wierd

[project89]

alright after having problems with ym ign system,replacing the dizzy/pickup coil/ coil.and still having problems i decided to check the plugs/wires.
the first cyl i did was #6 i pull the wire off and the conector seperated from the wire.no big deal,but when i pulled the plug it was white.not lean white,but like out of the box new white,a few of th eother wires broke but all the plugs came out a nice tan color.i fixed all the plug wires reinstalled the plugs swaping the #6&5 plugs.started the car.it still idled smooth.but when i go under boost im back firing into the intake.

my ? is if the fuel injector is dead in #6 would th ecar still idle/run smooth.and would the plug be clean.and could this also be the cause of my backfiring

[90FormulaWS6]

backfiring into the intake is a classic lean issue problem... probably due to running very small injectors for your setup with no tune

[project89]

backfiring into the intake is a classic lean issue problem... probably due to running very small injectors for your setup with no tune
11.0-1 to 12.0-1 afr with wideband

[90FormulaWS6]

11.0-1 to 12.0-1 afr with wideband
i stand corrected

[project89]

only cyl #6 had a clean plug,and by clean i mean it looks like it was never in a motor(package fresh).All the othe rplugs were the prper tan color

[project89]

this is how ba dmy tach jumps around at idle.bte turn ur sound all the way down i had the system on when i took the lil video clip
http://lethal.ics-il.com/idle.3gp

[V]

if u really think its a bad inejctor, swap its position and see if the plug comes out different after running it a bit, and maybe stick a timing light pickup on #6 wire, just to make sure you are getting spark there

[project89]

yeah it get spark,dont know if th eplug is working though,imm gonna swap the spark plug tom when i can walk over to the parts store.the thing that gets me is
the car idles smooth,and runs smooth until i get to about 6-7 psi of boost then it starts poping back threw the intake.
thinking maybe it was pre ignition i evcen pulled an additional 6 degrees of timming at idle.was running 12* base timing now im running 6* base timming.
it even pops back threw the intake with the est unhooked

[project89]

ok since u guys have no idea'a on this im gonna swap out the plugs/wires tom,if that dosent fix it,it has to be the injector.anything other then that is gonna have to be a busted pistion or ring( i really hope not ive bene looking foward to running at the nats for some time now