My car is misfiring when under boost. Now here is the catch, it seems to only do it from 3rd gear and on. Im running the NGk tr6 plugs and i have the coolingmist injection kit with a 50/50 mixture. But it does it weather the meth is hooked up or not.... Anyone have a clue??? its going to a car show in a month and going on the dyno in front of alot of people and i dont want misfires....
01' Z24 5 speed
422whp/400wtq
T4 Turbocharged
Built LD9
HP Tuners
Could the spark plug gap be off and blowing out your spark? I believe i have heard of that problem before.
Regap your plugs and see what that does. I gaped my at 25.
Does it only misfire under boost? What about low-load boost?
Mine has had a misfire issue under heavy throttle load, 4500 rpm's and up.. but I suspect it's a lean misfire and will deal with that issue this season.
A bit more detail would help!
-Chris-
-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
SweetnessGT wrote:Does it only misfire under boost? What about low-load boost?
Mine has had a misfire issue under heavy throttle load, 4500 rpm's and up.. but I suspect it's a lean misfire and will deal with that issue this season.
A bit more detail would help!
-Chris-
thats kinda what mines doing... but it doesnt do it all the time. i scanned my pcm and got a cylinder 1 misfire.
01' Z24 5 speed
422whp/400wtq
T4 Turbocharged
Built LD9
HP Tuners
mine gives me a misfire code when under boost, at half throttle though. i know mine is from being too lean because my MSD pump is a POS.
Veritas Aequitas
what do you have your plugs gapped at? When I got my 2.4L S/C kit on my car last summer GM recommended the .50 gap But I was getting big misfires under boost. So I gapped down to .30 and no more misfires. I'm also waiting to get my MSD coil swap installed but I have no mounting brackets(as I'm waiting for information in another post). So I hope once I get the coil swap in so I can increase my gap a little.
Check your plug gap would be first start. Also get your coils tested.
i have them gapped at .045 i have brand new msd coils with the 2.2 coil swap.
01' Z24 5 speed
422whp/400wtq
T4 Turbocharged
Built LD9
HP Tuners
gap them to 30...i regaped my tr6's to 30 and she ran like a beaut
you scratch my ride IMA EAT YO CHILDREN
yep, that is the only issue i can think of when it comes to the gm s/c for the 2.4l- is to gap your plugs a little smaller .
Make sure your car is at full temp before you get into boost and regap them plugs to .030 or .032 . I know when I got into boost when my car was not warmed up yet I would misfire badly.
Equipt with Replacement for Displacement components
well i regapped them today to .035 and it seemed to go away a lil bit but now it only happens around 6 grand. ill regap them tomorrow to .030 and see if it helps...
01' Z24 5 speed
422whp/400wtq
T4 Turbocharged
Built LD9
HP Tuners
