It keeps reading the code P0303 "cylinder 3 misfire". All coil packs, fuel injectors, spark plugs have been replaced. The exhuast smells normal. The oil is the correct color(maple syrup color, NOT milky). It's not blowing through coolant. Compression test came back normal. It's not the cat converter because the exhaust doesn't smell like rotten eggs. The car is sometimes hard to start. it hesitates/stumbles and shakes really bad. It feels like its not getting enough power. It's always had its routine maintainence work done as well(oil changes, etc)..
Anyone have any advice on what's going on or what to do next? I. Completely at a loss on what to do.
Before I replaced the fuel injector yesterday it pulled codes P0303 and P0300. But after I replaced them it went away and I started driving, got maybe 3miles down the road, and the engine started to stumble and feel like there was no power to accelerate. When I turned around I did the code reader and it only said P0303 again.
.as far as the fuel pump, That could make it run real low in power and have random misfires, But not just cyl 3 which is the code the car is pulling up(P0303). If it was the fuel pump it would probably pull code P0300 which is random/multiple engine misfire.
you might want to take another look at the converter. that it doesn't smell like rotten eggs isn't a very good diagnostic. a clogged or clogging cat will cause the exact same issues your having. other than that, it sounds a lot like a fuel pump problem. loosing pressure and not delivering enough fuel.
there's only so many things that can cause a cylinder misfire, and you've replaced the plug and coil pack. could also be a crank or cam position sensor. but it could be that cylinder 3 is the first one to misfire and that's the code it's storing.
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