Keep a bad crankshaft sensor in mind also. http://www.doityourself.com/stry/symptom...
#1. Change the fuel filter first.
#2. Take your car to a Volkswagen Dealer and ask them to test the fuel pressure on the fuel rail pressure fitting under the hood. This is a very inexpensive test BUT the fuel filter must be clean to get an accurate fuel pressure reading. Low fuel pressure will cause the engine to miss. Plugged fuel filters are the #1 cause of electric fuel pump failures.
#3. We need the year of your car to be able to figure out which type of ignition system it has.
one or more cylinders in the engine failed which causes the entire engine to misbehave. A cylinder fails when the air/fuel mixture fails to ignite in the combustion chamber. When the engine is misfiring, it will shake enough that the driver can feel vibrations throughout the vehicle,
A "tune up?" There is no such term as to car engine since decades ago. Not possible to do a "tune up" since most things are electronic. Key word: electronic. Image an octopus with a center body and all of the tentacles. That is what modern engines can be compared to. There are items like the ECU, the MAF, coils, voltage regulators, environmental inputs from oxygen sensors and EGR valves and fuel fumes being circulated to control emissions. And you are guessing and replacing parts just because? And you wish to "narrow" possibilities? Kids like you try and try and each day they try guessing instead of taking the car to a mechanic for repairs. Most end up paying more in parts not needed, in time wasted, in pure aggravation as you appear to be. You write in total teen fashion, copying from the mistakes of others instead of using correct English, that your car is a VW passat. The name of the car is Passat, capitalized. V-6, is correct. 'v6 is not correct and you also repeat the futile, and expensive, guessing as to parts. Sorry, it just does not work in this fashion. Only a trained, certified and experienced mechanic, with knowledge and tools and testing equipment and ability to speak with other professionals can resolve the issue of this car. Do not be a fool. Go to a mechanic. And that is what should have happened from day one. go find one. If you wish to be qualified to repair vehicles, sign up and take a mechanic's course to be certified. Otherwise, allow them to do their job.
The codes indicate that i have a misfire in cylinders 1,3,5,6. After getting a tune up it still shows a misfire in cylinders 3,5,6. i have an 02 VW passat v6. Their coil pack is different and is connected by one coil piece instead of 3. Maybe the mechanic gave me a defective one but i doubt its the coil pack. The misfiring varies from beginning of ignition and then would stop after the rpms dropped. Sometimes it would ignite perfectly fine and in the middle of the drive it would misfire again. When the engine is misfiring and im on idle on a light it would jolt the car a bit and then the misfire would stop, or if it would jolt a little or not hard enough the engine would keep misfiring. I read somewhere that this model passat has had issues with the vacuum but what else could cause this misfire. Possible fuel injector problem? I would like to narrow the possibilities to a few instead of changing many different parts hoping that the car would be fixed.
