qinfujun

Any help would be greatly appreciated!
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Year: 2003
Make: Honda
Model: Civic EX, manual transmission
Engine: 1.7L sedan 4 Cyl ,
Mileage: 58,000

Stored:
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0300 Random Misfire Detected

upcomintuner

Is it overheating any? And you could check your spark plugs for cylinders 1-3 or try switching one of those 3 coils to cylinder 4 to check the coils.

It Wasn't Me

Have you done or had any work done to it lately?

fsanchezsmith

i had a similar issue and fixed it with some cleaner called seafoam. u can buy this at a local aoutosupply store. suck up the liquid through the pcv. i havnt experinced any problems since.

justinsbg

Usually when the PCM stores a "random misfire" code along with cylinder specific codes it's ignition related. Have you replaced your spark plugs? They're due for changing on that model at 110k. If you have more than that on it I would change them. I would only use the NGK factory plugs. They're expensive but it's worth it in the long run. You also may have a failed ignition coil, especially if the spark plugs have significant mileage on them. If it's consistently misfiring under all running condtions, try unplugging each coil pack individually. You're wanting to see if when you unplug a coil pack if the engine runs any rougher or doesn't change at all. If the engine doesn't run any worse with a coil pack unplugged then that is the problem coil pack.

hondarsr

Hey bro I had the exact same problem w my 02 ep3 , I even got the same codes u have exact the problem is the camshaft it self I can bet 100 bucks the lobes are worn and grinded down and im sure tje rockers are no good as well.... Check the cam shaft this was a big problem in 02-03 civics especially si model.honda fixed the poor designed camshaft problem in late 03....hope this helps buddy

atkach

do you have any aftermarket parts?

dealer_tech

Does your gas gauge seem to move around alot, like taking turns and hitting bumps? I just thinking this may be fuel pump related, the plastic shell that houses the pump tends to come apart. Thus the pump kinda just flops around and could starve the engine of fuel. Just a thought.

subworm07

I just had the exact same problem and like hondarsr I fixed that and the coilpacks and no more problem. oh and I got a 02 civic ex