what should i check to fix a backfire? this happened after lt headers and pcm tune, it does the backfiring when you floor

 

Usually that means the car is pretty excessively rich. You can typically address it with timing and better fuel tables.

 

how can i do that? i got a tune from madz28, can he fix that?

 

My car idles at 1100 rpm, and backfires almost everytime I shift, would I fix that by tuning, or could some sensor be off? It has a pretty new IAC.

 

Ttt

 

you probably have some plug wires crossed.

 

Is it a comon problem with catless cars?

 

is there any type of hesitation or does it only do it during a shift at WOT? more than likely you have a "leak" in your ingnition stemming from the header installation. what type of plug wires are you running? make sure that they arent arching out on the headers. wait until night time and look under the hood with the car running. you will probably see a plug wire arching out.

 

plug wire arching out from the opti? o and this happened right after the pcm tune, not after headers, it didnt do this popping sound, and i have a high flow cat... and also i feel a little loss of power...

 

I think what he is saying is that you may have melted a plugwire on the side of the header, and when the wire contacts the header it archs which could be your miss/backfire.

 

i got otvc, where can i get a single piece from if i got it from thunderracing, if i got mine burnt? can there be any other things? how can one melted one cause a popping sound? and are there any other thoughts?
thanks

 

ttt, help please asap...