Thumping Sound from Roush CAI
05-16-2019, 10:05 PM
#22
Senior Member
Throttle Body Popping Sound
A few days ago I started noticing a strange, muffled, thumping sound coming from the engine area of my truck as I started it (See YouTube link below). It doesn't matter if the truck is cold or hot, the noise is present at idle just seconds after starting the engine. I popped the hood to get a better idea of where the noise was coming from and it sounds like it's coming from within the Roush CAI. The truck is a 2016 F-150 5.0L V8 XLT. I've had the CAI installed for roughly 6500 miles now along with an 87 Octane performance tune from MPT. Up until now I've had zero issues with them or the truck. I checked all of the connections to the intake and found nothing out of place. I took the filter and intake apart to see if there was something obstructing the air flow but found nothing. And finally I just tried reloading the 87 octane tune. But that didn't change anything either. So far I've noticed no difference in the way the truck performs or changes in idle speed. Has anyone experienced anything like this? If so, what's the issue/fix?
https://youtu.be/wYGYFiegzuY
https://youtu.be/wYGYFiegzuY
Sounds similar to the following, but different tone.
https://www.mustang6g.com/forums/thr...e-body.102999/
TSB
CUSTOMER SATISFACTION PROGRAM 18B34-S1
CPR © 2019 FORD MOTOR COMPANY
DEARBORN, MICHIGAN 48121
1/2019
CERTAIN 2018 MODEL YEAR F-150 AND 2019 MUSTANG EQUIPPED WITH 5.0L
ENGINE — THROTTLE BODY REPLACEMENT
OVERVIEW
In some of the affected vehicles, the throttle body in the vehicle engine may have been built with a
misinstalled torsion spring. A misinstalled torsion spring may cause illumination of the wrench light or
service engine soon indicator with reduced engine power.
SERVICE PROCEDURE
Recommended Tool List:
General Tools
1/4" Drive Deep Socket- 7mm, 8mm
1/4" Drive Extension- 3"
1/4" Drive Ratchet (Power and Hand Tool)
1/4" Drive Torque Wrench
Plastic Pry Tool
Magnetic Pick Up Tool
Pliers
1. Replace the Throttle Body. Please follow the Workshop Manual (WSM) procedures in Section 303-04.
2. Using integrated diagnostic system (IDS) clear any diagnostic trouble codes(DTC's) present.
05-17-2019, 08:39 AM
#23
Junior Member
Join Date: Jan 2019
Location: Fort Worth, TX
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I put a Roush CAI on my wife's truck the second she bought it. Been on for just about 50k miles. About 4mos ago I noticed the thumping sound as well. It can't be the actual CAI, it has no moving parts. So I went straight to throttle Body, took it off and cleaned it. Still thumps, but less pronounced.