What is TDC on a PM3 head?

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have you checked to see what codes you are getting? pull back the carpet on the passenger side. turn the key on and count the flashes from the led in the computer.
 
My bad. I found the light on the ECU./ECM. It flashes 6 times with my engine light on. I checked a service manual and it says it's my coolant tempature. I don't have my sensor connected. Would that make my car act funny?
 
yes it can make it act very funny. The ECT sensor is a primary fuel control input. Without that sensor conneted the computer goes into limp mode and will run all kinds of funky.
 
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