somethings wrong
 

This happens only on WOT. About 5000-5500 rpm it makes popping noises out the exhaust. I am a newbie to this. Could it detonation inside the combustion chamber with the popping noise exiting through the exhaust. Please help, I dont want to break anything.

450 cc DSM injectors w/resistor box
255 lph walbro pump
AFC hack
MSD BTM set at .1
fmic

Re:somethings wrong
 

backfiring. ignition problem. cap/rotor worn / wires too fucked (doubtful) or plugs gapped to loose. Replace cap/rotor/[wires] and tighten plug gap to .30. I had teh saem problem. it'll go right away.

Re:somethings wrong
 

Thanks, i had a similar problem.

Re:somethings wrong
 

I will hve to try that, bu tmaybe I should replace the STOCK wires with MSD wires also.

Re:somethings wrong
 

wires are wires. They won't change anything at our HP level. They either work or they dont.

Re:somethings wrong
 

Yeah, especially if the car did work at one time and now it doesn't work properly. I mean sure you can get arching in your disty and cause problems with the wires, but I think you should definately check out the disty first.... MSD isn't going to fix a problem like that.

Re:somethings wrong
 

I know the cap is over 2 years old, and the rotor was replaced this past summer. Could timing cause backfiring?

Re:somethings wrong
 

try the cap..


my car does that popping noise too once in a while when i shift or rev it in neutral.

Brand new dizzy, rotor, cap, wires, plugs. Regular oil changes.. I don't have a clue what does it. my car does stumble a little on idle but doesn't stall (but comes REALLY close some times).