark Plug Changes

We have all been there before: scratched arms, busted knuckles and an aching back caused by a difficult spark plug replacement job. If you think they are getting tougher every year, you are right. Every new engine design is putting the plugs deeper...

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Improving the Head Gaskets, Fasteners Relationship

The relationship between head gaskets and head bolts is an intimate one. The clamping load applied by the head bolts is what allows the head gasket to maintain its seal. For this marriage to last, there has to be constant tension – not too much,...

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Top Ten Fuel Pump Fails

10. Strainer Blocks Fuel-Level Sender A fuel pump inlet strainer may be installed that is interfering with the travel of the fuel-level sensor’s float arm, which causes an optimistic fuel level reading. Dented fuel tanks may also cause a false reading...

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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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