Changing coils on 2009 - GMC Acadia Forum: AcadiaForum.net
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post #1 of 39 (permalink) Old 03-25-2013, 08:43 AM Thread Starter
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Changing coils on 2009

Hello-

I've read a few of the threads here regarding bad coils, especially on cylinder #5. Several weeks ago my 2009 was starting to misfire. I took it to the dealer and they changed coil #4. The Acadia has about 75K miles. Last week, it began skipping again and the CEL came on. I took out my handheld and determined I had a misfire on cylinder #5. Not wanting to face another couple hundred dollar bill, I decided to do this one myself. Since #4 had a new coil, it was easy to identify which cylinder was #4. What I didn't know, was which way to go to get #5. As luck would have it, I got #1 and the problem still existed. Anyway, I put the coil I took out of #1 into #5 and the problem went away.

My question is; How many more of these can I expect to change? Is it a chronic problem?

Thanks for your help!
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post #2 of 39 (permalink) Old 03-25-2013, 09:06 AM
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Re: Changing coils on 2009

This seems to be a nagging issue for the 09; coincidental that this was the first year for the DI engine. I wouldn't expect anymore than 1 but you are getting ready to change your second one. Hopefully this will be the last one that needs changing

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post #3 of 39 (permalink) Old 03-25-2013, 09:23 AM
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Re: Changing coils on 2009

I had one go bad around 36k, replaced under warranty. Next one is probably on me, as the 2009 has 49,300 miles and ticking. It would be nice to know the firing order, I believe it is 2-4-6 in the back left to right, and 1-3-5 in the front left to right.
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post #4 of 39 (permalink) Old 03-25-2013, 06:25 PM
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Re: Changing coils on 2009

From the FSM:
Quote:
The right bank of cylinders are number 1-3-5 and the left bank of cylinders are 2-4-6. The engine firing order is 1-2-3-4-5-6. Right hand (RH) and left hand (LH) designation through the engine mechanical section are viewed from the rear of the engine or from inside the vehicle.
So the front of the car would be 2-4-6 and the rear 1-3-5 from left to right.

The coils are 'supposed' to last 100k mi.
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post #5 of 39 (permalink) Old 03-25-2013, 07:34 PM
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Re: Changing coils on 2009

Just change them all. That's what I did along with the spark plugs. I kept the old ones, but have no idea how to test them. Amazon is your friend.
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post #6 of 39 (permalink) Old 03-25-2013, 08:16 PM
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Re: Changing coils on 2009

Quote:
Originally Posted by jcbecker28
Just change them all. That's what I did along with the spark plugs. I kept the old ones, but have no idea how to test them. Amazon is your friend.
According to the FSM, they only need replaced if the car pops a code for a misfire. It has you test the circuitry to the coil, then if that passes, you know the coil is faulty and should be replaced. See below.
Quote:
Circuit/System Testing

Note: Do not perform this diagnostic procedure if you were not sent here from a misfire DTC or the Engine Cranks but Does Not Run diagnostic.
•Ignition OFF, disconnect the harness connector of the ignition coil.
•Ignition ON, load test for battery voltage between the ignition voltage circuit terminal 2 and ground.
⇒If less than B+, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.
•Crank or start the engine. Test for 200-400 mV between the appropriate IC circuit terminal 1 and ground.
⇒If less than the specified value, test the IC circuit for a short to ground or an open/high resistance. If the circuit/connection tests normal, replace the ECM.
⇒If greater than the specified value, test the IC circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.
•Connect a test lamp between the each of the ground circuits terminal 3, and terminal 4, and B+. The test lamp should illuminate on each circuit.
⇒If the test lamp does not illuminate, test the suspected circuit for an open/high resistance.
•If all circuits/connections test normal, replace the ignition coil.

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post #7 of 39 (permalink) Old 03-26-2013, 07:26 AM
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Re: Changing coils on 2009

Just an FYI, when my coil went bad, the car did not store an engine misfire code. They had to do the resistance test that lamping.ap described to find it.
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post #8 of 39 (permalink) Old 04-02-2013, 11:19 AM
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Re: Changing coils on 2009

I just took my 2009 Acadia in this morning due to misfiring. Coil #2 was the issue. BTW, not covered under powertrain warranty. Not a "lubricated" part...

I'm expecting Ourisman Chevrolet-Buick-GMC in Alexandria, VA to screw up the repair somehow, as they always seem to do. GM should shut that dealership down for the shoddy repair work they do on their vehicles. I really like my Acadia, but it will probably be the last GM vehicle i buy if I have to deal with Ourisman...

Stan
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post #9 of 39 (permalink) Old 04-02-2013, 11:36 AM
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Re: Changing coils on 2009

Quote:
Originally Posted by stoney56
Just an FYI, when my coil went bad, the car did not store an engine misfire code. They had to do the resistance test that lamping.ap described to find it.
If your Acadia wasn't throwing codes, how did you know that you had a bad coil? I mean, what led you to even having them tested?
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post #10 of 39 (permalink) Old 04-02-2013, 12:03 PM
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Re: Changing coils on 2009

Quote:
Originally Posted by StanB
I just took my 2009 Acadia in this morning due to misfiring.&#160; Coil #2 was the issue.&#160; BTW, not covered under powertrain warranty.&#160; Not a "lubricated" part...&#160;

I'm expecting Ourisman Chevrolet-Buick-GMC in Alexandria, VA to screw up the repair somehow, as they always seem to do.&#160; &#160;GM should shut that dealership down for the shoddy repair work they do on their vehicles.&#160; I really like my Acadia, but it will probably be the last GM vehicle i buy if I have to deal with Ourisman...

Stan
They are very simple to change out. You should've tried to do it yourself.

Edit: I'm referring to Coil #2. #s 1, 3, 5 require you to remove the intake manifold per the FSM.

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