Did you guys gap the plugs properly?

Usually the plugs are gapped way too wide for our application, so during boost you'll get a miss (the spark won't jump and ignite the mixture).

 

well we didnt have a gapper with us and the last ones were gapped properly...the new ones were pretty much the same size...we used a piece of metal to stick in between the two points and there was just barely a size difference...but i was told to gap now at .031 cause of higher boost application...
we'll do that in the morning, got a gapper now, and post how it does...

 

While you're in there, check the spark plug wires and connections, preferably with an ohmmeter.

Sometimes the wires break internally and cause all kinds of problems, that are hard to trace.

If the wire clips that attach to the plugs are loose, tighten them down with pliers, to make a better connection.

 

timing...

 

check your gap. for christ sake man a gapper is like 99 cents! jesus!

btw... 0.031 is too wide

lower it

 

While you're in there, check the spark plug wires and connections, preferably with an ohmmeter.

Sometimes the wires break internally and cause all kinds of problems, that are hard to trace.

If the wire clips that attach to the plugs are loose, tighten them down with pliers, to make a better connection.

thanks alot man i appreciate your help bro..

 

check your gap. for christ sake man a gapper is like 99 cents! jesus!

btw... 0.031 is too wide

lower it

haha on that already..well gap it alittle lower haha..
99 cent is alot these days you know haha joking man..
we found the gapper..

 

I been having the same problem,same setup except im running a vpc,walbro 255lph stock injectors,when i jump on it sometimes i get miss pops,rich backfires of black smoke.

My timing is perfect,champion coppers gapped to .26

I talked to some people about the subject,and what came up was the wires/clips for the coil packs,anf igniter,if they have a bad connection it will do it

 

not really misfire like it arcing through the boot but it backfires now.
get me wrong but isnt backfire mean your running rich?

in your situation, it certainly sounds like a misfire, but just an answer to one of your questions, and for future reference for people reading this thread, i have read about _lean_ mixtures causing exhaust backfires. i don't really understand the dynamics of combustion very well and was confused about this earlier, but i think the cause here is the excess oxygen from the lean burn helps combustion out the exhaust. this combines with the fact that lean combustion is not always complete combustion, and in fact is generally less complete than a richer burn. most lean-burn engines have attention paid to swirl and proper timing so the mixture's actually well mixed and combusts completely.

shiva