Low end power

[FoSHO]

Hey eveybody!! Well I got this small problem. My car doesn't pull at all until 3K rpm. Once the secondary runners open up then it feels strong. Since I have a hole size of 2 cd's in each muffler, do you think that might have a big impact on the low end since it might produce some kind of backpreassure problem? I was thinking if you run with no cat nor resonator just some straight trough design mufflers then how will the car run? I am a bit confussed here. Thanks for help.

 

[MelectroK]

secondary or two are stuck open

 

[sdpatt]

You should verify that the secondary buttlerfly valves in the intake manifold are in fact closing when the engine is running at idle. There have been pictures posted in this topic regarding the positioning of the levers on the vacuum actuators for these valves so that you can visually verify their positioning. If the secondary intake runners are open all the time, the low end torque, below the 3,950 rpm opening point, will be less than expected.

The problem could also be an engine control system problem. Try running the EEC codes to check for these conditions.