I recently bought a 2005 e320 gas base model with 85k miles. I notice 2 things that bother me. 1: the transmission seems to feel as if it shifts funny between gears during slow acceleration. It is like it begins to shift smooth then all of a sudden grabs hard and drops the RPM's low. This only happens when I am slowly accelerating. I have noticed that if I mash the gas a little while it is shifting it does not do this. But I have had other low end cars like Lexus, Nissan, Chevrolet, Honda, Ford,ect. and they do not do this. When I accelerate medium or high speed it does not give me this "jerk". Why does MB e320 shift funny during slow accelerations or is this a problem. I had the ATFluid changed and it still does it. Also I notice a faint whining sound when it is in gear, but ifI put it in neutral the whining subsides. I can't narrow this whining to a location because I don't want to exit the car while in drive. 2:The engine seems to run/sound differently for the first few minutes. I have noticed that it ticks for the first few miles/minutes. This sound has nothing to do with temperature but rather to drive time. I have listened thoroughly under the hood and it appears to be a ticking sound coming from the pulleys, belts, or a/c compressor. None the less the tick is louder in the lower section of the engine where the a/c compressor/pulley is located versus the top cover where the valves are. The really weird thing is that if I listen/focus hard enough I can almost feel this ticking almost minimally vibrating in relation to the sound. It is like I can feel the tick tick tick vibrating in the steering wheel and gas pedal until it subsides. Like I said it does not matter the temp gauge but rather the amount of miles/drive time to subside or go away. Anybody had any similar experience? These things really bother me after purchasing such a luxury sedan. I expected it to be extremely quiet and smoothe shifting. Mechanics say there is nothing they can find and no codes in computer but it just does not seem right....

 

Sounds like a hydraulic lifter is taking some time to pump up. If one has collaposed it will pump up but it takes some time.

The only cure is to replace the lifter and you normally replace all of them when you do.

A quick "repair" would be to do an engine flush. Any quick lube place can do this. It might wash out whatever is keeping the lifter from pumping up or it might not. It will clean all the gunk out of your engine, though.

Suggest this to a mechanic and let him keep the car overnight. Once a lifter is pumped up it can take hours to bleed down. If the mechanic can be the first to start the car and knows what he should be watching for he might be able to tell if this is your problem.

If this is not repaired it will eventually get to where it will not pump up at all and you can burn a valve. This could take a while to get to this condition, so you don't have to run right out and get this repaired tomorrow (assuming that is what it is)

Idcelr8

 

Do you know about how much it would cost to have the lifter and push rod for the defective one replaced?