Join Date: Mar 2010
Location: Alexandria, VA USA
Vehicle: 2001 SLK320 Sunburst Yellow
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Taking my 170 in for a tune up
I have recently purchased a 2001 SLK320(170 V6) with 40k miles on it.
I have driven it for approximately a month and have noticed very recently, like over the weekend, a significant loss of power at low RPM's. Also there is now a hesitation when I hit the gas quickly, it takes a second or two for the power to kick in. It feels almost like a 4cyl.
I have also noticed the loss of power at higher speeds, for instance when I first got the car I used to be able to go from 40-75mph in nothing flat and it would pin me back against the seat. Now it goes slower and after about 50mph seems to struggle to get over 3000 rpms, it just takes it's time.
I have an appointment on Monday to get a diagnostic run and to check everything out. What should I tell them to look for? From scouring these forums I have come up with a few things;
-MAF sensor. It sounds like this might be the problem, however I don't have a check engine light and the car doesn't have many miles on it.
-Gas pedal sensor. This might be it, but I don't know if they can test it or just have to replace it.
-K40 thing. Not sure what this does.
Any other suggestions? Does it just need a tune-up? Thanks.