OK, my car bogs like crazy and i have no idea why. it totally sucks. why do FC's bog? i'll be accelerating untill....BRICK WALL **durrrrn du du dud durrn dut dut poo poooooo rnnn** ahh i fuking sucks! i am hesitant on accelerating hard for fear that it will bog again.
my car usually does thin in second gear, sometimes in first. and the brick wall comes around 2k.
ive tried new plugs, wires, did a groudn from teh tranny to the firewall; those all stoped teh bopgging for a little while, but it comes back. i also set my TPS. can a TPS be broken and still read teh correct ohms?
would pressure in the gas tank have any effect on this? because i dont think my gas cap door is doing its job, considerig the fact that everytime i unscrew it i hear PSHHHHHHHHHhhhhh.

well, help me if you can, cuz i really hate my problem.

 

There's supposed to be pressure in the gas tank, and clean all of the OEM grounds, run some injector cleaner, and verify that the TPS is good, just because it sits at 1ohm doesn't mean it's good, if it blows open or sits at too many ohms when it's over 25% throttle. There's a thousand different things to do.

 

have any check lights or codes?

 

check feul filter, and rest of system, i had the similar problem but around 3.5-3.8 k, i adjusted the tps to 1 ohm and i was good...also check your grounds, i think theres a faq abiout this one

 

Bogging...can be a few problems.
secondaries not kicking in or bad(or dirty as hell)
thermo sensor bad
(S4) AFM tlited at a severe angle
Check if there are error codes as a start

 

how do you cheak for codes?

 

now that i think about it my problem is probably a busted thermo sensor, the sensor looks old and dirty but what really makes me think the bogging comes from the thermo sensor is teh fact that i only have teh problem when the engien is warm.

 

I'm having the same kinda things, but I really was doing well for awhile after I changed my injectors. Where is the thermo sensors on the S4?s Is it the one that's down on the radiator's bottom left corner when looking at it from the back?

 

i think its right behind the alternator.