P0303,p0304 cylinder 3 and 4 mistfire, Passat 1999 V6 like new
Stumble for a few seconds at cold start. I don't want to change evething, my father had the car before and went to the VW dealer for the same problem, they charge him $400 and didn't fix the problem. Please help me. 70000 Km
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My car was doing this and I had to get all new coil packs... Mine were replaced under recall at the dealership at no cost.
If you take each code and google it, or even check a VW forum, I'm sure the members there can provide a lot more thorough information......
I have a 2001.5 Passat myself and when one thing goes out they all follow suit.
I will help with some research for you and post back...... But I'd check the coil packs that sit atop the spark plugs.
coil packs very prone to failing... check compression for good readings (at least 100 - 120psi) if okay try new spark plug as these can fail under load and its the cheapest part to replace to eliminate. if misfire still present swap cylinder 3 coil with cylinder 1 coil and see if fault code moves to cylinder 1. hope this advice helps
P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4.
Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups.
When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.