Piston Slap: NVH Nightmares No More? (Part II)

Doug updates us:

Hello, just an update on this problem: an indy shop I had used before on another Mercedes put my 2007 S550 on a lift and diagnosed it with a failed transmission mount. Just a little $60 part at the tail end/output end of the transmission.

Because it had failed, the transmission was essentially resting on the frame crossmember, pretty much directly beneath the center console/armrest where I felt the vibration so acutely. I was skeptical it could be that simple/cheap, but sure enough it eliminated the problem! It’s super smooth and silent now. The other likely culprits, the flex discs at each end of the driveshaft and the center carrier bearing for the two-piece drive shaft, all look new and can’t be original. They must have been replaced by the first owner.

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Piston Slap: The Duratec Ranger's Mounting Problem?

Will writes:

Hey Sajeev,

My 2010 Ford Ranger XLT 2.3-liter automatic has been an amazing truck since I bought it new in 2010. Lately, I’ve got a vibration and weird sound coming from the driver’s side when stopped at a red light. It only occurs (or is noticeable) when it’s cold outside.

This sound occurred before and after I replaced the ball joint (driver’s bottom) as I was told by a mechanic at Ford it needed to be replaced.

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  • TheEndlessEnigma I would mandate the elimination of all autonomous driving tech in automobiles. And specifically for GM....sorry....gm....I would mandate On Star be offered as an option only.Not quite the question you asked but.....you asked.
  • MaintenanceCosts There's not a lot of meat to this (or to an argument in the opposite direction) without some data comparing the respective frequency of "good" activations that prevent a collision and false alarms. The studies I see show between 25% and 40% reduction in rear-end crashes where AEB is installed, so we have one side of that equation, but there doesn't seem to be much if any data out there on the frequency of false activations, especially false activations that cause a collision.
  • Zerocred Automatic emergency braking scared the hell out of me. I was coming up on a line of stopped cars that the Jeep (Grand Cherokee) thought was too fast and it blared out an incredibly loud warbling sound while applying the brakes. I had the car under control and wasn’t in danger of hitting anything. It was one of those ‘wtf just happened’ moments.I like adaptive cruise control, the backup camera and the warning about approaching emergency vehicles. I’m ambivalent  about rear cross traffic alert and all the different tones if it thinks I’m too close to anything. I turned off lane keep assist, auto start-stop, emergency backup stop. The Jeep also has automatic parking (parallel and back in), which I’ve never used.
  • MaintenanceCosts Mandatory speed limiters.Flame away - I'm well aware this is the most unpopular opinion on the internet - but the overwhelming majority of the driving population has not proven itself even close to capable of managing unlimited vehicles, and it's time to start dealing with it.Three important mitigations have to be in place:(1) They give 10 mph grace on non-limited-access roads and 15-20 on limited-access roads. The goal is not exact compliance but stopping extreme speeding.(2) They work entirely locally, except for downloading speed limit data for large map segments (too large to identify with any precision where the driver is). Neither location nor speed data is ever uploaded.(3) They don't enforce on private property, only on public roadways. Race your track cars to your heart's content.
  • GIJOOOE Anyone who thinks that sleazbag used car dealers no longer exist in America has obviously never been in the military. Doesn’t matter what branch nor assigned duty station, just drive within a few miles of a military base and you’ll see more sleazbags selling used cars than you can imagine. So glad I never fell for their scams, but there are literally tens of thousands of soldiers/sailors/Marines/airmen who have been sold a pos car on a 25% interest rate.