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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-20-2016, 09:40 AM
splnters splnters is offline
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E39 525i P1343 Misfire Cylinder 1 With Fuel Cut-off

Hi I have had a very rough idle and misfire with fuel cut-off CYL 1 for a couple of weeks now.

I have done the following; changed ICV Idle control valve, cleaned maff (no code showing now). Checked for air leaks on air intake to throttle body (all good).
Today I have changed the plug on CYL 1 and swapped the coil pack over, cleared the codes hoping to resolve but P01343 recurs together with the rough idle.

Could someone please tell me what the readings on the coil pack connectors should be with ignition on? I have measured them previously and Cyl 1 is slightly below 5.v I think from memory about 4.3 - 4.7 I am now wondering if there may be a wire broken in the cable to the coil pack connector, as I am running out of ideas.

The only other code it is showing is P1609 which I believe is the temp sensor in the thermostat housing, but that would not cause a misfire.

Thanks for any assistance or advice

Dave
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  #2  
Old 12-20-2016, 10:00 AM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
Pin 1 of all injectors is fed 12V from the injector relay. Pin 2 is switched to ground through a series resistor by a transistor in the engine control module. Don't know what the voltage on pin 2 is with the engine stopped.

There is a device called a "noid light," which plugs into the injector connector. It allows for observing the signal at the injector. Read the instructions on the Matco box in the first post.

http://www.ebay.com/sch/i.html?_nkw=...&ul_noapp=true

P1609 Serial Communicating Link EML
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Last edited by edjack; 12-20-2016 at 10:14 AM.
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  #3  
Old 12-21-2016, 07:56 AM
splnters splnters is offline
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Hi here is an update of things tried today,
Spark confirmed Cyl 1, Cyl 1 injector swapped for Cyl 2 same resulting code, P1343 misfire Cyl 1 with fuel cut off, idles better now but can hear and feel it missing. I really now have run out of ideas.

Dave
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  #4  
Old 12-21-2016, 09:51 AM
MKJS MKJS is offline
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Dave, graph the pre-cat 02 sensor and do some reading here in the search box, there have been a couple of mysterious misses (but don't remember fuel cut-off) and if memory serves, some were fixed by either o2 sensor or a new cat. What that has to do with cyl 1 misfire I have no idea but there seems to be some correlation. Another thing would be a leak down test to ensure it's not a dead cylinder.

Jim
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  #5  
Old 12-21-2016, 10:11 AM
edjack edjack is offline
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Quote:
Originally Posted by splnters View Post
Hi here is an update of things tried today,
Spark confirmed Cyl 1, Cyl 1 injector swapped for Cyl 2 same resulting code, P1343 misfire Cyl 1 with fuel cut off, idles better now but can hear and feel it missing. I really now have run out of ideas.

Dave
Have you tried using a noid light? That will confirm/refute an electrical problem.
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  #6  
Old 12-21-2016, 11:15 AM
splnters splnters is offline
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Hi Guys,
thanks for your suggestions will continue to track this down tomorrow and let you know results.
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  #7  
Old 12-21-2016, 11:42 AM
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Brandon002 Brandon002 is offline
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Do a compression test. Cylinders in M54 engines are known to lose compression from stuck rings. If you have low compression do an AC Delco Piston Soak.
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  #8  
Old 12-21-2016, 12:15 PM
splnters splnters is offline
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Hi, thanks for that, could you possibly explain how I do that, and would Wynns injector cleaner do the same job??
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  #9  
Old 12-21-2016, 12:18 PM
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Brandon002 Brandon002 is offline
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Google "m54 Delco Piston Soak"

No, injector cleaner won't work. The AC Delco stuff is an upper cylinder cleaner. So it's made to dissolve carbon.
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  #10  
Old 12-22-2016, 08:20 AM
FLTech FLTech is offline
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Quote:
Originally Posted by splnters View Post
Hi I have had a very rough idle and misfire with fuel cut-off CYL 1 for a couple of weeks now.

I have done the following; changed ICV Idle control valve, cleaned maff (no code showing now). Checked for air leaks on air intake to throttle body (all good).
Today I have changed the plug on CYL 1 and swapped the coil pack over, cleared the codes hoping to resolve but P01343 recurs together with the rough idle.

Could someone please tell me what the readings on the coil pack connectors should be with ignition on? I have measured them previously and Cyl 1 is slightly below 5.v I think from memory about 4.3 - 4.7 I am now wondering if there may be a wire broken in the cable to the coil pack connector, as I am running out of ideas.

The only other code it is showing is P1609 which I believe is the temp sensor in the thermostat housing, but that would not cause a misfire.

Thanks for any assistance or advice

Dave
I had similar misfires on my 2002 530i recently. It started on one cylinder and then more. I was ready to call the junk yard and give the car to them. Then I noticed oil down in the spark plug wells. It was screwing up the spark plug firing. I cleaned the oil out of all of the spark plug wells and then all misfires stopped. Apparently the valve cover gasket needs replaced. I will get around to it soon.
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  #11  
Old 12-22-2016, 08:37 AM
splnters splnters is offline
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@FLTech

Hi Thanks for that I have had the plugs out all dry down the hole, I have confirmed the spark so coil and plug are ok and I have swapped injectors. I have also removed the plug and turned it over without the plug in place, can smell petrol coming into the cylinder, I have disconnected the 02 sensors, the plugs on top of the fuel rail, put it all back checked the voltage at both the coil pack and at the injector for Cyl1 all seem to be ok, I am thinking maybe a blockage from something in the air intake manifold or gummed up rings, I have a compression tester coming tomorrow, so that may reveal something. I have not fired the injectors out of their sockets yet I might check that tomorrow too, but I thought if I swapped them round, which I did the problem wold move but it hasn't. its done 129k and does not appear to have been maintained very well. Coil packs are still original.
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  #12  
Old 12-22-2016, 04:55 PM
splnters splnters is offline
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Finally found the fault

Hi, after much diagnostics today I discovered the injector on Cyl 1 was not giving the correct Ohms reading, followed the wire back to the ECU which supplies interrupt signals to the injectors and found two pins water damaged and missing, two other pins were weak and about to break. tomorrow I am going to bypass the pins, and rewire them by soldering directly to the ecu internally. I have no idea how these pins corroded ( as the ecu is well protected, so I am guessing condensation. Thanks so much for all the advice, I did a pressure check on all cylinters to rule out faulty valve springs and stuck rings, all cylinders were around the 210 bar mark.
I suggest anyone else with misfires or rough idle should check their ECU.s (it might save a lot of time and money replacing unnecessary parts.
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  #13  
Old 12-22-2016, 06:12 PM
MKJS MKJS is offline
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Awesome job!!!! Really nice diagnostic work.

Jim
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  #14  
Old 12-22-2016, 06:37 PM
dkotanto dkotanto is offline
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Great job! Any suggestions on what we could all do to prevent that of happening?


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  #15  
Old 12-25-2016, 06:13 AM
poolman poolman is offline
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This is caused by wicking coolant back through the wiring from the thermostat to the ECU. Have read about it before. Good catch on this. The wiring you have restored, is going to the injectors, is that correct?
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  #16  
Old 12-25-2016, 06:48 AM
splnters splnters is offline
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Yes correct injectors trigger supply lines

Dave
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