mkriebs

Are you certain its spark blowout then? Could it be knock? We need to go for a ride with my data logger and see whats really going on!

Spanky's Monkey

iTrader: (6)

i had the same problem before at 5psi and the plugs where at factory gap. i gapped em at .035 and it went away.

mkriebs

Hmmm odd. We'll see what .028 does for you!

Spanky's Monkey

iTrader: (6)

odd? you're telling me. at first i was gonna go ballistic cause i thought it was fuel until reality struck and i remember the gap was over .040 and that's when it hit me. i regapped them went for a spin and it pulled harder and hit 5psi with no problems after that.

mkriebs

Hmmmm, almost seems like it could be a weak spark, in all honesty. Without hearing/feeling it, I can't be certain though.

Spanky's Monkey

iTrader: (6)

i hope not. the icm has about 1500 miles on it and the coil pack aint much but plastic. if i've got a weak spark issue i'm going to need some real help with this. she's on her way so it'll be a bit before i can check this out.

mkriebs

Yeah, it SHOULDN'T be a spark issue, but ****, IDK why it would be blowing out with such a cool plug in it. What plug are you running? You're positive they aren't fouled?

Spanky's Monkey

iTrader: (6)

they are brand new as of the day we built the engine. autolite xp 5263 plugs. when i pulled them the first time they were perfect.

Spanky's Monkey

iTrader: (6)

she just got home gonna go pull the coil-pack so the plugs can cool.

Spanky's Monkey

iTrader: (6)

so i gapped em and it seems to have worked. tried to pull like a freight train but i got out of it quick. it leaned out to 15 as i rolled into about 3/4s throttle but continued to pull without the "burping". i'm new to boost but im almost postive that this is not bad. correct me if i'm wrong. i'd be deathly concerned if the car tried that at full throttle.

mkriebs

It shouldn't lean out at boost, regardless. If you leaned into it slow enough to stay mostly out of boost, then that should be ok. Otherwise, it should be running sub 13's afr at any substantial boost, especially on a fresh build.

Its good that gapping the lugs fixed it. You might need to go even one step cooler when you up the boost more.

Spanky's Monkey

iTrader: (6)

do you think these 39lb inj aren't helping?

mkriebs

Not sure. I would have to look at some data logs and see the IDC's. It seems they may be a bit small. Some 60's would work wonderfully (or 80's and E85!).

Tundraboarder666

I'm running more power than you on 39's and I beat up on my car all the time, so It sounds to me like it could be a tuning issue... Did you have Vince tune you for 10 PSI? I have my plugs gapped at .033 and have 2 steps colder.

Spanky's Monkey

iTrader: (6)

it could be tuning at this point but my other problem is fixed. what'd somebody say about custom cars with custom problems......lol.

Tundraboarder666

hahaha

Spanky's Monkey

iTrader: (6)

working on that injector fueling now. tundra how's your idle in park?

kxrida2000

iTrader: (12)

wat did u re gap your plugs to?

Spanky's Monkey

iTrader: (6)

.030 didn't have .028 on my gapper.

kxrida2000

iTrader: (12)

and that fixed ur problem? they were gapped at wat before .33?

Spanky's Monkey

iTrader: (6)

.035

kxrida2000

iTrader: (12)

ok great hopefully this will help my misfire issue im having im gapped at .35 now

Tundraboarder666

Idle is kinda rough... gets a little lean and then makes up for it by going rich down to like 13.5. It has never stalled out on me though.

Spanky's Monkey

iTrader: (6)

so it's not just me on idle then. i'm having a real hard time with my LTFTs. Vince is convinced its a leak but i'm showing vac @ 20inHg and i have yet to find any leaks. LTFTs are stupid high.

kxrida2000

iTrader: (12)

i have the same idle issue i do not have any vac leaks either