I just recently bought an S5, to replace the old S5 I, unfortunately, lost in an accident.
So just like the title says, when I'm idling (750~RPM) and I give the pedal a hefty stab, the car chugs and bogs, usually
it'll fight its way up and rev out, it gets smoother from the 2k mark upwards.
Smoothly giving gas there is very slight hesitation but it's very pronounced with a WOT from idle.

Fuel filter is new, tank has 6 ish gallons of gas and is premixed.
MAF recently cleaned and I've sealed the intake up, no leaks there, replaced the HKS mushroom filter since that was missing.

My only thoughts are a bad TPS, and my timing may be off. I've tried and failed to adjust my TPS since I'm inept apparently haha, I'll be giving it another stab tomorrow after work if possible
Does anyone have anything else that comes to mind?

 

welcome to the board.

you can get a copy of the FSM here: Foxed.ca

i think checking the timing is the first move you should make. get it sorted. however, since you mentioned a "failed" attempt at adjusting the TPS, then definitely sort it out as well.

 

Thank you for the welcome!
I'll try both of those next day I get to work on the car, if the problem persists after that, what do I check for and tackle next?

 

in my mind, the next thing on the list would be perhaps the secondaries (the circuit) needs a look ...

 

So I measured the TPS voltage, and I don't know if I'm doing it 100% right or not, but I'm back probing from the top right wire on the TPS when it is upright. (Grounded to chassis)
So at idle, it's reading 1.13 and at WOT it reads 4.69
Only thing is, it'll go smoothly from idle to 50%, but it stays at 4.69 from 50% to WOT.
Am I doing this wrong or is my TPS broken?

https://imgur.com/a/jGwZ6tm

 

here's a good thread to assist you: https://www.rx7club.com/2nd-generati...-101-a-235007/

 

Im battling this as well right now. My TPS bench tests fine, AFM is new, I had some injector wiring issues that I resolved, premix fuel in the tank, Grounds cleaned, tried 2 different ecus(Rtek1.7 and stock N332), spark at all plugs, noid tested primaries(secondaries test potentially inconclusive), New Fuel Filter, New Fuel pump, Clean Lines... Im running out of options.

Oh and lowest compressions is 88 psi on 1 of the surfaces.

 

If it's not misfire, could it be fuel starvation? Have you called Racing Beat at (714) 779-8677 (Pacific time from 8 to 5 Mon-Fri). They can give technical advice even if you're not a customer.