[soswald1975]

I have been having the following issues, and will post what I received directly from an Infiniti dealership. They wanted a ton to fix, so will also post what my mechanic has done and still have the same issues.

Issues :
1. SUV bounces like crazy while driving going over bumps or changes in the road
2. Rear end sways back and forth when hitting a small crack in the street, pothole, manhole cover etc.
3. Brake pedal is really soft. Doesn't go to the floor, but need to depress probably half way before catching. Also, every time you brake it triggers the seat belt tightening sensor
4. Front end and steering wheel shakes only at 65-70 mph. Going faster or slower, no shakes.

Infiniti dealership Estimate and Report :
Hydraulic Fluid Leak Right Tire

Issue
FRONT HYDRAULIC LINES LEAKING, ALL CORRODED. REAR ACCUMULATOR PUMP LEAKING. CAUSING SUSPENSION TO BE LOOSE. EXCESSIVE CORROSION CAUSING LEAK

Recommendation
HYDRAULIC LINES TO FRONT STRUTS AND LINES THAT RUN ON LEFT SIDE TO REAR. REAR HYDRAULIC ACCUMULATOR LR OF CAR,. BLEED SYSTEM

Estimate
$ 11,113.68 My mechanic replaced all the hydraulic lines, and accumulators. Bled system. No change in loose suspension or swaying


Truck Is Very Bouncy - Rear End Feels Unstable

Issue
REAR SUSPENSION SAG. COMPRESSOR ENGAGES. SPRAYED LINES NO AIR LEAK. FOUND DTC FOR REAR HEIGHT SENSOR

Recommendation
REAR HEIGHT SENSOR.L.

Estimate
$ 835.16 My mechanic replaced the Rear Height Sensor. No change in the truck bouncing


Front Shocks / Suspension

OUTER TIERODS HAVE PLAY

Recommendation
L&R OUTER TIEROD ENDS AND FRONT TOE ADJUSTMENT

Estimate
$ 1,346.46 My mechanic replace both L & R Inner and Outer Tie Rods. Front end and steering wheel still shakes

Total estimate
$ 15,160.05 ( This included oil change, transmission service, cabin filters, plugs and a few other maintenance things as well as above repairs)

So now we are still at a loss. My mechanic has taken it into a Nissan dealership, and they have said that all the sensors and entire truck basically just needs to be programmed correctly. Hooked up to their computer system so they can program the entire truck. They programmed it twice already, and still can't fix any of the issues. Does this make sense? Could the sensors just not be reading each other, therefore not performing correctly? Does anyone know if it is a simple programming job or does it take multiple tries?

We have checked brakes, rotors etc. Have put on 2 new rear tires.

Any other suggestions or what I should do next would be helpful.

 

[toname]

I have been having the following issues, and will post what I received directly from an Infiniti dealership. They wanted a ton to fix, so will also post what my mechanic has done and still have the same issues.

Issues :
1. SUV bounces like crazy while driving going over bumps or changes in the road
2. Rear end sways back and forth when hitting a small crack in the street, pothole, manhole cover etc.
3. Brake pedal is really soft. Doesn't go to the floor, but need to depress probably half way before catching. Also, every time you brake it triggers the seat belt tightening sensor
4. Front end and steering wheel shakes only at 65-70 mph. Going faster or slower, no shakes.

Infiniti dealership Estimate and Report :
Hydraulic Fluid Leak Right Tire

Issue
FRONT HYDRAULIC LINES LEAKING, ALL CORRODED. REAR ACCUMULATOR PUMP LEAKING. CAUSING SUSPENSION TO BE LOOSE. EXCESSIVE CORROSION CAUSING LEAK

Recommendation
HYDRAULIC LINES TO FRONT STRUTS AND LINES THAT RUN ON LEFT SIDE TO REAR. REAR HYDRAULIC ACCUMULATOR LR OF CAR,. BLEED SYSTEM

Estimate
$ 11,113.68 My mechanic replaced all the hydraulic lines, and accumulators. Bled system. No change in loose suspension or swaying


Truck Is Very Bouncy - Rear End Feels Unstable

Issue
REAR SUSPENSION SAG. COMPRESSOR ENGAGES. SPRAYED LINES NO AIR LEAK. FOUND DTC FOR REAR HEIGHT SENSOR

Recommendation
REAR HEIGHT SENSOR.L.

Estimate
$ 835.16 My mechanic replaced the Rear Height Sensor. No change in the truck bouncing


Front Shocks / Suspension

OUTER TIERODS HAVE PLAY

Recommendation
L&R OUTER TIEROD ENDS AND FRONT TOE ADJUSTMENT

Estimate
$ 1,346.46 My mechanic replace both L & R Inner and Outer Tie Rods. Front end and steering wheel still shakes

Total estimate
$ 15,160.05 ( This included oil change, transmission service, cabin filters, plugs and a few other maintenance things as well as above repairs)

So now we are still at a loss. My mechanic has taken it into a Nissan dealership, and they have said that all the sensors and entire truck basically just needs to be programmed correctly. Hooked up to their computer system so they can program the entire truck. They programmed it twice already, and still can't fix any of the issues. Does this make sense? Could the sensors just not be reading each other, therefore not performing correctly? Does anyone know if it is a simple programming job or does it take multiple tries?

We have checked brakes, rotors etc. Have put on 2 new rear tires.

Any other suggestions or what I should do next would be helpful.

Ouch... At that price you can buy a certified used one with less problems. Did you buy this one Used? or are you the first owner? When did all these symptoms start happening? Let's start with the front end first... if the tires and steering wheel shakes only at certain speeds. Maybe you need to have your front tires balanced... what is the condition of the front tires currently?. Can you take pictures of the treads on the front tires(a frontal view and top view if your can). Tire tread wear can tell a lot about what your front end is doing. I don't doubt that your front end parts need replacement, but can't tell without inspection.

A bouncy rear end usually means... ( have you ever seen a vehicle in front of you while driving. That when they hit a bump their rear end bounces like a ball?) bad shocks... among other things. That might be happening to yours I'm also concerned about the condition of your under carriage. If they are pretty rusted out. Your rear suspension components may have all freezed up due to rust and are not function properly. Rear Air Suspensions (I have one) can be really bouncy and uncontrollable when hitting bumps (most especially if not towing). I'm changing my out with non-air after market components. Shocks and springs.

Sorry... but pictures here will really be helpful to help point out issues and better help from the forum. I hope this help a bit.

I have been having the following issues, and will post what I received directly from an Infiniti dealership. They wanted a ton to fix, so will also post what my mechanic has done and still have the same issues.

Issues :
1. SUV bounces like crazy while driving going over bumps or changes in the road
2. Rear end sways back and forth when hitting a small crack in the street, pothole, manhole cover etc.
3. Brake pedal is really soft. Doesn't go to the floor, but need to depress probably half way before catching. Also, every time you brake it triggers the seat belt tightening sensor
4. Front end and steering wheel shakes only at 65-70 mph. Going faster or slower, no shakes.

Infiniti dealership Estimate and Report :
Hydraulic Fluid Leak Right Tire

Issue
FRONT HYDRAULIC LINES LEAKING, ALL CORRODED. REAR ACCUMULATOR PUMP LEAKING. CAUSING SUSPENSION TO BE LOOSE. EXCESSIVE CORROSION CAUSING LEAK

Recommendation
HYDRAULIC LINES TO FRONT STRUTS AND LINES THAT RUN ON LEFT SIDE TO REAR. REAR HYDRAULIC ACCUMULATOR LR OF CAR,. BLEED SYSTEM

Estimate
$ 11,113.68 My mechanic replaced all the hydraulic lines, and accumulators. Bled system. No change in loose suspension or swaying


Truck Is Very Bouncy - Rear End Feels Unstable

Issue
REAR SUSPENSION SAG. COMPRESSOR ENGAGES. SPRAYED LINES NO AIR LEAK. FOUND DTC FOR REAR HEIGHT SENSOR

Recommendation
REAR HEIGHT SENSOR.L.

Estimate
$ 835.16 My mechanic replaced the Rear Height Sensor. No change in the truck bouncing


Front Shocks / Suspension

OUTER TIERODS HAVE PLAY

Recommendation
L&R OUTER TIEROD ENDS AND FRONT TOE ADJUSTMENT

Estimate
$ 1,346.46 My mechanic replace both L & R Inner and Outer Tie Rods. Front end and steering wheel still shakes

Total estimate
$ 15,160.05 ( This included oil change, transmission service, cabin filters, plugs and a few other maintenance things as well as above repairs)

So now we are still at a loss. My mechanic has taken it into a Nissan dealership, and they have said that all the sensors and entire truck basically just needs to be programmed correctly. Hooked up to their computer system so they can program the entire truck. They programmed it twice already, and still can't fix any of the issues. Does this make sense? Could the sensors just not be reading each other, therefore not performing correctly? Does anyone know if it is a simple programming job or does it take multiple tries?

We have checked brakes, rotors etc. Have put on 2 new rear tires.

Any other suggestions or what I should do next would be helpful.

There is a lot going on with your suspension... but you mentioned also about your brakes. Do you still feel sponginess when you press on the brakes... there may still be air in your brake system. Wondering if he bled your brakes properly( Front Left, Rear Left, Front Right, Rear Right in this order) Changing the brake hydraulic system has no affect in suspension, but is an entire different issue. Did your mechanic replace the brake pads too?

 

[soswald1975]

Ouch... At that price you can buy a certified used one with less problems. Did you buy this one Used? or are you the first owner? When did all these symptoms start happening? Let's start with the front end first... if the tires and steering wheel shakes only at certain speeds. Maybe you need to have your front tires balanced... what is the condition of the front tires currently?. Can you take pictures of the treads on the front tires(a frontal view and top view if your can). Tire tread wear can tell a lot about what your front end is doing. I don't doubt that your front end parts need replacement, but can't tell without inspection.

A bouncy rear end usually means... ( have you ever seen a vehicle in front of you while driving. That when they hit a bump their rear end bounces like a ball?) bad shocks... among other things. That might be happening to yours I'm also concerned about the condition of your under carriage. If they are pretty rusted out. Your rear suspension components may have all freezed up due to rust and are not function properly. Rear Air Suspensions (I have one) can be really bouncy and uncontrollable when hitting bumps (most especially if not towing). I'm changing my out with non-air after market components. Shocks and springs.

Sorry... but pictures here will really be helpful to help point out issues and better help from the forum. I hope this help a bit.

I bought it used a year ago, 2nd owner. Had it inspected by a 3rd party and everything came back clear. Front tires are in good condition, so alignment will be a good place to start. Infiniti and my mechanic has gone thru all the suspension components and everything seems to be functioning correctly. I keep being told it is a sensor/programming issue. There are so many sensors that if one goes out, if affects a multitude of other things on the vehicle. For example, the rear height sensor needs to be set to a certain millimeter. They set it to 19mm, helped a little. Changed the setting to 16mm and its worse now.

Brakes are spongy and my mechanic did bleed the system. No pads or rotors or calipers have been changed. He claims different sensors affect the brake sensors.

 

[toname]

I bought it used a year ago, 2nd owner. Had it inspected by a 3rd party and everything came back clear. Front tires are in good condition, so alignment will be a good place to start. Infiniti and my mechanic has gone thru all the suspension components and everything seems to be functioning correctly. I keep being told it is a sensor/programming issue. There are so many sensors that if one goes out, if affects a multitude of other things on the vehicle. For example, the rear height sensor needs to be set to a certain millimeter. They set it to 19mm, helped a little. Changed the setting to 16mm and its worse now.

Brakes are spongy and my mechanic did bleed the system. No pads or rotors or calipers have been changed. He claims different sensors affect the brake sensors.

Sensors will ONLY tell you that something is wrong with your Truck. If it is really a sensor/ programing issue. I would think your dash will be lighting up like a christmas tree right now. Sensors won't fix machanical issues. Like a shaking steering wheel or a spongy brake pedal.

 

[ppointer]

I was having some similar ride problems, though brakes weren't bad. Ours is an '08 we bought new and now has 66k miles. I bought Bilstein B6 for the front and Arnott's for the rear and took to the dealership for installation. Had way too much rust on rear suspension for an alignment, so I had most of the rear suspension replaced. This included upper and lower control arms rear, plus sway bar bushings front and rear. Replaced the height sensor for the air shocks and did a 4-wheel alignment. Added steel brake lines front and rear (fronts custom-made) and new calipers rear. Looks brand new underneath, and now it drives better than new - those shocks are way better than OEM. Cost all in was about $6k.

 

[soswald1975]

Appreciate the info ppointer. Spoke to my mechanic again and the mechanic at the Nissan dealership. There is still something not working on my vehicle they are trying to figure out. They are running tests programming it different ways i guess to try and produce a code to figure out what the issue is. They are hoping that once they figure this out, they can fix, and program the entire SUV to work in accordance. I will keep everyone update on the progress, but I do believe I will need to replace the shocks and have the truck aligned.

 

[gtech215]

I had a vibrating steering wheel at high speeds, 4 new tires and alignment fixed that. Definitely try upgrading your shocks and springs.

 

[soswald1975]

I think I have decided to replace the shocks/struts and get an alignment. See what that does and take it from there. I was on Summit Racing and looking at the Bilstein B6 shocks. They said they are NOT compatible with my vehicle, 2013 Infiniti QX56. But I did find the Bilstein B8 5100 that fit my vehicle. The recommended ones are Monroe OEM Spectrum. Anybody know anything about these or can direct me to which shocks/struts I should get to replace mine? I could do the Bilstein's in the front but I can't find anything compatible for the rear except directly from Infiniti.

2013 INFINITI QX56 Shock Absorber (Rear). AWD, STABILIZER, MEMBER - E6210-1LA8A | INFINITI, ORLAND PARK IL

Shock Absorber (Rear). AWD, STABILIZER, MEMBER. 2013 INFINITI QX56. Genuine INFINITI Part - E6210-1LA8A (E62101LA8A). Ships from INFINITI, ORLAND PARK IL

www.infinitioforlandparkparts.com

 

[ppointer]

For the front, here is what I have on my '08 QX-56: https://www.amazon.com/gp/product/B009FU6WM6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I believe the Bilstein model number is 4600. The 5100 will raise your ride height, so don't go with those.

For the rear, I went with Arnott from truckspring.com: Store Search - Find Truck & Trailer Parts Fast!

The Arnotts work better than I expected, certainly better than OEM. This whole setup with Bilstein in front and Arnott in rear transformed our QX to better than new.

 

[toname]

I think I have decided to replace the shocks/struts and get an alignment. See what that does and take it from there. I was on Summit Racing and looking at the Bilstein B6 shocks. They said they are NOT compatible with my vehicle, 2013 Infiniti QX56. But I did find the Bilstein B8 5100 that fit my vehicle. The recommended ones are Monroe OEM Spectrum. Anybody know anything about these or can direct me to which shocks/struts I should get to replace mine? I could do the Bilstein's in the front but I can't find anything compatible for the rear except directly from Infiniti.

2013 INFINITI QX56 Shock Absorber (Rear). AWD, STABILIZER, MEMBER - E6210-1LA8A | INFINITI, ORLAND PARK IL

Shock Absorber (Rear). AWD, STABILIZER, MEMBER. 2013 INFINITI QX56. Genuine INFINITI Part - E6210-1LA8A (E62101LA8A). Ships from INFINITI, ORLAND PARK IL

www.infinitioforlandparkparts.com

I depends on whether you want to keep your current air suspension intact or convert to conventional shocks and springs. If you want to keep in intact, then go with @ppointer recommendations' otherwise here are your other options. Rear Air Suspension Delete - 2WD. Owners have done this with much success.

 

[soswald1975]

ppointer - The Bilstein 4600 doesn't fit my vehicle. That is why I looked at the 5100. Can adjust them from 0-2" front and up to 1" rear. Why not go with Bilstein front and rear? Arnott only compatible up to a 2010 vehicle.

toname - Going to keep the current air suspension

Bilstein 2 5100 Series Struts and 2 5100 Series Shock Package - SHOCKINGBIL5100W-FRTSTRUT

Whether you're looking to maintain, optimize, or upgrade, we offer competitive pricing on Bilstein 2 5100 Series Struts and 2 5100 Series Shock Package - SHOCKINGBIL5100W-FRTSTRUT for your Truck or Jeep at 4 Wheel Parts. With our selection of quality brands and expert advice, we help boost your...

www.4wheelparts.com

 

[ppointer]

Ah, apologies, I had forgotten the 2013 QX56 was different from my '08.

 

[soswald1975]

Ah, apologies, I had forgotten the 2013 QX56 was different from my '08.

No worries. Directly from Infiniti Dealership, have found each shock and strut for roughly $200 each. So I guess I can go factory or Bilstein.

 

[primoV8]

Alignment on these trucks, just like the first gen WA60/JA60s, get out of spec quite easily, especially the rear end. Find a reputable, competent tech/shop that actually knows how to align a 4WD vehicle with IFS AND IFR suspensions. There are many who don't and will rely just on aligning the front end and call it a day. Always request a printout of the before and after before agreeing to have an alignment done.

OP, from what you had posted, it seems your Z62 has the HBMC suspension (hydro-filled) along with the standard air leveling rear. If an alignment is done and your truck is still having these suspension issues, then your HBMC system wasn't repaired or bled properly.

 

[soswald1975]

Primo, appreciate the advice and will check that out

 

[primoV8]

Primo, appreciate the advice and will check that out

Keep us posted. The purpose of the HBMC suspension, albeit an old, dated design that still works, is to keep the truck planted on uneven road surfaces and when taking swooping turns without the aid of anti-sway bars.
Get the alignment done first since you did have several suspension related components changed. As long as everything checks out green in the alignment specs post alignment, now all you have to rule out is the HBMC suspension itself if the truck is still bouncing and swaying all over the place.
If there are no visible leaks in the HBMC components ( lines, fittings, shocks, accumulator, etc.), then the system wasn't drained, refilled and bled correctly.

 

[soswald1975]

My mechanic hasn't noticed any leaks after changing a brake line, hydraulic line, sensors and checking the fittings, accumulators etc. The mechanic at the Nissan dealership is still trying to program the computer to the correct specs I guess. No alignment done to this point, but that is going to be my next step.

They still can't figure out the soft brake pedal. Now thinking it may be the master brake cylinder/computer.

 

[2infiniti]

I think I have decided to replace the shocks/struts and get an alignment. See what that does and take it from there. I was on Summit Racing and looking at the Bilstein B6 shocks. They said they are NOT compatible with my vehicle, 2013 Infiniti QX56. But I did find the Bilstein B8 5100 that fit my vehicle. The recommended ones are Monroe OEM Spectrum. Anybody know anything about these or can direct me to which shocks/struts I should get to replace mine? I could do the Bilstein's in the front but I can't find anything compatible for the rear except directly from Infiniti.

2013 INFINITI QX56 Shock Absorber (Rear). AWD, STABILIZER, MEMBER - E6210-1LA8A | INFINITI, ORLAND PARK IL

Shock Absorber (Rear). AWD, STABILIZER, MEMBER. 2013 INFINITI QX56. Genuine INFINITI Part - E6210-1LA8A (E62101LA8A). Ships from INFINITI, ORLAND PARK IL

www.infinitioforlandparkparts.com

Just more data....I have a 2006 QX56. Replaced struts with new Monroe struts and noticed zero difference. I threw them out and put on Bilstein shocks and new strut mounts and the ride is much better.