ok so i drove a friends '03 E55 today that's for sale and i must say i fell in love with it right away, awsome sound, superb acceleration and incredible comfort. Just the perfect car for me at this time, but i noticed one thing which kinda bugged me, after taking the car on the highway i stepped on it all the way, and the pull was pretty smooth but when i looked at the speedo it was almost at 140, which was quite shocking to me (how quickly it got up there), i then stepped on it one more time before getting off the highway, when i came to a stop sign i puchned the car and it barely moved1 felt like the charger was not engaging, it took about a minute or two or regular driving before i stepped on the car again and it moved like it was suppose to. I took the car after that to my friends shop where he had it scanned and the only fault that came up was Intake Temp. Sensor, could that senson be throwing the ECU off, to make it think its running to hot and thus shutting down the charger?, or should i be worried that there is and issue with the supercharger alone? I really really love this car, and im on the brink of purchasing it but just want to make sure this does not turn into a big $$$ repair.

Thanks for any and all replies

 

He needs a new supercharger cooling pump (IC Pump). When he gets that, he'll not hafta wait to go to 140 again.

 

You've just experienced the most common symptom of the famous stock IC pump's intermittent failure. The stock Bosch IC pump does not just stop working, it gradually gets worse until it completely dies. When the pump starts failing, the intake air temperatures start rising, which causes the computer to rob you of power usually by pulling timing or preventing the supercharger from engaging. The good news is that it is a very easy fix. Most people on here have been using the Johnson Marine pump CM30 as a replacement pump with good results. LET (a decent sponsor on this board) sells the pump for around $175.

 

thanks guys anyone know approx how much it is from the dealer? or has a part number handy?

thanks again

 

What MB_Forever said is very good advice. Better to just use the Johnson pump. As I understand it there is an updated version of the stock Bosch pump that should last longer, though I am not sure they have been out and on the road long enough to prove it. So far the Johnson pump has a very good reputation for working as promised and not failing.

 

Just curious how this repair would work if you have a warranty? Could the CM30 be used without provoking any warranty issues from MB?

 

I am pretty sure they will not do that.