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I have a 2006 Buick Lucerne 3800 engine. No spark on cyl 4.

Customer Question
I have a 2006...

I have a 2006 Buick Lucerne 3800 engine. No spark on cyl 4. I've replaced coil, spark plug, wires, injector, has good compression. Just no spark.

Mechanic's Assistant: Have you checked all the fuses? Do you have a wiring diagram?

I've checked fuses and seem fine.

Mechanic's Assistant: Are you fixing your Lucerne yourself? What have you tried so far?

I've replaced spark plugs, wires, ICM, still no luck

Submitted: 8 months ago.Category: Oldsmobile
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Answered in 7 minutes by:
9/16/2017
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago
roybelding
roybelding, ASE Certified Technician
Category: Oldsmobile
Satisfied Customers: 7,454
Experience: 35 years of retail operations on all vehicles
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hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

did you check for voltage to the coil connector??

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

did you replace the coil???

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

are you there???

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Customer reply replied 8 months ago
I'm here now
Customer reply replied 8 months ago
I replaced the coil as well as the ICM module
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, it still lacks spark to number 4

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Customer reply replied 8 months ago
There is spark but it's too weak. At idle it misfires.
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

if you remove the wire from the coil for number 4 cylinder, does spark arc down the side of the coil

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

while the engine is running

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Customer reply replied 8 months ago
Faintly
Customer reply replied 8 months ago
Doesn't necessarily arc, I can plug a spark plug on the wire and see spark but it's very faint. Not as strong as other cylinders
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, then it is producing spark.

have you checked the wire to the plug???

Roy

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Customer reply replied 8 months ago
replaced them with new wires
Customer reply replied 8 months ago
have tried multiple wires, coils, ICM modules and just can't get good spark off of cylinder 4
Customer reply replied 8 months ago
At times it does not spark at all, sometimes it faintly sparks
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, let me check

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Customer reply replied 8 months ago
Weird problem, have not run into this before
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

is the connector to the icm in good shape. no damaged or bent pins??

Roy

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Customer reply replied 8 months ago
I've actually replaced it as well. Went to salvage yard and got another connector with another ICM module. The original conector had a pin that was darker than the others. Not sure if it was a little corrosion or burn
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, good.

the only other thing I can think of is the trigger for the crank sensor.

check the trigger wheel that the crank sensor runs across. if it is damaged or oil soaked it can effect the signal to the icm for the command to fire number 4

Roy

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Customer reply replied 8 months ago
Do you have a picture of te trigger wheel ?
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

I will see but all you have to do is look at the harmonic balancer and the wheel is behind it

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Customer reply replied 8 months ago
Ok
Customer reply replied 8 months ago
I'll look tomorrow
Customer reply replied 8 months ago
Thanks
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

your welcome

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

Roy

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Customer reply replied 8 months ago
Roy, I removed harmonic balancer today to inspect ring wheel and it was fine. I also replaced crank position sensor since I was already there, still missfire on cyl 4. Any other ideas ?
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

is there spark on the other wire at that coil???

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

what brand coil and icm???

Roy

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Customer reply replied 8 months ago
Gm
Customer reply replied 8 months ago
They where removed from another vehicle. I have 3 different ones and all have the same symptoms
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

all used???

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Customer reply replied 8 months ago
Correct
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

you need to start with new pieces. get a new coil set and the icm and go from there.

Roy

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Customer reply replied 8 months ago
I seriously doubt 3 different ICMs and sets of coils would be bad and show the same symptom. I don't want to spend extra money on parts that I don't need. I would agree with you if they showed different symptoms, but to have the same symptoms with all 3 indicated to me that's not the problem, thoughts ?
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

I hear you. you still need to start with new parts not used.

Roy

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Customer reply replied 8 months ago
I'll order them tomorrow and try.
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

any update

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Customer reply replied 8 months ago
After replacing ICM, I unplugged cyl 4 wire from coil. It sparked and now car won’t start
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, you now have spark at number 4

are you sure the connector is good and tight?? all terminals clean and not damaged??

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Customer reply replied 8 months ago
I’ll check
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok

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Customer reply replied 8 months ago
Connectors look good. I have no spark whatsoever now
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok the only thing you touched is the module and coils. even though you have a new module, remove it and have it tested at a parts store. they do this for free.

Roy

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Customer reply replied 8 months ago
Does the module have a fuse / relay ?
Customer reply replied 8 months ago
I do have power there. I’m replacing crank sensor again. Maybe that’s the issue.
Customer reply replied 8 months ago
I put the old ICM back on and it won’t start. I have zero spark now
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok

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Customer reply replied 8 months ago
Replaced crank sensor, fired right up. I’m still having a misfire in cylinder 4. However, I do have spark now, on all cylinders.
Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

ok, then next thing I would do is check the compression

Roy

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Oldsmobile Mechanic: roybelding, ASE Certified Technician replied 8 months ago

Roy

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