I have trailblazer with 2004 ls L6 220k just replaced motor with a replacement that. Has 100k a lot of parts are brand new Fuel pump water pump spark plugs coils alternator ecm radiator replaced tons of sensor almost everything you can think of my car has no power when I start it it starts up it Idle pretty bad can’t get rpms to get 1500 and Boggs out when I hit gas I don’t have check engine lights I don’t know if it’s the catalytic or fuel issue I swapped the fuel pressure regulator and still nothing the throttle dosent open up all the way I swapped throttle still nothing my motor isI need car back on road ASAP any tips would be appreciated car had

 

Check the 5 VDC reference voltage that goes to both the throttle body and the electronic fan clutch. If there is no 5 VDC present, both the throttle body and fan clutch will not behave normally. If the 5 VDC line that supplies the throttle body and fan clutch grounds out, the PCM won't like the condition and will not allow the engine to rev up much. In this condition, the Reduced Power light should be illuminated.

Also, check your fuel pressure and the fuel filter. You should have between 50 to 57 psi. If the pressure is less than that, then you need a new fuel pump. I suggest going with an ACDelco OEM pump. I used to recommend the Delphi pumps but for about the last year, I have been hearing from disgruntled techs about the quality of Delphi parts going down hill and into the garbage can.

Good Luck!
































































































































































































































































































































































































































































































































































































































































































'''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''''''''''''''''''''''''''''''''''''''