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E36 M3 (1995-1999)

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  #1  
Old 11-04-2010, 04:09 PM
vega16 vega16 is offline
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fault code table 11 F0 need help :(

damn check engine light came on again im getting the F0 Misfire detected, Cyl #3. I replaced the spark plugs less than a week ago along with the O2 sensors. after hours of searching online i didnt find much that was helpful any 1 have any ideas? all advice is welcome!

thanks!
-Vega-
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  #2  
Old 11-07-2010, 01:12 PM
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fun2drive fun2drive is offline
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Possible you have a failing coil. Pretty common. Did you also replace the coil to plug boots? Those go back too. Question? Did you look at the top of the plug on #3? Did it have any white color discharge?
I am guessing you cannot yet feel this driving the car? Most failures like this will not show up at idle and only under load. There is no checking a coil because the tests don't measure the 2ndary coil which is the one that typically breaks down.
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  #3  
Old 11-07-2010, 05:54 PM
vega16 vega16 is offline
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thanks for advise looked at boot it didnt have white stuff but it had a little bit of some wierd looking goop stuff ima replace soon hope thats what it is!! thanks again! it should be ok to drive till then right?
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  #4  
Old 11-07-2010, 10:19 PM
Negritoamni Negritoamni is offline
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Try moving the coil to another cylinder....Clear the fault and run the engine, If your fault code changes you have a defective coil.
__________________

1998 M3 coupe (Silver)owned since 2010
2001 X5 4.4i w/Sports Package,owned since 2007
1979 {E21} 320i/6 m20 engine/ 5 speed ,owned since 1993
1986 528e Black on black (sold)owned 14years
1985 325e 4dr (sold) owned 2 years -hail damaged
1994 735i Black on black (sold)
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  #5  
Old 11-08-2010, 03:27 PM
vega16 vega16 is offline
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i tried moving the coil to diff cylinder didnt work!! could it be the injector? what else can i try?
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  #6  
Old 11-08-2010, 04:14 PM
Negritoamni Negritoamni is offline
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It seems you are down to a compression test, swap the coil boot to another cyl. , if all that is good , your looking at an injector problem...
Disconnect the #3 injector connector, with a 12V test light and the ign sw in the "on" position you should have power (bright lite is good/ weak light is a sign of a poor connection or high resistance in that circuit) at one of the contacts at the connector, the other contact is the controlling ground from the DME.
Measure the resistance between the two contacts on the injector, compare with another cylinder. If your readings are the same , measure one contact to the injector shell or body just to make sure the injector coil is not shorted to the shell.
If all ur readings are good you may still have a clogged/leaking injector, which if you may swap it around before buying one,
Good Luck
__________________

1998 M3 coupe (Silver)owned since 2010
2001 X5 4.4i w/Sports Package,owned since 2007
1979 {E21} 320i/6 m20 engine/ 5 speed ,owned since 1993
1986 528e Black on black (sold)owned 14years
1985 325e 4dr (sold) owned 2 years -hail damaged
1994 735i Black on black (sold)

Last edited by Negritoamni; 11-09-2010 at 07:58 PM. Reason: gramar
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  #7  
Old 11-09-2010, 12:31 PM
vega16 vega16 is offline
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Talking

WOW thanks for the info very helpful ima go ahead and try it tomoro cant today. hope it works!
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  #8  
Old 11-17-2010, 07:49 PM
vega16 vega16 is offline
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Unhappy

so i couldnt figure out how to do the test so i ended up buying another injector for the cyl. it worked for about a week and the damn light came on again F0 running out of ideas might have to take it to the mechanics! anything else i should try before i send her to the doctor? i feel like this... i have never taken her to anyone and i dont want to but i feel like i dont have a choice!!
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  #9  
Old 11-17-2010, 10:25 PM
Negritoamni Negritoamni is offline
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Well if you have replaced the #3 injector and it worked for about a week....Lets stop for a second and think.....What have we moved or tampered with? It worked when you installed the new injector, what did you move? the connector and wire harness...is the only thing that was moved and it worked for a week, yes?
Lets try this:
Remove the plastic injector cover so you can see the injector connectors.
With the engine running shake test the wire harness to the #3 cyl
Pay close attention to the engine idle, if there is any rough idle or missing while you are shaking the wires, your problem is in the harness or injector connector
Inspect the injector connector and its contacts for burnt or pushed back contacts
On the injector connector, pull back the rubber boot and slightly tug on each wire to make sure the wire is not broken or pushed back
Take a close look at the contacts in the connector, they are suppose to bite the mating end tightly, if this is too loose you will have high resistance in this circuit, thus the injector not operating correctly.
If you need to prove my theory, reseat the #3 connector clear your fault and see how long it take to get the fault back.

last check is the worst, ring out the engine harness...continuity check of the #3 injector wires to the DME. The purpose of this is to prove your harness is good or defective.
If you get to this point , I can give the info on which pins to check it from on the DME connector.
This can be done from the DME connector and you can compare it to the other cylinders for comparison.

Good Luck,
__________________

1998 M3 coupe (Silver)owned since 2010
2001 X5 4.4i w/Sports Package,owned since 2007
1979 {E21} 320i/6 m20 engine/ 5 speed ,owned since 1993
1986 528e Black on black (sold)owned 14years
1985 325e 4dr (sold) owned 2 years -hail damaged
1994 735i Black on black (sold)
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  #10  
Old 11-18-2010, 04:30 PM
vega16 vega16 is offline
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Location: oakland
 
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Mein Auto: E36 m3
Ok so i removed plastic cover to expose wires that connect to the connectors and did the shake test i didnt hear any change in the engine. I also inspected the connectors for burned or pushed back contacts and didnt see anything different with the other connectors.

I didnt find the rubber boot you were talking about but i did inspect the wires the connect to the connector i tugged and moved them around seemed good to me i also was not able to inspect the contacts to the connector (my dumass couldnt figure it out) i did reset the code and drove it around for a bit seemed fine it didnt shake at all so il be waiting for the light to come back on :\

also i didnt understand the last part ??"ring out engine harnass"?? check 3rd injector wire to ?DME?
whats DME?

THANK YOU for responding so fast i know u have better stuff to do than to be on here helping me with this. you are a life saver!

PS i have a 1998 E36 M3

Last edited by vega16; 11-18-2010 at 04:32 PM.
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  #11  
Old 11-19-2010, 02:03 AM
Negritoamni Negritoamni is offline
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Mein Auto: 1998 m3
"Ring out engine harness" is a term we use when checking a wire or wires for continuity and insulation integrity...A ohmmeter is normally used for this test.
DME is your engine computer...Keep in mind you will always have 12V at each injector with the ignition key in the on position. But the engine computer controls when the injector opens and for how long it will stay open.
If you are familiar with an Ohmeter, this will test the continuity or resistance of each wire tested...
I still believe you have a wire problem, due to that it goes away when the injector connector is reseated,
you did say the fault has not come back yet,...Take a chance get a can of electrical contact cleaner and spray those contacts on the injectors, and run it til the light comes on.

lets me know how it turns out
__________________

1998 M3 coupe (Silver)owned since 2010
2001 X5 4.4i w/Sports Package,owned since 2007
1979 {E21} 320i/6 m20 engine/ 5 speed ,owned since 1993
1986 528e Black on black (sold)owned 14years
1985 325e 4dr (sold) owned 2 years -hail damaged
1994 735i Black on black (sold)
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  #12  
Old 11-22-2010, 12:39 PM
vega16 vega16 is offline
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Location: oakland
 
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Mein Auto: E36 m3
ahh so the day after i reset the code it came back so ima get that cleaner stuff you were talking about il let u know how it goes
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