Tech Tip: Acura Front Suspension Knock

Tech Tip: Acura Front Suspension Knock

A knocking noise from the front of any vehicle can be a cause for concern. If the vehicle is an old pickup truck with 150,000 miles of hard off-road use, noises usually come with the territory and are sometimes acceptable. But, if the vehicle is a 1996-98 Acura RL, not only will the owner notice it, they will probably want it fixed right away.

A knocking noise from the front of any vehicle can be a cause for concern. If the vehicle is an old pickup truck with 150,000 miles of hard off-road use, noises usually come with the territory and are sometimes acceptable. But, if the vehicle is a 1996-98 Acura RL, not only will the owner notice it, they will probably want it fixed right away.

When an Acura RL owner visits your shop complaining about a knocking noise from the front suspension when driving over bumps, the noise may be caused by worn upper arm bearings. The following tech tip may help you quickly diagnose and repair the problem.

DIAGNOSIS
1. Test-drive the vehicle over a bumpy road to verify the noise and to determine its location.
2. Raise the vehicle on a lift.
3. On the vehicle side where the noise is heard, hit the tire with a large soft-faced mallet while placing your hand over one of the upper arm bearings. Repeat this action with your hand placed over the other bearing.

• If you feel looseness or hear knocking from either bearing, go to the Repair Procedure.
• If no knocking noise is heard and no looseness is felt, look for other possible causes.
• If you heard the noise from both sides of the vehicle, repeat Step 3 on the other side.

SERVICE PROCEDURE
NOTE: This procedure does not require wheel alignment after completion.

1. Remove the wheel.
2. Remove the ABS wheel sensor wire harness from the upper arm.
3. Remove and discard the two upper arm 12 mm self-locking nuts.
NOTE: The upper arm bearings are built into the front anchor bolts.
4. Lower the upper arm, and pull it toward you to access the two front anchor bolts containing the upper arm bearings.
5. Remove and discard the front anchor bolt 10 mm self-locking nuts and the flange bolts, then remove and discard the front anchor bolts.
6. Install new front anchor bolts, making sure the large seal on the bolt faces outward. Secure the anchor bolts with new flange bolts and 10 mm self-locking nuts. Torque the nuts to 22 lb-ft (30 N-m).
7. Reinstall the upper arm, and secure it with new 12 mm self-locking nuts. Torque the nuts to 47 lb-ft (64 N-m).
8. Reinstall the ABS wheel sensor wire harness.
9. Reinstall the wheel. Torque the wheel nuts to 80 lb-ft (108 N-m).
10. Test-drive the vehicle to make sure the noise has been eliminated.

Accura and RL are registered trademark names and model designations of the American Honda Motor Company. All trademark names and model designations are being used solely for reference and application purposes.

Written by ALLDATA Technical Editor, Rich Diegle. Rich is an Advanced Engine Performance Certified and ASE Master Technician with an Associate of Arts degree in automotive technology and 22 years of dealership and independent shop experience.

For additional information, visit www.alldata.com.

You May Also Like

CITGO Enters EV Space with Pilot Program Launch

The CITGO location on 11 Mile Road in Michigan now offers both regular transportation fuel and EV charging stations.

CITGO Petroleum Corporation, along with marketer Folk Oil Company, recently launched an electric vehicle (EV) charging pilot program they said is designed to meet the needs of EV drivers in Battle Creek, Mich. The CITGO location at 15551 11 Mile Road now offers both regular transportation fuel and EV charging stations. For added consumer convenience, EV chargers include both Charging System (CCS) and the North American Charging Standard (NACS) plugs, the companies said.

TS Toolbox Guide February 2024

Here’s a look at some of the core feature and modern frills to consider when it’s time to move into a new office.

toolbox guide illustartion
Stellantis Increasing Production of Electric Drive Modules

The company will add EDM production in Szentgotthard, Hungary, targeted to begin in late 2026.

Embracing Cutting-Edge Solutions the Industry has to Offer

Embracing cutting-edge solutions is strategic and imperative for technicians navigating the constantly changing landscape of automotive maintenance and repair.

Nadine Battah
Tool Time Podcast: Clore Automotive

Jim O’Hara from Clore Automotive joins Nadine Battah and Eric Garbe.

Other Posts

TechShop, ShopOwner Offer $50 For Good Guesses

Guess the Tool for a chance at cold hard cash!

GM, Honda Begin Volume Production of Fuel Cell Systems

GM and Honda will produce fuel cells that will be two-thirds less expensive compared to Honda’s 2019 Clarity fuel cell.

Toyota Bringing Battery EV Production to Kentucky

It will invest $1.3 billion at its flagship Kentucky facility for future electrification efforts, including assembly of an all-new, three-row battery electric SUV for the U.S. market.

Repairify Announces Executive Leadership Changes

The company has named Craig Edmonds as president of asTech among other executive appointments.