andrewr

So my car started to randomly misfire and i have no idea why. I'm not throwing a code but you can definitely tell thats its misfiring.

My mods are very basic:
O2 housing
Downpipe
Cobb intake filter
EBC
Tune on 22psi

I bought new plugs and wires. If anyone has any idea please help. Could it be a fuel injector possibly and how would i test if it were??

J8dailo

iTrader: (33)

misfire at wot?? or idle

crazybaldhead

is it misfiring? Or breaking up at WOT with full boost? If it is the latter it may be your plugs, might be the wrong type, or gapped wrongly.

Make sure your wires and plugs are installed properly as well.

chu

iTrader: (72)

Sounds a lot lik ea spark plug issue. What kind of plugs are you running, and what did you gap them?

Berts24

iTrader: (3)

try doing a boost leak test

D-Mon3y69

iTrader: (47)

if its misfiring just all the time start with plugs. if that doesn't fix it then you can go to wires and coil packs.

andrewr

it misfires at WOT and idle. I have not changed the plugs since i bought the car last summer, but i have ordered new ones and new wires. I have not ordered coil packs yet because i am going one step at a time.

mrevoix2006

iTrader: (2)

mine did this with the spark plugs gaped wrong changed them an got them gapped right an now its perfect

andrewr

would the gap on the plug change over time because i havent changed them and it just started misfiring?

andrewr

so i changed the wires today and it still seems to be misfiring. how would i check to see if a coil pack has gone bad?

mdsevo06

iTrader: (41)

I picked up a used set with less miles then my original coils, on this site. I've seen some used sets on here go for less the $100.

TcJayLee

Id check the spark plugs and see if theyre gapped properly.

andrewr

Is there any way to check the coil pack before having to replace it?

glennji

bump

darkside4G63

iTrader: (1)

need more details. speed, rpm, boost, no boost, gear, etc.. too many things can cause the appearance of a "misfire." how do you know its misfiring? does it just feel like it is misfiring? have you tried to pull codes even though the cel isnt on? have you performed a boost leak test? also, check your maf (honeycomb, connections, etc.).