Some type of cut when boosting, but not fuel cut?

[spoolin_upTSi]

Hey guys. I have a 98 gst spyder and recently upgraded to an evo 3 16g, 550 injectors, 255 fuel pump, safc2, and afpr. Car ran great for about the last month. About a week ago I was driving and the car seemed to want to die. I made it to a parking lot and checked under the hood to find the plug to what I believe is the ISC unplugged (the one under the throttle body. Plugged that back in and good to go.

Then yesterday I was boosting and then the car seemed to hit some kind of cut, but there was no violent jerk or anything. When I pressed the accelerator nothing happened, but the car didnt die. I managed to roll into a parking space and looked under the hood with the car still running. It felt alot like what happened when i used to have IC pipes blow off. All plugs and IC piping intact. I pulled on the throttle cable and pretty much nothing was happening. After a couple of minutes of fiddling with the isc plug (because of the previous incident), it began to fluctuate between 1500 and 1800 rpms very rapidly. At this point, when i pulled the throttle cable it revved up like normal. I get in the car and turn it off. Fire it back up, and everything is fine!! Drive for a few minutes, boost it hard again, and the same thing happens exactly.

So when I am driving normally, everything is fine. When I boost it, the above happens. I have searched and couldn't find an answer. Could it be the plugs? I am running the bpr6es when i should probably be a step colder (switching those out today). Any other ideas guys?

 

[AlphaAssault]

Sounds like a boost leak, from the way you described it. Check yer piping.

 

[spoolin_upTSi]

Put in the new colder plugs and the problem is gone . If it comes back, i'll return to this thread.

 

[NateTheGreat]

Put in the new colder plugs and the problem is gone . If it comes back, i'll return to this thread.

what do you mean colder plugs?

 

[darkhorizon]

a "colder" plug dissipates more heat from the electrode than a "hotter" plug would. They do that by increasing the surface area of the electrode insulator. The idea is that the more power you add to a motor, the more the plugs need to cool down to prevent pre ignition or detonation. ALL spark plugs are designed to run a a specific temperature, one that is hot enough to prevent junk from building up on the plug, and cold enough to not ignite the fuel before it commands spark.

Basically the OP had a spark blowout issue, and fresh plugs fixed his problem, the coldness didnt help him much at all, although me might have an easier time running extra boost now. Normally plug temperature will not cause major blowout or misfires, unless its too cold and it fowls out too easily. foul'ing can be done by running to rich for your plug temperature.