Question about 2004 BMW 745Li

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How to remove ecm from 04 bmw 745li

No fire being sent to first two injectors on either side of engine causing awful mis fire,ive replaced all coils and plugs..had test ran on car and everything is leading back to ecm failure

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Posted on Jan 02, 2017

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chiquititas
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SOURCE: how to replce front wheel bearing bmw 745li 2004

Why won't you replace it in the mechanic or dealer, its more safe, no?

Posted on Jun 17, 2008

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SOURCE: obd code p1343 how do i fix it on a 2000 540i bmw

how to reset my 1997 bmw 540i?

Posted on Jan 03, 2009

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SOURCE: running problem plugs and leads

the longest lead goes 2 the furthest cylinder, as they get shorter move back towards the distributor!!! all the leads are different lenghts! check the plug lead on the coil at the shock mount as it gives problems!!

Posted on May 21, 2009

c1apton15
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SOURCE: need to know the cost of replacing or rebuilding a

about $4500

Posted on Jan 02, 2011

roniecon
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SOURCE: i have a bmw e36

the 5th wire is the coil lead

Posted on May 11, 2011

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Fault code 227, 228, 238, 239, 240, 241, 242, 243 on BMW e46 320 ci (04/2001). All lambdas, coils, spark plugs and crankshaft position sensor changed recently. Thanks


codes 238-243 are mis-fires in each of the six cylinders. You know that because you have been changing parts trying to correct the spark. But this is just the symptom. Codes 227 and 228 are the fuel system fault in bank one and two. This is the real problem and causes the other codes. Its not getting enough fuel. Try changing the fuel filter with the fuel pressure regulator.

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Engine cylinder numbering


problem is that what auto zone told you was not complete
misfiring is more from faulty injectors/ injector control/wiring than from plugs and HT leads
so if you have replace the leads one for one then the problem will be the injectors

Jul 21, 2017 | Cars & Trucks

1 Answer

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.

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2003 TRACTOR 4X4 WAGON IS MIS FIRING ON CYLINDER TWO


Try to see if you can get view the are where the plugs are firing in the dark. Check for arcing off the plug or wires to the metal engine parts. I fought with a vehicle for days trying to determine a misfire problem on a car that we just put new plugs, wires, and coils on. Turns out the ceramic insulator on one of the BRAND NEW plugs had a hairline crack down the length of the insulator. You could not see if with the naked eye, but you could feel it if you ran your finger over it. Easiest to find if you can run the engine in a dark garage.

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P0430 code on bank 2 04 BMW 745li


It goes by the firing order of the engine .. Find which piston fires 2nd and that side of the engine is bank 2.

Feb 04, 2012 | BMW Cars & Trucks

1 Answer

Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

Nov 25, 2011 | 1994 Ford Mustang

2 Answers

OBD11 problem code p304-ive tried everything! please help!


  • P0304 is a detected misfire in cylender 4 only.

  • First thing I would like you to check is your firing order. While one misfire can make the engine hesitate and run awful it is not likely to preven all together starting.

  • Here is your firing order, double check

11_7_2011_12_07_06_am.jpg

  • You said you changed the coil pace, wires and plugs not long ago and still get the code correct? Assuming the firing order is correct we will move on.


  • Swap fuel injectors from and cylinder with #4. Now reset the codes and see if the code remains a P0304 or weather it moves. If it moves to the cylinder you swapped the injector with the the injector is at fault. If not the the injector itself is not the problem.


  • A smell of rotten eggs out of the tail pipe can be the sign of a bad catalytic converter. a P0304 alone rarely means the converter could be at fault it could be as well as a faulty computer.
  • I might suggest to switch the wire from #4 with another cylinder just to make sure you did not get a faulty wire and I would pull the plug from #4 and make sure it is not fouled again.

  • After all of the things you tried and the injector sway I would suggest that you put a pressure gauge on that cylinder and see if you have decent pressure. You could have an undetected head gasket failure, worn valve. A leak down test may have to be performed if the pressure is low to find out where the leak is.


  • Hope this helps.

Nov 06, 2011 | 2002 Kia Sportage

2 Answers

Have a 3.5l dohc in a 2002 isuzu trooper, got car home and started checking engine to find that the 3 cyclinders on drivrs side are not firing, how ever they are getting spark. is there a sensor that...


Possible jumped timing belt causing that side of the engine to be far enough out of time not to run on those cylinders.Check power feed to all injectors to make sure though.With the key on engine off,all injectors should have 12 volts

Sep 06, 2011 | Isuzu Trooper Cars & Trucks

1 Answer

Hi, I was cruising on the Motorway yesterday, when out of the blue My 1999 Jaguar 4.0 V8 started a serious mis-fire. Up to this point there had been no mis-fire and the tick over was smooth. The...


If a whole side has failed, as much as I hate to say it, the ECM/PCM has failed. More specifically the "drivers" for the injectors and should also fire spark. Let me know if you need anything else.

May 18, 2011 | 2000 Jaguar S-Type

1 Answer

99 pontiac grand prix that is still mis firing even after we changed plugs and wires, not sure what to do now please help


Misfires can be caused by several things including all the parts you have already replaced as well as faulty ignition coils, faulty injectors, vacuum leaks and engine mechanical problems such as low compression.
With the proper equipment, injector operation can be verified by performing injector balance tests, where the operation of the injectors in the misfiring cylinders is compared to the other cylinders that are not misfiring.
Also, engine mechanical failures such as bad piston rings or leaking/burnt valves can be diagnosed with a simple compression test.
An easy (and very inexpensive ) way to verify ignition coil operation is to swap the coil from the misfiring cylinder(s) with the coil(s) from the cylinder(s) that is(are) not misfiring. Then clear the fault codes and drive the vehicle. If the same cylinders are still misfiring, the coil is not the problem. If the misfire moves to the cylinder that you swapped with - replace the coil.
Sometimes, injectors can also be tested this way, but on most GM V-6 or V-8 engines, this is not practical due to the labor involved in "swapping" injectors.

May 10, 2011 | 1999 Pontiac Grand Prix

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