Infiniti FX35 Suspension Issues Explained(+3 Tips)

In this brief article we are going to discuss the different Infiniti FX35 Suspension problems, what the causes are, and Troubleshooting Tips.

Top 6 most common suspension issues in the Infiniti FX35? 

The most common suspension issues seen in the Infiniti FX35 are:

  • Front Strut Top Mount Bearing Failure
  • Front Lower Control Arm Bushing Failure
  • Anti Roll Bar Drop Link Failure
  • Anti Roll Bar D-Bush Wear
  • Rear Shock Absorber Failure
  • Front Shock Absorber Failure
  • Front Subframe mounting bush failure

What suspension does the Infiniti FX35 have?

The FX was the replacement for the QX4 in Infiniti’s crossover SUV segment. It was built on the FM platform shared with the RWD Nissan 370Z.  The FX First generation (S50 in 2003) used the model names FX35 and FX45, which were part of the S50 Model line and refer to the two available engines. The FX became the Q70  in 2013 and eventually ceased production in 2017. It will be relaunched in 2022.

Front Suspension

The Front suspension in the Infiniti FX35 is a MacPherson Strut and Lower control Arm with Anti-roll bar. This arrangement is mounted onto the front subframe.

Rear Suspension

The Infiniti FX35 has a 4-link rear suspension set-up with a Trailing Arm, Upper and Lower control arms, Toe Control Arm, Coil Spring, Shock Absorber and Anti Roll Bar

Front Strut Top Mount Bearing Failure

Symptoms:

  • Knocking Noise while going over Rough Road Patches
  • Bumping/Knocking Noises when trying the lock steering in parking

Troubleshooting Front Strut Top Mount Bearing Failure

  • The Top Strut Mount contains a bearing that allows the strut to rotate while steering
  • When the Top Strut mount is damaged, the bearing also fails and restricts the strut from rotation during steering. This is what causes the knock and creak noises.

Front Lower Control Arm Failure

Symptoms:

  • The car seems to be drifting
  • Steering seems vague while Lane Changing
  • Uneven Tire Wear pattern
  • Knocking Noises while going over Rough Patches

Root Cause:

  • Due to a Tire wear issue, it can be inferred that the alignment of the front suspension is outside of the recommended settings. But this is still a symptom.
  • The cause for alignment change points to the Lower control arm Bushings and Ball-joints that may have got worn or damaged

Troubleshooting Front Lower Control Arm Bushing Failure: Lower Control Arm Bushing

  • Lower Control Arm bushing wears out over time and cracks due to age
  • When inspecting the Lower control arm after removal, it is clear that there are tears and cracks in the rubber portion

Troubleshooting Front Lower Control Arm Bushing Failure: Lower Control Arm Ball-Joint

  • The lower control arm ball-joints are also subject to wear and tear.
  • The deterioration is usually initiated as a crack or rupture in the rubber boot around the ball-joint
  • This leads to loss of lubrication and finally to complete wear out
  • The wear out causes play or movement accompanied by knocking noise. The play in the ball-joint is one of the reasons for the vehicle steering feeling value
  • The best course of action would be to replace the whole Lower control arm since it comes with 2 new bushings and 1 new ball-joint all pre-assembled

Anti Roll Bar Drop Link Failure

Symptoms:

  • Clunking Noise while normal driving
  • Noise gets worse when going over a rough patch

Troubleshooting Anti Roll Bar Drop Link Failure

  • Clunking noises, in most passenger cars, almost always point to the Anti-roll bar linkages
  • The noise is due to the play in the joints of the Anti Roll Bar Drop links.
  • The FX35 has Anti-roll bar Drop links both in the front as well as rear suspension. The rear drop link is shorter than the front
  • One good way to diagnose this problem is to hold the Anti-roll Bar and Push and Pull it hard.
  • If you see the ball-joint separating and moving along with a knocking noise, then you have found the root cause for Clunking Noise
  • Once you remove the Drop Link, you can check the ball-joints by hand the see if they move with play

Anti Roll Bar D-Bush Failure / Dryness

Symptoms:

  • Squeak Noises while driving
  • Noise is more apparent when going over a rough patch

Troubleshooting Anti Roll Bar D-Bush Failure

  • Squeaks and Creaks generally relate to metallic Spring elements within the suspension, namely, the Coil Spring and the Anti-Roll Bar
  • If the noise is more apparent on a rough road one could be more suspicious of the Anti Roll Bar
  • In order to confirm this, you can try rotating the Anti-roll Bar by hand after removing the Drop-link ball joint.
  • If you hear the Creaking Noise, then it’s confirmed that the Anti-roll bar was indeed the issue.
  • When you rotate the Anti Roll Bar, it does so on the support of a D-Bush Rubber (or Polymer) Bearing that connects the the Anti-roll bar to the Chassis frame
  • The Anti roll bar metal rod rotates within this bush and rubs itself on the inner surface of the bushing. This causes considerable friction or wear.
  • If this D-Bush is of harder Polymer-based material then it requires lubrication. There are Anti-roll bar mounting grease products available in the market which you could use.
  • Or refer to the manufacturer’s Service Instructions to see if there is a particular product recommended

Rear Shock Absorber Failure

Symptoms:

  • Knocking and Popping Noises from the Rear going over bumps
  • Rear end feels bouncier

Troubleshooting Rear Shock Failure

  • The Bouncy Ride symptom points to the Shock Absorber as a probable cause.
  • The noises coming from the rear are partly due to the failed shock absorber allowing the bump stops to contact more often. And also the noises partly come from the worn out shock mounting bushes that allow the shock to move and hit against the mounting brackets.
  • If your vehicle has crossed 50K miles, then it could be due for a shock replacement. Due to long-term internal wear, the shock starts becoming ineffective over time.
  • If the rear shock has started leaking oil due to a failed oil-seal, then it means that the shock will no longer be effective.
  • One good way to tell if your shock has failed or not is to do a “Bounce Test”. Put all your weight on one of the front corners of the vehicle pushing it downwards. Keep oscillating the corner till you feel that it has reached its maximum height. Once you take your hands off the corner, observe how it settles. If it takes more than 2 oscillations to settle, that means the damper has failed.

Pro Tip

  • When tightening the Shock bottom bolt, make sure that the vehicle is at its normal ride height.
  • If this bush is tightened at any other ride height, the cush always sits in a twisted condition at normal ride height and will result in a reduced service life.

Front Shock Absorber Failure

Symptoms:

  • Rattling Noise going over any rough patches
  • Front end bouncier than normal
  • Changes in handling behaviour; Vehicle not feeling stable at high speed cornering

Troubleshooting Front Shock Absorber Failure

  • The Bouncy Ride symptom points to the Shock Absorber as a probable cause.
  • If your vehicle has crossed 50K miles, then it could be due for a shock replacement. Due to long-term internal wear, the shock starts becoming ineffective over time.
  • If the front strut shock has started leaking oil due to a failed oil-seal, then it means that the shock will no longer be effective.
  • One good way to tell if your shock has failed or not is to do a “Bounce Test”. Put all your weight on one of the front corners of the vehicle pushing it downwards. Keep oscillating the corner till you feel that it has reached its maximum height. Once you take your hands off the corner, observe how it settles. If it takes more than 2 oscillations to settle, that means the damper has failed.

Rear Wheel Bearing Failure

Symptoms:

  • Droning noise above 30 mph speeds
  • Sound is louder with increasing speed

Troubleshooting Rear Wheel Bearing Failure

  • Droning noise is generally associated with one of the wheel bearings depending on where the noise is coming from
  • Wheel bearings generally have a life of 70K miles, after which, on detecting noise issues, must be replaced
  • In the FX35, the wheel bearing is housed within the Knuckle and the Wheel Spindle. It is of a single-piece design.
  • The Wheel Hub comes as a unit along with the Wheel bearing press-fitted

Pro-Tips:

  • In order to remove the rear wheel hub, you will need a 3-Arm Gear Puller

Conclusion

In this brief article we have discussed the different Infiniti FX35 Suspension problems, what the causes are, and Troubleshooting Tips.

For any questions or comments, please feel free to get in touch with us.

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