Alright so i threw the P0300 code the other day, so i changed the plugs and tried again. then my interceptor said from 8- 22 misfires at any moment. i checked the gap and everything and it appears fine, and the new plugs are fine. its mostly misfing in cylinder 1. i need help

 

u need to check ur distributor and ur wires....







































oh wait..im on a cobalt forum lol

 

hahah funny joke. Not

yea dude, sell the balt.

 

could my plug gap make this occur

 

what did u gap them to? and what plugs?

 

autolites from intense. and there gapped at .035

 

The problem with the cobalts ignition system is that the best way to diagnose a problem is to install a known good part. If you have aftermarket plugs in you car get rid of them. Improper plug resistance causes coil and module failures. Your looking at a new coil cassette or control module and the only way to figure out which is to either have a GM tech diagnose the problem or plug in a known good part. Best of luck

 

bump

bump

 

ok guys...here is whats up...he has checked his plugs, re-gapped...no fouling...he was getting a misfire on cylinder one, then he swapped injector with injector two. the misfire followed to cylinder two...

the misfire is only at idle and low rpm...and since he just put in some flow matched 60#'ers, im guessing there is an issue with that injector and it is running a hair lean at such low idc's....anyone got any other ideas?

 

bump for help

 

Trust me, you are not alone on this. I know of at least 15+ other people with this same problem. Its a Cobalt thing. Lol

If anything, the car is running to RICH at idle, not too lean. I will be able to let you know soon, we are hooking my buddies Wideband back up to my car. I will keep you posted.

 

ok will do man i appreciate it. i'm going to pm me my cell number

 

sounds like you even have a bad plug or plugs, or one of your injectors has a short in it.. if you have a friend around with a cobalt ss try using his harness on yours to see if thats the problem

 

well i just put 2 more brand new plugs in 2day and i have no friends with 60's around here

 

the harness is the same for the 42s cuz i had 42s a long time ago with the harness and i used 60s with it. and no problem

 

theres no other kids with even stage2 around me

 

i have the same problem but my car misfires every time at like 3500 rpm..it just sputters, but if i keep my foot down then it feels shitty but does go more!! but i alos got the p0300 at idle twice, and i knew this already so it didnt really matter...im gunna change the tune, and put in new coil packs...anything else u guys recommend?

 

Oh. well try to find someone some what close to you and see if yall can meet half way to switch for like 10 minutes and see if that is the problem.. thats my best guess instead of buying another harness when that might not be the case

 

it blows dont it man. i wish we could figure out whats going on

 

i would change the harness and plugs... cuz sometimes the harness can short out..

 

i hear ya man it fukin sucks

 

hmmmmm. i'm gonna hVE 2 TRY THIS

 

changed the plus mulitple times, and changed the gap multiple times!!! how can a harness short out thoe???

cuz i heard the coilpacks can go bad, and i might replace my Crankshaft positioning sensor..wut yali think??

 

i know bro. tell me about it. i dont wanna drive it cause i dont want anhything to happend to it.

 

exactly, and i hate not being able to punch my car ...let me know if u ever figure this out lol and let me know!!