Georgekillsimports

my car is misfiring in cylinder #3 and Cylinder #1 but only at idle with the ac off when i turn on the ac at idle it doesnt misfire at all anymore and i don't misfire at all when the car is moving wierd or what how do i fix it i got hp tuners if its a tuning issue

Formula96

what is done to the car, what are your plugs gapped at, how many miles are on the car?

Georgekillsimports

2006 Victory Red Cobalt SS/SC
Fujita F5 CAI, ZZP ceramic header, ZZP 2.5 Downpipe, GMPP Sport exhaust, Aeroforce Interceptor gauge, AEM Wideband UEGO, HP Tuners, and Ingalls Torque Damper, 60lb injectors, 2.8 pulley, NGK iridium 2 steps colder, and gm shortened belt.
14000 miles

its not the plugs i switched them and it didnt make a difference

Formula96

i am sorry to be repedative, but what did you gap your plugs at?

never mind, they say not to gap those..

you can try swapping injectors around, maybe 2 of them have some **** stuck in them... see if the problem moves with them...

Georgekillsimports

lol i did that too i thought of both of those things before anything swapped injectors and same problem and i have no cat

Hockeyman

iTrader: (4)

bad tune?

Area47

give em a cookie!

something in the short pulse adder table is fucked, or the min pw is off.

Georgekillsimports

you know area you deserve a +rep you are so right too bad i figured out stock min pw is too low like .0904 i raised it to 1.102 and it is not misfiring but i have been retuning maf for like the past 2 hours almost got it settled again. but thats for the help

Area47

whats your short pulse limit set at?

Georgekillsimports

i found out the problem by comparing my car with the ac on and with the ac off

stock 0.904

Area47

no, not the min pw. the short pulse limit. the number right above the min pw.

2.000?
1.141?

montecarloman

Forgive me but I thought that iridium plugs where like platinum plugs in respect too you shouldn’t use them in a blown motor because of possible preignition

Georgekillsimports

area my short pulse is 2.000

Area47

set the mim pw to .094

then tinker with the short pulse adder table from there.

Georgekillsimports

lets say i leave it at 1.102 will it mess me up in any way? because ive almost got it tuned for 1.102

Area47

then id leave it.

::shrugs::