I replaced everything it says to also the fuel injector wich fixed it for a couple of months then it popped again checked for vac leaks couldnt find any so i reset the code and the car runs fine for a bit then code pops and car runs like **** again i dont get it
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Re: missfire # 4 cyl code
Are you still using the original fuel filter since the car was new?
replace it and see if that helps.
does this engine have one ignition coil for the engine or does it have one for each cylinder? if #4 is bad replace that one. good luck
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Fuel in the injector harness can result in a short causing this code. The only way for fuel to be there is a leaky injector. Dry off harness and monitor. Even though the injector is new, it may be defective. The next place to look is the wiring harness itself. You will have to find where the wiring for #4 injector goes into the vehicles computer and perform a resistance test from the injector harness to the computer to make sure there is no high resistance/opens. If all checks out fine, the computer may be bad. VW computer failure rates are extremely low. I would concentrate on a wiring issue.
could have bad plug wire.fuel injector number 3 wires at connector could have short or open.PCM not firing fuel injector 3 could have intake manifold leak at cylinder 3 could mechanical failure at cylinder 3.
Sounds like something in fuel system is clogged form running to low on fuel if vehicle is old and fuel filter has not been replaced for a long time. It does not take much but a small particle to clog injector or it could be fuel pump is going out. You need to check fuel pressure and change filter and also you might have to get fuel system flushed and you might just have replace injector at worst. Hope this helps
REPLACE DISTRIBUTOR CAP AND ROTOR REPLACE SPARK PLUGS AND WIRES IF NOT BEEN CHANGED IN LONG PERIOD OF TIME.CHECK IGNITION TIMING.CHANGE AIR FILTER CLEAN FUEL INJECTORS.IF ENGINE STILL MISFIRE IGNITION COIL IS WEAK OR YOU HAVE LOW CYLINDER COMPRESSION.
Try running some fuel injector cleaner through your fuel tank. What you may have are a couple of plugged or missfiring fuel injectors. I would suggest checking all of your wiring to your injectors to insure good connection, replace your fuel filter and check for vacuum leaks.
An injector can pulse without spraying fuel. They can get plugged or get build up on the nozzle and squirt fuel instead of spraying or not spray at all.. Your fuel rail is common rail, so your fuel line should go through a pressure regulator and then to a rail that dispenses the fuel equally. I have heard of cases where kia replaced the fuel rail to solve this problem. All the injectors will get the same amount of fuel pressure with this system, so if you have injector pulse and no missfires on #2 and #4, i would suspect clogged injectors. You can have an injector flush performed, which is probably not a bad ideal any way, to see if you can clean them up, or just replace the bad injectors. You can also inspect them visually to see if there is any debris on the nozzles. I wouldn't recomend that to an inexperienced person. Fuel can be very dangerous. I have head of techs removing the injector from the rail and running the car and watching the injector spray the fuel. Not recommended at all. All it takes is one spark or hot surface. Do a fuel injection clean, or buy some BG brand 44k fuel treatment and put in the tank first, the fill it up with gas. You can remove the injector and soak it in injector cleaner also to help free it up. If any of these don't help, time to take it in...they are also experiencing ECU problems..
How is the pressure in the fuel rail? a low pressure will cause erratic firing of the injectors - the further down the rail u get usually the worse the problem. If the fuel filter was not changed regularly or if the vehicle stood for a while, dirty fuel/standing fuel at some time in the recent past, this **** will accumulate in tyhe injectors. To avoid spending a loada cash, swap a few injectors around and see if the problem moves with the injector.