squeeking at cold start?
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2007 CLK550
squeeking at cold start?
Hello Everyone,
Just picked up a 07 clk550 with 20k miles. On cold starts I would hear a squeeking noise coming from the engine compartment but it would go away after the about 3 to 4 minutes. Please let me know if this normal (as this is my first benz) or should I be concerned?
Car Idles smooth and drives like a dream otherwise. And also the clk starts up without any problems or delayed cranks.
Your input will be appreciated.
Just picked up a 07 clk550 with 20k miles. On cold starts I would hear a squeeking noise coming from the engine compartment but it would go away after the about 3 to 4 minutes. Please let me know if this normal (as this is my first benz) or should I be concerned?
Car Idles smooth and drives like a dream otherwise. And also the clk starts up without any problems or delayed cranks. Your input will be appreciated.
MBworld Guru
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It's probably the secondary air injection pump. It forces fresh air into the exhaust when the engine is cold to reduce emissions. Mine does this, too. It might be a symptom of eventual failure of the pump, but I wouldn't do anything about it until it actually fails and triggers the MIL.
Thread Starter
Junior Member
Joined: Jan 2013
Posts: 15
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2007 CLK550
It's probably the secondary air injection pump. It forces fresh air into the exhaust when the engine is cold to reduce emissions. Mine does this, too. It might be a symptom of eventual failure of the pump, but I wouldn't do anything about it until it actually fails and triggers the MIL.
I ask all this because I just got the car 2 days ago.
Thanks
MBworld Guru
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NO LONGER ACTIVE
I have just shy of 50K miles. It's done it for at least the last 10K, more than a year. It does take a few minutes before it stops (i.e. when the exhaust temp is warm enough that the ECU decides it no longer needs the fresh air injection). The air pump is easy to find - its a big motor looking think right on top of the engine, under the front engine cover. It has a hose coming out of the rear engine cover connecting to it.
Thread Starter
Junior Member
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2007 CLK550
with the vehicle standing at the dealer lot for a few weeks outdoor in the cold, is that a contributing factor for the squeeking noise at cold starts? Because it also seems to me that the squeeking noise has been quieter but now the car is also garaged....?
Thread Starter
Junior Member
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2007 CLK550
One last thing. When you put your car into drive or reverse, does your vehicle move pretty easy without giving throttle like when pulling in or out of the garage. I have a Lexus rx330 that moves and even picks up speed with out me giving any throttle. Again my car has only 20k miles. On the side note, there is no hesitation when I apply the throttle and the vehicle drives smoothly.
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MBworld Guru
Joined: Dec 2009
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No, mine actually requires a little throttle to start rolling, especially in reverse. It's better with the transmission in "S" mode as "C" uses a higher gear (and yes, the 7GTRONIC has two reverse gears).
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