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      08-29-2016, 05:33 PM   #1
Givol
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Recurrent coil failure with jb4 BCM

Has anyone had recurrent problems with blowing Coils with JB4 BCM. My set up is it MSR intake with JB4 BCM. I was having problems with engine drive train malfunction. I am replaced all the coils and regapped the spark plug. I have had two recurrent coil problems on different cylinders. Dealer has been gracious to replace them. They take the MSR intake off, put back the original intake and find the problem with the coil. I have taken off the JB4 BCM prior to visits to the dealer. They think the fault maybe the intakes but because they cannot link the electrical system to the intake they keep the car under warranty. I wonder what my next step is but I can't continue to use the JB 4/BCM. Could the problem be with injectors? Do I just need to get a tune?

Thanks for your help
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      08-29-2016, 07:33 PM   #2
Msizzle
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i don't see why jb4 would blow a coil, i would think the problem is elsewhere
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      08-29-2016, 07:42 PM   #3
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      08-29-2016, 07:52 PM   #4
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Quote:
Originally Posted by Givol
Has anyone had recurrent problems with blowing Coils with JB4 BCM. My set up is it MSR intake with JB4 BCM. I was having problems with engine drive train malfunction. I am replaced all the coils and regapped the spark plug. I have had two recurrent coil problems on different cylinders. Dealer has been gracious to replace them. They take the MSR intake off, put back the original intake and find the problem with the coil. I have taken off the JB4 BCM prior to visits to the dealer. They think the fault maybe the intakes but because they cannot link the electrical system to the intake they keep the car under warranty. I wonder what my next step is but I can't continue to use the JB 4/BCM. Could the problem be with injectors? Do I just need to get a tune?

Thanks for your help
What map are you using and what octane gas?

What codes are you throwing and what leads you to believe it's blowing an ignition coil? Is it the same coils?
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      08-29-2016, 08:00 PM   #5
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Is the problem reoccuring after you replaced all the coils and regapped plugs?

Seems unusual, flash and piggies can give this problem, if it persits after the adtion period a plug swop normally sorts.

Code and discription would be useful.

Note you could have underling HPFP, injector or injector fuel rail problems that occur when you make more fuel demands... have you looked at your fuel trim to see if it is maxed out and the AFR, if its week it can cause missfires.

Finally what has Terry said?
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      08-29-2016, 08:04 PM   #6
ur20v
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Is the problem reoccuring after you replaced all the coils and regapped plugs?

Seems unusual, flash and piggies can give this problem, if it persits after the adtion period a plug swop normally sorts.

Code and discription would be useful.

Note you could have underling HPFP, injector or injector fuel rail problems that occur when you make more fuel demands... have you looked at your fuel trim to see if it is maxed out and the AFR, if its week it can cause missfires.

As above... what map does this happen on, what age car and is it a CP car?

Finally what has Terry said?
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      08-29-2016, 10:03 PM   #7
Givol
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2013 non CP
Problems occurred only after BCM added. The engine light would reset after clear codes on the jb4 interface. Once I swapped all the coils and recegapped the spark plugs I would not be able to clear the fault even after taking off the JB4. That's when I would take it to the dealer.

93 octane
Map 1
Codes it is throwing is failed ignition on cylinder 7. 140010. 140710. It's always cylinder 7 That's why i changed the coils in the first place. The reason I believe it was the coils afterward- the dealer would move the coils and determine it failed i.e. Cylinder 6 misfired exchanged to cylinder 7 and 6 would work, but 7 misfired. Changed coil out all was well, until tried pulls with jb4 BCM, then I lost the coil for 7.
Terry said initially (prior to changing the gaps and coils) fuel trim issue and obd reading slow. He was super helpful but I got the feeling was something wrong in the car and not the jb4. That's why swapped coils and plugs.
Will re ask terry tomorrow
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      08-29-2016, 10:19 PM   #8
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What is your plug gap set to?
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      08-30-2016, 01:42 AM   #9
ur20v
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I think its your fueling and that the causes load on your ignition and failing the coils, this normally only happens on non-CP cars running map 2 though.

If you do a search on missfires on early cars 2012/2013 there was an issue with the injector rail and metal shavings causing missfires under load.

It looks like an underlying issue on your car and the tune is just exasperating it.
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      08-30-2016, 02:51 AM   #10
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Quote:
Originally Posted by Givol View Post
2013 non CP
Problems occurred only after BCM added. The engine light would reset after clear codes on the jb4 interface. Once I swapped all the coils and recegapped the spark plugs I would not be able to clear the fault even after taking off the JB4. That's when I would take it to the dealer.

93 octane
Map 1
Codes it is throwing is failed ignition on cylinder 7. 140010. 140710. It's always cylinder 7 That's why i changed the coils in the first place. The reason I believe it was the coils afterward- the dealer would move the coils and determine it failed i.e. Cylinder 6 misfired exchanged to cylinder 7 and 6 would work, but 7 misfired. Changed coil out all was well, until tried pulls with jb4 BCM, then I lost the coil for 7.
Terry said initially (prior to changing the gaps and coils) fuel trim issue and obd reading slow. He was super helpful but I got the feeling was something wrong in the car and not the jb4. That's why swapped coils and plugs.
Will re ask terry tomorrow
My opinion if your still getting codes for the same cylinder most likely it's an injector. Have they considering putting in new injectors? I would run it with jb4/bcm to cause a DTM and check it and see if it's same cylinder. Then take jb4/bcm out and make sure not to clear the codes otherwise they won't do anything unless they see the codes stored.

Good luck
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      08-31-2016, 10:09 PM   #11
Givol
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Thanks that's what I think it is the injector for cylinder 7. Good thing now is I have an engine light on and my code is for fuel mixture problem with the only mod is the msr intake. Dealer says must take off MSR because can't test properly. Will be my project for this week. They haven't considered the injector because when they replace the coil the code goes away.

The gap is 0.022 per your rec allmotor.

Thanks for everyone's advice. Hopefully the dealer will be cool because when my wife picked up my car she told them this all started when he put on that JB4...��
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      09-01-2016, 12:13 AM   #12
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Pluga not tight gap could be needed
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      09-08-2016, 05:15 PM   #13
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Where do you guys get plugs? Pm me part number or source please.
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