ok i got an 04 rsx type s with 50k miles. i got race headers and everytime i down shift it sounds like the headers hit something ok thats that. when i got the headers the check engine light came out i was already expecting that, sometimes the idel is ok something it goes so low the car turns off,, alright yesterday i was on 5th gear and i was gonna down shifted to 4th gear and i ****ed up and went to 2nd i quickly took it out, but today on the morning my idel is dropping low and sometimes when i get to a stop the car would turn off, could it be a sensor or did i ****ed up something? need help thank you

 

You need a defouler asap...also what header are you running??? Sound like your header didn't clear your front sway bar so check that as well. Make sure your bolts are properly torqued. Your car sounds like its running in limp mode which explains why its running horrible...

 

While your at it you might want to upgrade your Engine Mounts and Sway Bar if you haven't. I am running a Megan RH...and i had to purchase a new Primary o2 as well as extend my secondary and put a defouler on my secondary. I upgraded my engine mounts to Innovative poly and the car handles and responds so much better, but get your codes read and let us know and we can go from there...

 

i got the same headers as u, megan rh i been having them like for almost a year. so i dont know if my sensor is already gone or i could still buy that defouler.

 

Ahh well i recommend both to be honest. Just a heads up your Primary is going to cost $180 minimum. And DO NOT i repeat DO NOT buy anything that is Denso or OEM. Anything else will not lost very long and also do not buy a used one. Just look on CRSX for the defouler trick or you can look up a BLOX defouler thats what i got for like $12...

 

scratch that its not limp mode . i was on limp mode a while back but thats because there wasnt a certain amount of A/F getting to me so it engaged limp mode where it would let me rev past 4500 i beleive. turns out i forgot to my gas cap at the gas station ROFL! just threw a new one back on and voila! problem solved .

When he downshifts it could be a motor or tranny mount or OR the header clearence .

I think you have an air escape somewhere.

 

thanks guys well ima go ahead and buy the defouler and make sure my headers and exhaust bolts are on place lol

 

I you want, you can also install the em2 swaybar if you want to keep your sway. I did this when i put my dcrh on. plus i have a k24 so it sits a little higher

 

well so i went to autozone bought me the defouler and did the trick and bang! check engine light is off idel back to normal and i been driving it back and foward from home to work and so far everything seems ok. thanks guys