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Missfire on cylinder 8 on bmw 545

Before missfire on all cylinders now after changing the sparkplugs and fuel filter only missfire on the 8th cylinder why??

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Move the ignition coil to another cylinder and see if the miss fire moves. If so replace that ignition coil. If the miss fire stays on that cylinder it is more likely the fuel injector. Was their carbon on the spark plugs when you removed them? This is indicative that the fuel injector is gummed up.

Posted on Jan 18, 2013

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Mis fire in 8th cylinder, just had coil replaced today with new spark plug drove from dealership home , engine light came back on


If this is still under the Warranty, back to the Dealer it goes. If you had to pay for an unneeded part, ask for compensation.
The sparkplug and coil get a signal to fire from the PCM. If the signal is not getting to the #8 coil/plug, then you need to move upstream to the PCM. Something may be corroded in the connector for that single cylinder.
The other test is the Noid test for injector firing. You might want to throw a new injector into the #8 spot and see if it helps.
Finally, the rear cylinders,4 and 8, have been used to route exhaust gas to the EGR. This is an additional duty that may effect exhaust flow on that single cylinder.
You did not state the year of your vehicle. For a time, a part called a "Cam Phaser" on 4.6L and 5.4L V-8 engines would cause timing issues inside the motor. Each side of the motor is independently timed, so you can have an issue on only one side of the motor. Perhaps with cylinder 8, a combination of events is causing your problem and when both the EGR flow demands from cylinder 8 and improper timing from a bad "Cam Phaser" causes a misfire. The "Lean Code" which has not appeared is an average of all 4 cylinders on one bank. Since you are not dumping "Raw, unburned fuel" from cylinder 8, we can assume that cylinder 8 is running lean and may not even be getting fuel.

Aug 16, 2013 | Lincoln Aviator Cars & Trucks

1 Answer

Missfire cylinder 8 545


Move the ignition coil to another cylinder and see if the problem moves. If it does it is the ignition coil replace it otherwise it is probably the fuel injector.

Jan 18, 2013 | BMW Cars & Trucks

1 Answer

Engine light came on and said 8th cylinder misfire i changed spark plugs and ignition coil but still showing same problem


Could be a clogged fuel injector. Check all ignition connections to make sure they are clean and secure as well as the one for the associated fuel injector.

Jun 11, 2012 | 2003 Ford Crown Victoria

1 Answer

96 acura tl 2.5 rough idle after warm up with rpm swings ignition and fuel pressure good sparkplugs black and new codes; primary o2 heater circuit bad missfire cyl.5 random missfire


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.

Jul 21, 2011 | 1996 Acura TL Series

1 Answer

How do I change the fuel filter on a 2000 Mercury Mountianeer?


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For the 6 cylinder 4.0 Liter EFI (electronic fuel injection) SOHC (single overhead cam) engine
(8th digit of VIN = "E"), and
the 8 cylinder 5.0Liter EFI engine (8th digit og VIN="P"):

1. relieve fuel system pressure
2. remove/disconnect:
NEG. battery cable
bolts holding fuel filter shield
fuel lines (3 of them) - labeled (1) in above diagram
fuel filter (labeled (2) in above diagram - from its support

Installation is the reverse of removal, but torque the fuel filter shield bolts to 15 ft-lb. (20 Nm).
And, if you're as careful as I am, apply anti-sieze to the bolt threads before they go in.

Oct 27, 2010 | 2000 Mercury Mountaineer

1 Answer

Missfire on cylinder n 2 p0302/po316


MISFIRE ON CYLINDER 2 COULD BE LEAKING INTAKE AT CYLINDER 2 OR DIRTY CLOGGED FUEL INJECTOR AT 2 CYLINDER.REPLACE AIR FILTER IF IT LOOKS DIRTY AND CLOGGED UP AND CHECK TRANSMISSION FLUID LEVEL.IF FLUID LOOKS BURNT SMELLY CHANGE FLUID AND FILTER.

May 17, 2010 | 2003 Ford Taurus

1 Answer

How do you change spark plugs on a 2004 bmw 545


You need to remove the top cover 1st. Then remove the gray trim covers on the left and right banks by pulling straight up.You will find individual coils in each cylinder. Disconnect the connector of the coil and pull the coil straight up.The plugs are under each coil.

May 11, 2010 | 2004 BMW 5 Series

1 Answer

1999 cadillac escalade missfiring cylinder #6


do you have a seperate coil for each spark plug check ur coil for number 6 or fuel injector

Feb 05, 2010 | 1999 Cadillac Escalade

1 Answer

Missfire


I would repalce the fuel filter, air filter and the sparkplugs. Check the boots at the plugs for holes burned through by the spark plug high voltage. It would be helpful to know the mileage of this vehicle.

Oct 23, 2009 | 1997 Ford Crown Victoria

1 Answer

Cylinder 5 missfire 1999 tahoe


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.

Jan 07, 2009 | 2004 Chevrolet Tahoe

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