Clunk Noise On Left Side

Mark Mobile Technician Ontario Posted   Latest   Edited  
Unsolved
Chassis
2008 Ford F-150 FX4 5.4L (5) 4-spd (4R75E)
Can Duplicate Clunk When Driving 15 Km/Hr And Turnng Steerng Back And Forth

Hello all.. Im not a chassis /drivetrain noise specialist .I spend more time on electrical and driveability .However i have a family truck here that i have checked the front end ,ball joints ,control arms and bushings and i dont see anything obvious thats bad. As i mentioned ,i can duplicate the clunk if driving 15 km/hr and turning steering back and forth aggressively. I dont remember to check ball joints if unloading the system ( jack under control arm) or free hanging ,but i did both ways and still cant find a problem that is obvious. The stabilizer bar links look good but they look like a different design and dont have rubber bushings at the bottom attaching to the lower control arm. It looks metal but everything is intact. CAN someone give me some of their experience for common problems of this nature as i am out of tune with other suspension faults ,other than the ordinary… ..OH BTW .iT will also make a clunk when i go over some larger bumps that raise the suspension a fair bit. Small bumps ,i dont hear anything. Much appreciated

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Cmore Mechanic
Connecticut
Cmore
 

You said the stabilizer links are good but what about the frame mounting bushings? They are often overlooked because they will seem tight when the vehicle is jacked up. Put your hand on the stabilizer bar and have someone bounce the truck. Also try grabbing a shock absorber could be a bad lower bushing.

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Stephen Owner/Technician
California
Stephen
 

I would focus on those sway bar links. Any time you force the vehicles to sway side to side, those links can be an issue. I would see how ford sells them to see if it has that bushing. Usually the bolt breaks and they fall out. Also look at the sway bar mounts at the frame. They can knock if worn.

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Lonny Diagnostician
Florida
Lonny
 

Check inner tie-rod's

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Glenn Owner/Technician
Texas
Glenn
 

Hi Mark, Drivability includes diagnosing odd noises from time to time. The entire vehicle body flexes when driving. That is normal, but a pain when components start to wear with age. These noise issue can be a pain to find. I use an older (wired) Steelman Chassis Ear for these kinds of problems most of the time. Used ones are cheap on Ebay typically, if you decide to check into getting one…

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Mark Mobile Technician
Ontario
Mark
 

thanks glenn… I did have a chassis ear a while back but lost it in a shop fire. Yes some of these noises can be a pain to find if not obvious. That was on my mind to check body bolts next . Much appreciated for the feedback . Ill probably get back on that truck in a couple of days to recheck..Thanks again..

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Mark Engineer
Colorado
Mark
 

Mark Your time is too valuable, borrow a chassis ear or buy one. You’ll have an answer soon.

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Marty Technician
California
Marty
 

Since you're an electrical diagnostician, I'm sure you have a scope…less than $50 from amazon… use jumper wires to hook up to you scope and there ya go… Amazon​.​com STEELMAN Replacement Clamp Microphones for ChassisEAR Electronic Squeak and Rattle Finder Auto Diagnostics Tool, 6-Pack, 16-Foot Cables, Color-Coded Leads : Automotive Also, here's a demonstration on DN that might be…

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Mark Mobile Technician
Ontario
Mark
 

WOW​.​very helpfull. Thanks.

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Glenn Owner/Technician
Texas
Glenn
 

Hello Marty, I have microphones from an “early” Steelman wireless chassis ear kit. The receiver unit on them was battery operated junk and poorly made. I am trying to adapt the good microphones that are left to work with my Snap On Verus. I located such leads that were made by Jarhead diagnostics a while back, but they quit making them and will not answer any questions. Currently I am using…

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Marty Technician
California
Marty
 

FWIW, Sadel Martinez (DTECH) is making a nice adapter set for just this use. It gets rid of the wiring rat's nest/adapters/jumper wires allowing easy hookup to the scope . Think you might need the microphone's referenced in my initial post, but you can try to cut them apart if you're feeling adventurous. HTH

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Stephen Owner/Technician
Alabama
Stephen
 

We had an 07 Silverado that was in for oil leaks and major services. It had no noise when turning but we noticed the P/S rack bushings were almost completely gone. After we replaced them there was a Very noticeable clunk when turning lock to lock loaded. But not unloaded. Turned out rack was bad and I guess the worn bushings were masking that noise.

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