Car stalling/ not getting enough power like before/engine light coming
 

Hi,

So my car was fine until i had gone to a shop to install BHR ignition coils, add the HKS twin power and spark plugs. They did that but after a while the car after i had pick it up, suddenly while driving, the car loses power, then it wont start. The reason for not starting was that it was not well grounded.
After couple days i went to a Mazda dealer and they told me that my car needed an update on the ECU for loss of power. They did it, and my car was working well, like before.
then, after couple days it lost power...the car got hick ups as i hit the accelerator..it seems that not enough air is going through. Cant get through 8 rpm, car stalls..struggles to have power..it's very slow now..when im trying to get its full power like reaching around 8700 rpm, as the marker struggles to pass that the check engine light comes on.
I took it to some shops and they cleared the engine light but it goes on and off sometimes..There was a time they used the scanner and said it was the O2 sensor..the most expensive one in front of the catalytic converter. I got that one installed but it stills the same.
Yesterday, this guy said that the scanner read something like "circuit 2 misfiring"..i guess it has something to do with one of the spark wires on the ignition coils..

What can it be? How can i get my car back to normal??? I spent money already for nothing!!!

You have the BHR coils AND the HKS Twin Power?
My first guess is to remove the HKS because there is no added benefit anyway.
Might want to wait for someone from BHR to jump in and help/clarify.

You also want to verify the coils are wired to the correct plugs.
Coil order is: R1L R1T, R2L, R2T.
https://www.rx8club.com/attachment.p...3&d=1210514054

i forgot to mention, i dont have anymore the HKS twin power. i didnt quite use it..I'll ask them to check if they have the wires installed correctly.

Thanks

PS:any other suggestions?

it wasn't firing properly and sent a bunch of fuel into the cat and destroyed the cat

Hi my car was struggling to start and when it did it would struggle to pick up an then die down and die out. so i got it checked out at the mazda garage and they said that i had blown my cat. when loooking online i find that my cat is the whole exaust system or part of it, so if i was to change my exaust system which would lead to an increase in power would it work again ? if you could get back to me cheers

^thread crapping lol

Yea my first guess would be to make sure those plugs are connected properly. If it was working fine before then something had to have gone wrong in the install.

The coil sequence is Front of car to rear of car. L1,T1,L2,T2. Make sure the wires are in the correct order. Just like in the pic Jon316g posted.
It sounds like the catalytic converter is bad. As Zoom44 said.
After a drive look at the exhaust around the front of the passenger door. See if it's glowing red.

Ok..I'll see what i can do. If the cat is actually bad i might as well get a new one..actually i'm thinking of going with the BHR midpipe and borla exhaust later on. is the borla exhaust for FI or just for NA? Is the greddy turbo exhaust a good exhaust?

nop..the cat wasnt glowing...