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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-16-2014, 08:48 PM
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CALWATERBOY CALWATERBOY is offline
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IGNITION COIL TROUBLESHOOTIN' - Easy!

.

If this is how BMW ignition coils are constructed, most failures would be shorted coil due to insulation breakdown.

What say you?





E9x Bosche Ignition Coil:



Last edited by CALWATERBOY; 05-17-2014 at 10:11 AM.
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  #2  
Old 05-17-2014, 05:57 AM
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DSXMachina DSXMachina is offline
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Cal, notice that your top photo is of a conventional coil as used with a mechanical distributor, or very early electronic ignition. That is a two wire, dumb coil. The second photo is of a COP coil, coil on plug, like the ones we have. Notice it takes three wires. Find out why it has three wires and you are on your way to finding out where many failures occur. You must teach yourself my son.
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  #3  
Old 05-17-2014, 06:09 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by DSXMachina View Post
Cal, notice that your top photo is of a conventional coil as used with a mechanical distributor, or very early electronic ignition. That is a two wire, dumb coil. The second photo is of a COP coil, coil on plug, like the ones we have. Notice it takes three wires. Find out why it has three wires and you are on your way to finding out where many failures occur. You must teach yourself my son.

2 low voltage connections for current flow through the primary coil...one high voltage to complete the circuit through the spark plug / secondary coil....



Last edited by CALWATERBOY; 05-17-2014 at 06:18 AM.
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  #4  
Old 05-17-2014, 09:48 AM
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CALWATERBOY CALWATERBOY is offline
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.

Having read codes to verify misfires, the issue is usually coil pack related, sometimes spark plug, and very rarely wires. But, how would you know what to replace? Below are DIY troubleshooting procedures. Note on spark plugs: Do NOT use anti-seize on threads! BMW plugs have surfaces that don't require this and BMW specifically recommends against. Anti-sieze results in plugs over-torqued! Big trouble - plugs broken off in head possible - best to avoid that!

Coil troubleshooting procedure - might look real dangerous until realizing that shielding runs way down from the top:


[/URL]


R&R Nuts and Bolts:




Last edited by CALWATERBOY; 05-18-2014 at 10:39 PM.
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  #5  
Old 05-17-2014, 10:30 AM
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Saintor Saintor is offline
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50% of all my troubles were associated to the BOSCH company, whose products didn't last as expected including spark plugs and a 2 coils. I wouldn't be surprised if the 2 oxygen sensors were Bosch too but I am not sure.
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Old 05-17-2014, 10:34 AM
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DSXMachina DSXMachina is offline
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Quote:
Originally Posted by CALWATERBOY View Post
2 low voltage connections for current flow through the primary coil...one high voltage to complete the circuit through the spark plug / secondary coil....


No. The secondary is induced by the collapse of the primary. The third, and still undefined low current wire isn't needed for that. Continue wax on, wax off, wax on, wax off.
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  #7  
Old 05-17-2014, 10:38 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by DSXMachina View Post
No. The secondary is induced by the collapse of the primary. The third, and still undefined low current wire isn't needed for that. Continue wax on, wax off, wax on, wax off.

True, but one cannot have current flow without completing the circuit....??

This German guy, not even an EE, said it's all relative. Smart guy! Very grounded.

.

Last edited by CALWATERBOY; 05-17-2014 at 10:40 AM.
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  #8  
Old 05-17-2014, 12:21 PM
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galahad05 galahad05 is offline
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I thought it was a sense wire.
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  #9  
Old 05-17-2014, 12:41 PM
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CALWATERBOY CALWATERBOY is offline
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Originally Posted by galahad05 View Post
I thought it was a sense wire.

Easily, but low voltage? Resistor in there?

I'd o'thought the high voltage side would short before low, and be monitored. Thinner wire, many more turns; lotsa push. Maybe both coil grounds are connected.
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Ah. Confirmation pulse from primary, diode breakdown. Gotcha.

.

Last edited by CALWATERBOY; 05-17-2014 at 01:07 PM.
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  #10  
Old 05-17-2014, 03:02 PM
Miller335 Miller335 is offline
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Quote:
Originally Posted by Saintor View Post
50% of all my troubles were associated to the BOSCH company, whose products didn't last as expected including spark plugs and a 2 coils. I wouldn't be surprised if the 2 oxygen sensors were Bosch too but I am not sure.
I agree.
Over rated company.
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  #11  
Old 05-17-2014, 08:57 PM
sptt144 sptt144 is offline
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BAV Auto sells some upgraded coils for our cars. Anyone ever invest? Maybe buy a coil a month?
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  #12  
Old 05-17-2014, 09:19 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by sptt144 View Post
BAV Auto sells some upgraded coils for our cars. Anyone ever invest? Maybe buy a coil a month?

Guessing: Higher voltage for high & low RPM integrity?

Hey, what is the output of BMW coils?

I've read 35kV for N54, but that may not be accurate. Although, might be right for turbo charge, and certainly accounts for reduced plug life vs. N52, which might be 12kV. Anyone running an automotive o-scope? N55 may be exactly the same coil output.

.

Last edited by CALWATERBOY; 05-18-2014 at 01:41 AM.
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