bulletpound

so for the past 6 months i been gettin p0300 and i cannot find out wtf it is, its driving me CRAZY!!, only happens at idle, wot and cruise car is fine, and my afr would go lean and car would start to almost sound like its blown or its chocking, than it goes little rich and back to normal.

ITS NOT THE TUNE, have had same tuner, tune for 2yrs now ( yes i have gone to get it twikd once in a while to make sure things are fine)

these are the things iv done to check wtf is wrong

-changed plugs
-switched around coils ( to see if its happening in a specific cyl)
-seafoamed
-fuel filter change

- havnt checked injectors but i dont see why it would be the injectors because WOT is fine which would mean the injectors arnt plugged/stuck.

SOMEONE FIND OUT WTF IS GOING ON

P.S mods are
2.8
60lbs
zzp intake
ottp h/e
ottp dual pass
ottp opt b
vibrant header/dp
gmpp catback
1step colder plugs
exedy hyper single

recklessactn

iTrader: (1)

I throw the misfire code too, but I dont have any of the problems youve described. Is it normal to throw a p0300 code from time to time with 60's in?

bulletpound

from time to time yes its fine, but for me drivivng from point A to B i will be a millionaire not to get a CEL stopping at a red light

recklessactn

iTrader: (1)

What are you running your gap at?

elecblue06

iTrader: (1)

60 s do weird things.. and will do an injector misfire depending on how you have your idle tuned.. if you have tuned for 14.7 which is normal you will experience it where it'll spike to like the 20s and **** which is not good.. this is due to the small injector pulse width that needs to be commanded on a pencil style injector. what people do to get around this is to tune it for high 12 - mid 13's at idle and it alleviates most of that problem.. but thats not something that will cause a spark miss.. i would look at your plug gap for that

be warned though tuning it for 12-13's at idle will through a (too rich at idle condition) code.. but that can be turned off

ddsscobalt

iTrader: (1)

mine does it alot too... everything is fine the 60s just have that affect

PerformanceClutches

i haven't turn off my code yet but once i get the time i'll just be turning off this code. i get the same thing and right now my car has the engine light. i get random misfire and i think 1cylinder too lean. it happens most the time just sitting at idle. if i leave it running in a parking lot for 5 minutes it will get it and come up. i have to drive a bunch of miles or after a while it will turn off. MAX we can just turn this code off for you next time that's what i am about to do with my car turn off that and also 3rd cylinder lean bank code or one of those.

bulletpound

.032

mine is just a p0300 random, never a specific cyl.

does anyones car afr peg like 19-20 afr for like 4 secs and car bucks then back to normal, and misfires?

PerformanceClutches

i have aem wb. i think it's set on like 0 and my friend said when it starts up it shows u have it on setting 0. Your supposed to set it to 2 or something apparently. my car when driving is usually between 13.8-15.2 or somewhere. b/c it's on settin 0 it moves all the time and is fast updating. if you put it to 2 it will look like it's always around 14.7 is what i've heard from my buddy who owns a srt4.

if i am drivng and come to a stop for some weird reason i've tuned the car and had it tuned and re-tuned it myself and now had someone else tune it the car always will shoot up to 17afr's or something high and i am nervous but then it comes right back down to normal after 2-4 seconds. so it will come back to 13.8-15.4 or somewhere around there. idk if the wb updates too fast but my friend said we have to take it out and change the setting it's on from 0 to 2 then he claimed it will not do that. IDK?!?! when i plug in hp tuners pro and data log it looks like my afr is fine at idle or during a wot pull.

i have similar mod's to you and my gap is like .38 i think. i had .32 and also .34 and seemed like the car ran like crap for daily driving.

recklessactn

iTrader: (1)

yea try setting the gap at a .36 or .38, I've noticed a difference on my 2.9 when i had it at .40 having some backfire and then re gapped it to .44 and that seems to be the sweet spot.

bulletpound

does your car buck or make a diff exhaust sound while its at 18-17afr??

i was going to take out my injectors and check if there sititn properly and clean, but i keep thinking if they weren't sitting properly or clean my car would run **** in a specific cyl and wot would be ****, so i been on the fence on that

my car backfires like no tmro lol, reg driving between 1-2 it back fires

PerformanceClutches

yeah i was thinking about buying new ngk bkr7e's and gapping them to like stock gap or a higher gap like .44 or something b/c i noticed even when i am at .38 i feel like it's too small of a gap. i know .32 or .34 ran like ran and now it's so so but never tried to go .44. i should try that.

to the OP. the car makes a weird exhaust noise if u stand behind it like the car is going on and off. not one steddy sound. not sure if all cars do that or just mine but u can hear at idle it's like diping high to low as if the rpm's are changing slightly. i would say buck but that just sounds bad. i think you and i have the same problem or same thing happening. it's been happening ever since i got 60lb injectors and a custom tune.

eurochevy

ya i dunno i've had them since i bought the car same thing as u ..although i dunno about my afr's and stuff plugs have been done a few times..injectors twice coils moved/ replaced etc etc...no idea's just annoying when im sitting at the light and the thing is freaken shaking me around

raptors_67

Bump the idle rpm up to alleviate the pulse width problem of those injectors. Should go away and you won't have to idle rich that way either.... assuming all else is setup correctly

Fonzi1289

Sound like u need a new ICM

elecblue06

iTrader: (1)

this is another way to fix it.. i just don't like having a high idle