hey guys, i drive an 2003 evo 8, and i just installed the pregapped NGK BPR7es in the car. AFter i went for a drive, the car starts sputtering and it feels like its going to die when i start breaking, what can the problem be? whenever i accelerate it runs fine, but when i break for a stop, the car sputters and feels like it doesn't have enough power to keep on.

 

Check if the spark plugs are gapped correctly!

 

how do i check that?

 

get the little round gap measuring tool from your local auto store. it will be called a gap feeler. how is your idle?

 

thanks phil, when i leave the car idle, it sputters and it feels like its going to die, but it doesnt die.

 

I had the same problem with my iridium plugs. The gap was way off even though they were supposably pre-gapped.

 

Do you have any work done to the car? The gap should be set to 32 at stock and 24 when increasing boost and ignition timing. do you have management or evo scan?

 

no my car is pretty much stock besides an injen intake with upper ic pipe, and an ams intercooler. so maybe i should buy a tool to check the gap? and how would i gap them? do i need another tool?

 

does the tightness of the sparkplug matter? i screwed it in not too loose, but not too tight.

 

15 ft/lbs

 

What should the gap be for moderate bolt ons

 

Set your gap to 24-27 on the gapping tool. And yes, them being loose will affect the way you car runs.

 

cool thanks everyone. im going to buy the gapping tool tmrw and see if it gets fixed.

 

sounds good. i would also look at getting evo scan and the patch cable. you might be able to find one on here from a vender. good luck tomorrow and let us know how it goes.

 

thanks phil! i will!