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I found a great article out there on the interwebz which explains this very well (and confirms my line of thinking) for the BMW M62 engine. I'm sure the explanation is pretty much the same for other engines of the same type. Basically, the author of the article states these engines do not have rocker arms, but instead uses a cam on lifter on valve setup. ...


2

My first suggestion was going to be the wheel bearing. It still might be one of the rear bearings. I had this problem with my '06 Pontiac and the wheel hub (including bearing) was surprisingly cheap and easy to replace. You should be able to inspect the rear bearings much the same way as the front bearings. My second suggestion would be the CV joints. The ...


2

I've worked on the lifters in a Dodge 6G72 engine ( and also the Dodge 2.2/2.5L engines). The lifters are oil filled. There is a tiny valve on them that allows oil in. When the vehicle has not been run for a while, or runs low on oil, the lifters will loose oil. As oil pressure build up, they will 'pump up'. So the issue is not that they are sticking, ...


2

You need to identify exactly where the sound is coming from. To do this, jack up the front end and put it on jack stands. If it's what I'm thinking it is, you can probably keep the tires straight, then have one person hold one tire while you turn the other. If the noise is coming from the differential, as you are saying, you are probably going to need a ...


1

It sounds as though your serpentine belt is worn out or that the tensioner pulley is not doing it's job (or both). As you start the engine, there is a high draw on the battery, which power must then be replaced via the alternator. When this happens, there is a large demand put on the alternator. If the serpentine belt or tensioner are not up to the job, then ...


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You're probably right, but it could also come from the inside of any of the exhaust components. A failed catalytic converter can be VERY noisy. Once I had a failing front-muffler/resonator too and it was producing a rattling sound at low speed. That would also explain the echoey sound. The best way to determine that is to hit every single exhaust component ...


1

It sounds as though your serpentine belt is the issue. The serpentine belt is connected to each pulley (a pulley is the circular disc that the rubber belt travels over) of various engine components (power steering, AC, turbocharger if you have one, etc) and as such has a lot of tension on it, but can't have too much. It may be that the dealer installed a ...


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This may be a longshot since it only occurs when accelerating, but it could be the rubber hood stops under the hood squeaking. You could try turning them out one or two rotations to see if that stops the squeak, or add some of those furniture foot pads underneath. This sound is most noticeable over speed-bumps or potholes. I had a squeak in my 2011 ...



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