Ignition coils keeps blowing

Aly Diagnostician Congo Posted   Latest  
Resolved
Electrical
2005 Infiniti FX35 3.5L (VQ35DE) 5-spd (RE5R05A)
Engine Not Start

Hi, I have infinity fx35 2005 v6,we replace ecm because old one not sends signal to injectors​.​engine start for some minutes then same problem happen ,ecu stop sending injectors signal ,and 4 ignition coils blows. I hear that this is a common problem for these models!!.anybody face this problem before? Plz advice and help. Thanks

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Robert Diagnostician
New York
Robert
 

Hi Aly ive had this happen before. Voltage drop the. Engine ground. You will probably see a very large voltage loss on the ground side. Ive found the engine has a poor ground causing the coils to become triggered from induced Voltage caused when another coil collapses. This caused all 4 coils to fire every engine rotation! That caused them to overheat and fail. The fix was to install all new…

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Interesting
Aly Diagnostician
Congo
Aly
 

Hi Robert, I already add ground from battery to engine,but problem still same!maybe i need to check the small computer grounds. Thank you!

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Victor Owner/Technician
Florida
Victor
 

Nissan grounds normally run from battery to transmission housing​.​Therein lies the problem because aluminium has proven to be unsuitable for this purpose. I would suggest that a new ground be installed between the battery and starter bolt.

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Peter Diagnostician
Tennessee
Peter
 

i would begin by removing the coils and inspecting them for any melted areas, could be the first step since it continues to blow fuses before you delve into the wiring aspect of the vehicle I would inspect that first.

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Aly Diagnostician
Congo
Aly
 

Yes the coils have melted!

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Ray Diagnostician
Ontario
Ray
 

It wouldn't hurt to scope the cmp ckp sync and this capture is the same for your Infinity.

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Oscar Diagnostician
Virginia
Oscar
 

Replace ground cable, you have a bad ground most likely.

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Aly Diagnostician
Congo
Aly
 

We clean all grounds points and i add ground from engine to battery ground.

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Caleb Diagnostician
Indiana
Caleb
 

Aly, are you saying the #4 cylinder ignition coil blows up or you have 4 of the 6 ignition coils blowing at the same time??

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Richard Technician
New York
Richard
 

It does sound like a ground problem. I would replace the negative cable and make sure you have a clean ground at the battery, body and to the engine.

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Helpful
Aly Diagnostician
Congo
Aly
 

Ok tomorrow i will double check all ground points.

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Caleb Diagnostician
Indiana
Caleb
 

Do you have a scope Aly? I believe you have an Autel one I have seen you use in the past. Instead of “cleaning” grounds let's put that scope on a couple ground terminals at some of your coils that are blowing up. Then attach the ground leads of the scope leads to the negative battery post. Start the car an capture the waveform. Then post it here so we can check out the V drop if there is any.

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Greg Technician
Washington
Greg
   

Make sure the big ground on passengers side is there. I think there is a bracket Attached. I’ve added grounds and still melted coils Found that ground wedged underneath Something on fender. Was left off when v/c gaskets were down I think. I didn’t have any voltage drop on ground to coils. I can’t remember is 4 the middle on on passengers side that one was the one that would melt. Checked the…

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Manny Owner/Technician
California
Manny
 

Make sure alternator is not overcharging and killing your coils

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Ray Diagnostician
Ontario
Ray
 

The red channel shows a known good 4 cylinder engine block ground voltage drop to the negative battery clamp and it measures near 188mv while cranking. Also measure the cranking ground voltage drop on the transmission and on the starter case.

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Agree
Aly Diagnostician
Congo
Aly Resolution
 

Ecm was replaced,and engine ground cleaned

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