Miss fire cyl1 after over heating
 

Tuesday on the way to take my wife to work the blazer over heated i left it in town went back today to get it an it ran rough. Got over to my friends house he checked the code an it had miss fire on cyl 1.Any ideas on what is wrong or what happened??

thanks rich

Welcome to the club.. i guess there is a few people having this same issue.. I know i am, and i've gone though almost everything and still misfiring.. And here in New York, can't get it inspected with emissions popping..

Edit:
https://blazerforum.com/forum/2nd-ge...cyl-1-a-83716/

thats the problem with new york inspection. my mech said it could be as simple as a plug or the wire for no.1 or the cap could have an issue

Yeah New York is stupid for inspections but it could be something simple as a plug and wire, but i know on my rig, my father and older brother replaced the plugs and wires, and more yet still misfiring.. If i can get it to quit on my rig i'll let you know what i did..

Causes

A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer



Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.



Edit:

Info was found here.
OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected