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Discussion Starter #1
Hello everyone, I have an 09 traverse that has been having acceleration problems over the past few weeks. It has 118,000 miles on it.

The issue is that when I hit about 60mph it starts to jerk and kind of lunge forward as if it was trying to catch the gear or something. Once I hit 70mph it stops. It did this a few times when I was going 30-40mphs but now it doesn’t do it. I know that there is a special coverage for the 3-5-R clutch wave plate that’s good until 10yrs/120,000 miles. I am just shy of that with less than a month left. Problem is I’m not sure if it’s that. I searched the forums but didn’t find anything specific to what I’m experiencing. Customer service said I should take it to the dealer to see. Over the phone, the dealer said only way is to take out the transmission and if it’s not covered by the warranty I’m liable for the labor costs!

I’m in a predicament and not sure what to do. Any ideas?

This thing has been nothing but problems with the rack & pinion being replaced twice and having the same symptoms again, now this.
 

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the warranty is applicable based on the IN SERVICE DATE.
your 2009 could be an early build- and may be past the 10 yr point.
 

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Agreed...bad plugs or coils can cause a misfire that causes shaking. Does not always set a code. If your have never been changed it is time. May fix the other issue.
 

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It is definitely the plugs and / or coils. I had the exact same symptoms and thought transmission issues at first. I then did a thorough google search and found the symptoms are more due to misfire. I changed out all 6 plugs and all 6 coil packs and the problem went away and drives like a dream now. I had 136k miles on a 2009 with original plugs. The ECM on these things is very good at keeping the engine running on "bad plugs" but eventually they need changing. There is no way to diagnose a bad coil, as that requires running the engine and pulling a coil and listening for misfire. It is best to just change them all since you have to pull off the intake manifold to reach them. ~$450 in plugs and coils and 4-6 hour job. Not difficult and no special tools needed. Look up on youtube for a video of a guy doing the job, there are a few. DO NOT assume this is a transmission problem. The dealer / transmission guys will happily bleed you dry chasing false tranny issues.
 

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Scuze my Egnertz, but, I have a problem with some of the answers on this thread. Can the new types of plugs & coils on these modern vehicles actually "heal" themselves, albeit temporally?



If I'm reading correctly, at certain speeds, all kinds of shake, rattle,& roll begins, speedup, things return to normal.....for awhile.


And the culprit(s) are the plugs/coils or both?


Regarding coil test. Are U sure there's not a test? My old 97 Plymouth Grand Voyager 3.3 has 3 coils, one for every 2 cylinders. There is a simple ohms test one can do on these coils to see if there any good.
 

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It isn’t an issue of ”healing” itself temporarily...

Rather it is a matter of the load put on the engine. Higher rpm, faster speeds, up hill, etc all require the engine to work harder. The plugs/coils that are weak might work on a small engine load, but increase the workload and here comes the misfire !!
 

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Don't wanna pic nits..



Probably some misfiring,albeit indistinguible, at all speeds "if" indeed it is the plugs/coils or both.


I've got a real problem, call it a fetish, about throwing new parts at a problem without first doing a little testing, and I didn't see any here.


How do U check a plug?( Rhetorical question).....You don't, just replace it. Coils are just transformers with a primary & secondary windings that can be tested.
 

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I agree that you don’t simply throw parts at a vehicle, but in this case, with over 100,000 miles on a 2009 vehicle, I’d sure spend a few dollars on parts the I would consider maintenance items.

Spark plugs at rock auto are 1.77 each or $11.00 for the set. Coils there are $16 each, or $96. So, for a tad over $100, the ignition system maintenance components are all new. Since the intake manifold has to come off the replace plugs, and also coils, it would be silly not to replace both at the same time.

If that doesn’t solve the issue, then in depth diagnostic would be needed. However, I’d bet this solves the problem.

Good luck
 

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Don't wanna pic nits..



Probably some misfiring,albeit indistinguible, at all speeds "if" indeed it is the plugs/coils or both.


I've got a real problem, call it a fetish, about throwing new parts at a problem without first doing a little testing, and I didn't see any here.


How do U check a plug?( Rhetorical question).....You don't, just replace it. Coils are just transformers with a primary & secondary windings that can be tested.
True that they can be tested to be good or defective on a bench. But you should also check them under real world conditions, heat, vibration, load, etc.
 

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Should have done a little more research before posting.


If I read chemensu's post right, he stated that plugs & coils were ~$450 for this vehicle. After checking O'REILLYS coils for this model run from $49 + tx. to $103 + tx. each........Or one can buy coils on Ebay by the 6 pack for $50 bucks with free shipping.....or, U can buy coils 1 at a time on Ebay for $13.00 with free shipping. Whatever floats yer boat. Didn't check on plugs, they're cheap.


Point? Forget any testing, just routine maintenance.
 

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Discussion Starter #14
Thanks all for the comments.

I ended up taking it to the dealer and sure enough there was a misfire on 3,4, and 6. They were able to replicate the issue that I was having. Price they quoted me was $1500 to replace all spark plugs and coils so I paid the diagnostic fee and took it to a mechanic for confirmation. Charged me $850.

Funny thing is that when I picked it up from the dealer, the check engine light was on and drove like sh*t. A lot worse than when I dropped it off. I assume that was from the testing they did?

Anyway, the traverse runs a whole lot better now.
 
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