STBEAST Posted January 3 Report Share Posted January 3 Hello everyone, I have a 2021 Edge St with 13,000 miles. It just developed a rattling sound underneath the car when I rev up the engine. I can be in park or driving. There is an exhaust rattle around 1900 to 2200 rpm. Very noticeable when I rev the motor a bit while in park. Especially as the motor is decelerating. Seems to happen only after the car has warmed up a few minutes and is definitely in the exhaust system. I took it to a local Ford dealer, and they were too busy to take a quick look. Trying to get some feedback before I take it in. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
TourGuide Posted January 3 Report Share Posted January 3 (edited) Sounds like a loose heat shield to me. Describe your symptoms as you have here to give them the best shot at tracking it down. Dealership service departments hate these things btw - time sinks to them. Important to you though so just insist they remedy the issue. Edited January 3 by TourGuide 1 Quote Link to comment Share on other sites More sharing options...
Haz Posted January 4 Report Share Posted January 4 From the 2019 Edge Workshop Manual... 309-00B Exhaust System - 2.7L EcoBoost (238kW/324PS) 2021 Edge Diagnosis and Testing Procedure revision date: 02/20/2020 Exhaust System Symptom Chart(s) Symptom Chart: Symptom Chart - Exhaust System Verify the customer concern. Inspect the components of the exhaust system for obvious signs of damage or other mechanical concerns using the following chart. Visual Inspection Chart - Mechanical Mechanical Exhaust pipe pinched or crushed Damaged muffler Broken or damaged exhaust hanger brackets Damaged catalytic converter Damaged exhaust passive valve Loose or damaged heat shields Verify the exhaust system is installed correctly, with clamps correctly located and tightened to specifications. If the fault is not visually evident, determine the symptom. GO to the Symptom Chart below. Symptom Chart: Symptom Chart - NVH Condition Possible Sources Actions Rattle, squeaks or buzz type noise — from the bottom of the vehicle Loose or damaged heat shield INSPECT the exhaust system for loose or missing heat shields or foreign material trapped between the heat shields and the exhaust system components. If any heat shields are loose, INSTALL worm gear clamp 7L5Z-5A231-AA and tighten to 7 Nm. If the heat shields are missing or a rattle, noise or buzz condition persists, INSTALL a new heat shield or component as necessary. Loose or damaged exhaust isolators VERIFY the exhaust isolators are correctly installed. INSPECT the exhaust isolators for wear or damage. INSTALL new isolators as necessary. Damaged exhaust isolator hanger bracket INSPECT the exhaust system components for damage or broken hangers. INSTALL new components as necessary. CHECK for loose or damaged exhaust hanger brackets or fasteners. TIGHTEN the bolts to specification or INSTALL new components as necessary. Loose or damaged catalytic converter or muffler MOVE the exhaust system to simulate the bouncing action of the vehicle, checking for exhaust-to-body contact while moving the exhaust system. Using a rubber mallet, TAP on the exhaust components to duplicate the noise concern. Lightly TAP on the muffler, then the catalytic converter. DETERMINE if there are loose or broken baffles in the muffler or a loose or broken element in the catalytic converter. REPAIR or INSTALL new components as necessary. Exhaust grounded to chassis INSPECT for signs of exhaust components-to-body contact. REPAIR or INSTALL new components as necessary. Exhaust passive valve INSPECT the operation of the exhaust passive valve. REPAIR or INSTALL new components as necessary. Drone or clunk type noise — from the bottom of the vehicle Loose or damaged exhaust isolators INSPECT the exhaust isolators for wear or damage. INSTALL new isolators as necessary. Exhaust grounded to chassis INSPECT for signs of exhaust components-to-body contact. REPAIR or INSTALL new components as necessary. Whistles, boom, hum or ticking type noise — noise tends to change as the engine warms. The noises are often accompanied by exhaust fumes Exhaust system leak INSPECT the entire exhaust system for leaks. CHECK for punctures, loose or damaged clamps/fasteners, gaskets, sensors or broken welds. EXAMINE the chassis for grayish-white or black exhaust soot, which indicates exhaust leakage at that point. To magnify a small leak, have an assistant hold a shop towel over the tail pipe outlet while listening for a leak. REPAIR or INSTALL new components as necessary. Catalytic converter MOVE the exhaust system to simulate the bouncing action of the vehicle, checking for exhaust-to-body contact while moving the exhaust system. Using a rubber mallet, TAP on the exhaust components to duplicate the noise concern. Lightly TAP on the muffler and the catalytic converter. DETERMINE if there are loose or broken baffles in the muffler, or a loose or broken element in the catalytic converter. REPAIR or INSTALL new components as necessary. Exhaust muffler/resonator drain hole enlarged due to corrosion CONFIRM the drain holes are the noise source. INSTALL new components as necessary. Hissing or rushing noise — high frequency sound and the vehicle performance is unaffected Exhaust system Exhaust flow through pipes CHECK the exhaust system for leaks. Using a rubber mallet, TAP on the exhaust components to duplicate the noise concern. Lightly TAP on the muffler and the catalytic converter. DETERMINE if there are loose or broken baffles in the muffler, or a loose or broken element in the catalytic converter. REPAIR or INSTALL new components as necessary. Pinging noise — occurs when exhaust system is hot, engine turned off Catalytic converter/exhaust system Cool down pinging is a result of the exhaust system expanding and contracting during heating and cooling. This is a normal condition. Vibration — occurs at idle and at low speeds. Also accompanied by a clunk or buzz type noise Loose or damaged exhaust isolator INSPECT the exhaust isolators for wear or damage. INSTALL new isolators as necessary. Loose or damaged exhaust isolator hanger brackets INSPECT the exhaust isolator hanger brackets for wear or damage. INSTALL or REPAIR as necessary. Exhaust system grounded to chassis REPAIR or INSTALL new components as necessary. Engine drumming noise — normally accompanied by vibration Damaged or misaligned exhaust system INSPECT the exhaust system for loose or damaged fasteners or isolators. REPAIR or INSTALL new components as necessary. Sputter type noise — noise worse when cold, lessens or disappears when the vehicle is at operating temperature Damaged or worn exhaust system INSPECT the exhaust system for leaks or damage. REPAIR as necessary. Thumping noise — from the bottom of the vehicle, worse during acceleration Misaligned exhaust system CHECK the exhaust system to chassis clearance. CHECK the exhaust system isolators for damage. REPAIR as necessary. Engine vibration — is felt with increases and decreases in engine rpm Strain on exhaust system isolators REPAIR or INSTALL new components as necessary. Drumming noise — occurs inside the vehicle during idle or high idle, hot or cold. Very low-frequency drumming is very rpm dependent Exhaust system vibration excites the body resonances inducing interior noise REPAIR or INSTALL new components as necessary. Good luck! Quote Link to comment Share on other sites More sharing options...
kruzr1 Posted January 5 Report Share Posted January 5 The midsection heat shield on my 2019 ST probably causes some noise. Some of the mounting ears where they attach to the body are broken so it's not as solid. I have a replacement but haven't figured out how to remove the old one yet. Quote Link to comment Share on other sites More sharing options...
STBEAST Posted January 5 Author Report Share Posted January 5 Thanks for ALL the good info. I did narrow it down to the midsection of the vehicle and found a YouTube post of an identical year vehicle with the about the same miles. He recorded the sound and it was identical. He said his ended up being one of the mufflers which I believe was the resonator. Going to do some more troubleshooting before I head back to the dealership. I'll post my outcome for sure. Thanks Guys! Quote Link to comment Share on other sites More sharing options...
STBEAST Posted January 20 Author Report Share Posted January 20 Well, it ended up coming from the resonator. Something internally came loose causing a rattling noise once the exhaust was warmed up. Horrible sound. Luckily it was a warranty issue. Thanks so much for all your support! 1 1 Quote Link to comment Share on other sites More sharing options...
Brandy1979 Posted March 11 Report Share Posted March 11 Hi i have a 2020 Ford Edge ST with 34,000 miles on it. There is a noise coming from under what sounds like the center console when i drive on the highway or freeway at about 50 mph and above its is under the car somewhere. kinda like a rattle sound, I took it to my local dealer they said they couldn't find any issues they tightened a bolt but that was it, i got it back and now its a different kind of noise still similar to the rattling noise coming from under the car. does anybody have any ideas of what it might be? Quote Link to comment Share on other sites More sharing options...
johnmarkp Posted March 12 Report Share Posted March 12 Ii might be the old fluttering noise problem. Easy to diagnose. See this thread. Quote Link to comment Share on other sites More sharing options...
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