AfterMarketNews AfterMarketNews Auto Care Pro AutoCareCareerHub Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service Speedville

Strange Requests At The Service Counter

Sometimes, I have to wonder if certain ­customers’ brains are firing on all cylinders. But as an automotive service professional, I have to maintain a certain level of self-control while answering their questions, even though what they’re...

Read more...

Are All Cars ‘Supercars’ Now?

I attended an open house at Smokey’s Dyno in Akron, Ohio, last month. The shop was filled with Lamborghinis, Jaguars and other high-end cars. It was a great chance to look under the hoods of some supercars. The shop even had a rare McLaren P1 sitting...

Read more...

Documenting Inspections: Are You Leaving Maintenance Dollars on the Table?

How do you translate scribbles on a ­repair order into sales? There is no magic trick involved — the key is to document the vehicle ­inspection process. The more you know about your customers’ vehicles, and the more you are able to document...

Read more...

Mazda: Performing Regular Undercar Maintenance

This month, we’ll take a look at brake and undercar service on the Mazda vehicle lineup, with the footnote that even though this type of work ­becomes routine when you have a preventive maintenance mindset, good work habits from beginning to end are...

Read more...

Import Automatic Transmission Diagnostics

Don’t be alarmed if you pull an automatic transmission trouble code when diagnosing a “check engine” warning light! Since the automatic transmission operation has a major effect on grams-per-mile exhaust emissions, you’re going to see the...

Read more...

Honda: Vehicle Won’t Move or Barely Moves

A customer brings in a vehicle that won’t move forward, ­­backward or both. Check first to see if it grinds or clicks. And does the speedometer read a lot higher than you’re actually going? Chances are the driveshaft is disengaged. This can...

Read more...

iATN Exceeds 2 Million Forum Messages

The number of messages in the professional automotive discussion forums of the International Automotive Technicians Network (iATN) exceeded 2 million in early December 2014, with the Shop Management and Technical Discussion forums being the most popular...

Read more...

Diagnosing Starter Misses

Contributing writer Gary Goms was called to a friend’s shop to help with a no-cranking condition on a 2006 Chevy Tahoe. After diagnosing a faulty PCM ground, locating the missing ground proved to be problematic. Find out how Gary solves The Case...

Read more...

Snap-on Adds Diagnostic Calculator To Website

Snap-on announces a new diagnostic calculator feature has been added to its website at http://diagnostics.snapon.com to help automotive repair technicians and shop owners determine how much profit they could be making by using a Snap-on diagnostic platform,...

Read more...

Head Gasket Do’s and Don’ts

DO: Clean the holes. To ensure accurate torque values and to avoid cracking the cylinder block, clean any dust, dirt, oil and fluid from the cylinder block head bolt holes before installing the new head gasket and head bolts. Never lubricate the...

Read more...

Harmonic Dampeners: Why They Fail, What to Look For

Every time a cylinder fires, the crankshaft speeds up a very small amount for a short period of time. It is then slowed down as the next cylinder in the firing order compresses air and fuel for the next combustion event. The speeding up and slowing...

Read more...

Be Careful When Replacing That Diesel Air Filter

Modern passenger and light-duty diesels with ECMs have mass airflow sensors and precisely control fuel ­delivery. Key to the efficiency and lifespan of the diesel engine is the diesel air filter. A restricted air filter will not affect fuel economy but...

Read more...

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

Print Print Email Email

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

The following two tabs change content below.
Brake and Front End Staff

Brake and Front End Staff

Latest articles from our other sites:

Head Gasket Do’s and Don’ts

DO: Clean the holes. To ensure accurate torque values and to avoid cracking the cylinder block, clean any dust, dirt, oil and fluid from the cylinder block head bolt holes before installing the...More

CARDONE Innovation Team Announces New Products

CARDONE Industries has introduced several new products to its portfolio of automotive replacement parts. Electronic braking units have been added to the company’s remanufactured brakes offering. According...More

Mazda: Performing Regular Undercar Maintenance

This month, we’ll take a look at brake and undercar service on the Mazda vehicle lineup, with the footnote that even though this type of work ­becomes routine when you have a preventive maintenance...More

Import Automatic Transmission Diagnostics

Don’t be alarmed if you pull an automatic transmission trouble code when diagnosing a “check engine” warning light! Since the automatic transmission operation has a major effect on grams-per-mile...More

iATN Exceeds 2 Million Forum Messages

The number of messages in the professional automotive discussion forums of the International Automotive Technicians Network (iATN) exceeded 2 million in early December 2014, with the Shop Management and...More

Loosen Seized Fasteners with Lisle’s Small Fastener Remover

Use Lisle’s Small Fastener Remover (60530) with a pneumatic impact tool to loosen rusted or seized fasteners. A 3/4" open end wrench can be used to turn the socket while impacting the fastener. A...More

Head Gasket Do’s and Don’ts

DO: Clean the holes. To ensure accurate torque values and to avoid cracking the cylinder block, clean any dust, dirt, oil and fluid from the cylinder block head bolt holes before installing the...More

Harmonic Dampeners: Why They Fail, What to Look For

Every time a cylinder fires, the crankshaft speeds up a very small amount for a short period of time. It is then slowed down as the next cylinder in the firing order compresses air and fuel for the next...More