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Jefferson posted a topic in Operation and Maintenance: 450 Model, 2005-2006, dieselHello all, I am new to the group and hope I have posted in the right area. I currently have 2 Smart cars. I currently have a 2006 Cdi and recently purchased a 2005 Cdi. I do not know a whole bunch of history on the car, but it will not exceed 3000rpm. There is currently no light on and no codes stored. I have pulled the EGR valve which is clean, then switched my solenoid from my 2006 CDI. Still no change in power. I had then switched clutch actuators between cars, still no difference. I can hear the fuel pump when i turn the key. I pulled the rear bumper and functioned the waste gate and inspected the lines and all looks good. Upon further inspection, I realized my exhaust manifold was once welded but has cracked again. I put my ScanGauge on and it makes roughly 3lb of boost. I realize I will have to replace the exhaust manifold, could this be the issue? Would anyone else have any ideas to check as well.