I recently started get ting misfires on cyclinder 2 . I swapped coils to see if the misfire would follow ,but it didnt. I have ngk iridiums and i dont if its the plugs or the 60lb injectors or something else?

 

If you are getting misfires only on #2 it should be a p0302 code. p0300 is a random cylinder misfire code. That being said what are your plugs gapped to? It could be injectors or plugs but either way if it is p0300 and not p0302 it shouldn't be anything to worry about. I get and clear this code pretty much everyday

 

Well the problem is the car is sputtering when going 2 second gear. or hard accerlation. Plugs cant be gapped , o reillys said they couldnt be gapped becuase of the iridium.

 

It would be easier to start with soapy water and spraying around your injectors. Get a boost leak tester and check for leaks. Chances are you will either expose an injector that isn't seated properly, or a bad o-ring on your injector housing. If there's no leaks, then I would go ahead and pull the plugs and see what your gap is.

I'm assuming your an lsj, correct? You shouldn't put iridiums in there anyway. A lot of people will argue with me on this point, b/c everyone thinks iridium is so ******* awesome. Go back to O'reilley or "Vato-zone" or wherever, get the NGK's that are suppose to go in that block and make sure to gap them properly.

 

Correct lsj. So with that be said should I gap my plugs to .035 since im.lightly moded. And copper?

 

4644 is the stock number to the ngk 1 step colder plugs gap them to .032 some have had good luck with irridiums most havent

 

Even the 1 step colder plugs are usually iridium, they just have a copper core. And you can gap them, you just have to use an actual gap tool instead of a tapered gap gauge

 

the ngks that come with the lsj's are NOT iridium

 

wrong the 1 step colder plug for the lsj is not iridium can you get sure if you want

 

Im going change my plugs then and gap them. Ill see if the misfires/ sputtering goes away

 

By the way im not dynoed,yet ,would this cuase the sputtering?

 

curious how this is working out for you..? This was the start of my nightmare, which ended up becoming a bad oil retaining ring on piston one...

still not sure if they were related issues, but always had a random misfire that was later related to cylinder 1 which caused sputtering...

tried switching out plugs and new fuel injectors....thought everything was fine, then had the plug blow out...

i was running the ngk iridiums myself

good luck...curious if your plugs and propper gapping will help

ps getting dyno'd has nothing to do with the sputtering unless your gonna get tuned while running on the dyno

 

well i finally bought plugs and tried different gaps(.032,.034,.035,.036),but still getting a misfire . . What now look for a bad injector?

 

Is it misfiring all the time, just at idle, or randomly?

 

only under acceleration.

 

Could be a bad injector not pushing enough fuel. If the misfire is specific to a cylinder just swap that injector with another one and see if the misfire follows.

 

Any kind of acceleration? Or whenever you go into boost?

 

About 5 lbs of boost it varies. Sometime even lower, but ill try swapping injectors.

 

check your bolts that hold down your fuel rail. I bet there's one loose. Ask me how I know

 

I swapped injector 2 and 3 and scanned it . misfire followed to # 3. I then pulled the fuel rail and looked if there was any diffrences in spray patterns and surely there was,made a big mess. Im going to seafoam it now. Thanks guys for the help!..

 

i don't think sea foam will help it any. But you're more than welcome to try.

 

or intake manifold bolt is loose

 

did i mention 5 of my intake mani bolts were loose last time i did a boost leak test

 

Your right seafoam didnt work sucks. I called zzp and a ordered a new injector.

 

when you said you havent dynoed yet... do you mean you arent tuned?