metalmechanic

Just installed Kooks Headers & Y /w high flow cats. slp ldmth 1, check light and lots of fuel consumption. My plugs are AC DELCO IRRIDIUM, My gap is set at .040. Any suggestions. Thanks much.

teke184

iTrader: (5)

last i checked stock for the ls1 was .060" gap

sroach20

iTrader: (31)

leave the gap where they are, it changed to .040. you either left something unplugged, cracked a plug, or tore a wire.

LANDONZ

iTrader: (23)

i put tr55s without changing the gap, and installed msd wires.. Car runs like **** now and I am getting alittle misfire to in the 6 and 7 cylinders. thinking of changing back to a delco plug.

shdybrady1988

iTrader: (3)

I bought plugs from cnc on here and they were sent to me at .56 and the ones i took out were at .55-.57. No codes and they are running fine

blackLS1m6

iTrader: (14)

what codes?

shdybrady1988

iTrader: (3)

me? Im not showing any codes.

metalmechanic

Yep it was the gap, running fine now. Its weird, no one can give a proper answer. When i changed plugs about 5 months ago, the original were at .055, the ones i got from auto store told me to go .055, i went to .040, which were fine for stock ls 1, but after mods, it ran super rich and idled too high, so yesterday took them out, cleaned them up and broke tip off of one. Went buy a new one and he said the gap should be .040. I went too .055 and is fine, after 5 full days of doing and redoing car is awesome.

sroach20

iTrader: (31)

which plugs? if you got the tr55s you should be at .055. the tr6 and tr5s should be at .040.

LANDONZ

iTrader: (23)

i got another set of tr55s and took them out, two were broken/cracked. Put 8 more new ones in there and BAM, runs perfect now!

metalmechanic

i have ac delco irridium gapped at .055