Those are fairly mild bolt ons. The P0H ECU shouldn't have any problems with them.

 

Yeah, thats what I thought. So I think ill focus on the EGR gases potentially raising my intake temp so significantly. The coolant is supposed to cool down the gases but I don't think its doing its job.

 

Remove and plug vacuum hose from EGR valve. Does the performance problem go away?

 

Ill try that out. I suspect an exhaust leak at the header. The heat wrap has small spots that are white and worn. I can feel a little air but not enough to be sure its coming from the header. But that wouldnt do anything to the EGR would it?

 

I wouldn't think so. The EGR uses so little exhaust gas volume. But fix the leak. Exhaust leaking in the engine compartment might make its way into the cabin.

 

Yeah. Well its a suspected but not confirmed. My car has gone back to how it was before now, the ECU has adjusted after moving the IAT sensor to a cool location.

It literally feels like the pedal is heavier and the car responds quicker at random times but now its back to where I can floor it and ill get some speed but not like before. Almost as if I was in a higher gear at the same speed. Thats the difference in throttle I get randomly.

Maybe it is an exhaust leak then... So I need a new header and front pipe. This is a 421 that extends longer than what you would see on the dc header for f22's. Should I go with the should runs for more low end torque or do the headers with the longer runs provide enough low end torque anyway?

 

The TPS reads 1/2 volt closed throttle, 4.5v full throttle, and a nice, smooth voltage transition between the two?

 

I will check the voltages. I can only read % from my ecu. Ill try with my multimeter.
TPS has been a suspect in this but it always reads 9% at idle and 49% at full throttle. Perhaps the actual voltages would suggest differently?

 

I don't know about percentage readings from the ECU. Maybe you're using a scanner to read percentages? If so then IDK; I don't own a scanner and have never used one. Sorry.

Intermittent bad throttle response could be a TPS going bad. It's just a potentiometer, and pots can go bad with age/use. Manual trans TPS/throttle bodies wear out faster than automatic's. What throttle body did you use with the F23 manifold swap and how many miles on that TB?

 

I have an obd2 bluetooth adapter that i use with my computer but it only gets % readings from the ecu for the tps. But I can use my multimeter directly to the wire.

That makes a lot of sense and I spoke to someone with an lx who had starting issues in the cold and he said that they had to replace the tps. I guess on the 5th gen manuals they tend to go bad. I really hope thats it.

I used my own f22 TB and as far as i know the tps is original with 194k on it.

Would a bad tps dominate how the pedal literally feels too? heavy or weak when i push down. an indirect effect of different amounts of air rushing through and the throttle being open at different positions despite what the tps says?