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Hi Abe, I can't seem to find the original post either. I have an 89 760 turbo (B230ft)W/104K miles. The car has always (I bought it used W/73K miles) had problems with low power and recently has been missing violently on an intermittent basis. It has become more constant and seems to happen after a certain amount of time during my daily commute ( worse in the evening after sitting in the sun all day). I have recently replaced all the high voltage items. I just changed the power stage, fuel pres. reg., fuel filter and fuel check valve. I have checked all turbo hoses and inlet hoses for leaks and have cleaned the communtator on the idle control valve. I have also checked the vacuum lines.
Most resently, I have noticed that the car ran well after I had messed with the knock sensor (ie R+R, cleaned connector, different torque settings, etc). Yesterday, while test driving the car and it was severely crapping out, I removed the sensor to check the resistance. Noting an open circuit, I was scatching the pins with my VOM probes to insure contact even though the pins are very clean. As a result, I was tweaking the pins back and forth a bit. I seemed to be getting a reading from time to time after tweaking the pins. After awhile, I couldn't get anything but an open circuit. I replaced the sensor and the car ran great! As a matter of fact, It has never ran this well. Excellent power in and out of turbo. Much more like I expected. I'm currently thinking that an intermmitent failure in the knock sensor has been retarding my spark under normal conditions.
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