First a misfire, then three catalytics converters, then plugs, coils and o2's - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 13 (permalink) Old 03-03-2017, 01:14 AM Thread Starter
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First a misfire, then three catalytics converters, then plugs, coils and o2's

I have a 2009 Chevy Traverse LTZ with approximately 215,000 km on it. About six months ago I had a misfire, and I went to the shop within 30 minutes of it acting up and had a coil and plug replaced in the cylinder (5). The vehicle drove fine after that, then in December 2016, I was driving on the highway when this loud sound came out, and I could barely drive over 10km per hour. I was able to baby it to a mechanic where they told me my two Catalytic converters were out (right side and rear) both were replaced and in the weeks to come continued issues happened. I was blowing codes like crazy and replaced all coils and plugs, and then things seemed ok for about two weeks. I drove to Florida to vacation with family, and the vehicle came up with more codes I took it in and had to replace the third catalytic converter this one on the left by the radiator. Then I was fine for a week or so, and the light came back on I went in, and it was saying P0420 and that the catalytic converter on the right was bad so I had it replaced (again) and had all O2 sensors replaced at the same time. For about a week everything came up fine. Two days ago the codes came back P0420 and P2097. The mechanic suggested I order a computer, so I found one, and it will be installed tomorrow. I am at my wits end with this vehicle it's been over $6,000.00 in two months and just a seemingly never ending issue. Has anyone dealt with this and if so how did you fix it? This vehicle has been great up until this. Any help would be greatly appreciated. -Whitney
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post #2 of 13 (permalink) Old 03-03-2017, 10:44 AM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

133,594 Miles--- on your vehicle.

How about Carbon cleaning?
Also- any injector cleaning?

It sounds like its dumping fuel into the cats.



2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 60,000
2010 Traverse 3.6L- 127,000
2003 Trailblazer 4.2L- 180,000
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post #3 of 13 (permalink) Old 03-03-2017, 11:12 AM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Ditto. I was just looking at my service records and saw that my mechanic performed a Motor Vac Carbon Clean at 114,000 miles. I now have 190,000 miles and it has performed excellent in the past two years now. A little preventive maintenance goes a long way, I will be doing the carbon clean again in the next few months.
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post #4 of 13 (permalink) Old 03-03-2017, 12:52 PM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Agree with rbarrios (it should throw a specific code) but it sounds like you might have a stuck/sticky injector. Have you noticed a decreased MPG and possibly smell raw fuel at the exhaust when it was running OK? P2097 could be a rich OR lean condition...rich being a stuck or leaky fuel injector and lean being clogged injector. When you say "blowing thru codes like crazy" did you record them?

There is a TSB about the wiring harness to the injectors that could cause misfires and kill the cats, Ill have to research it but they are #'s 165586 & 193908 or PIP #'s PIP4736A & PIP5232C but I thought both of these TSB's involved different CEL codes.
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post #5 of 13 (permalink) Old 03-04-2017, 10:47 PM Thread Starter
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Hi Guys,

Thank you for your replies. I have not considered a carbon cleaning, and no mechanic has yet instructed that, but I will certainly bring it up to them. Today I went to pick it up after they installed a used computer. It was faulty and the vehicle ran worse than before so i just brought it right back to the mechanics and they are going to order another computer. I will bring up the carbon cleaning while it is still there. Thanks again.

Whitney
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post #6 of 13 (permalink) Old 03-15-2017, 01:51 PM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Ever replaced the oxygen sensors?

2011 2LT FWD replaced by 2017 2LT AWD
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post #7 of 13 (permalink) Old 03-16-2017, 07:26 AM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Quote:
Originally Posted by wriley
I have a 2009 Chevy Traverse LT with close to 200,000 miles on it. The engine light is on giving codes like P0300, P0306, P0406 and others. The car will not accelerate over 30-40 mph. Prior codes were P2098, P0301, P0300, P0302, P2098, P0300, P0301, P0302, P0496. A mechanic replaced the ignition coils (1 and 2). Afterward, the check engine light went out and the car drove smooth. However, within an hour and a half of driving the car, the engine light came back on. That was about a month ago. Recently, I have tried to put STP fuel injector fluid and fuel cleaner in the gas tank, but have not been able to accelerate the car to even get these fluids working.

At least two mechanics told me I needed the catalytic converter (one closest to the radiator) replaced and yet two different mechanics said I did not need a catalytic converter. I am having the car towed to Ralph's Mufflers to check it out on tomorrow. I am not sure what to do.

Any suggestions or know what the problem might be considering the current codes and past codes on the car? I will suggest that the mechanic try carbon cleaning.

I appreciate any feedback. Thank you.

P.s. I read Whitney's situation which I want to avoid putting a converter in if that's not the "source" of the car's problem.
Not being able to accelerate can possibly be a clogged catalytic converter, throttle body malfunction or restricted mode from something else. If needed they can put an air pressure gauge in where the oxygen sensors go to see if there's a restriction. I'm not sure if a muffler shop has the training to test much more, as in scanning the downstream oxygen sensors to check the converters operation. Also, an exhaust leak near a sensor can skew it's readings so that needs to be right.

The code P0496 pertains to the purge valve which pulls fuel vapors from the tank to be burned. With that code it means that it can't shut off the flow. A new purge valve usually fixes this and is a common problem. When this is open it causes a vacuum leak at the wrong time and the engine won't run smoothly. If it's really bad it can set other codes pertaining to misfires and fuel trim. So this needs checked and replaced then fuel trims monitored under varying conditions.

I'm hoping you have a nice set of AC Delco spark plugs installed and a dexos approved oil and top filter.

2012 Traverse LT2
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post #8 of 13 (permalink) Old 03-16-2017, 05:45 PM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

Quote:
Originally Posted by wriley
Hi whipster,

Ralph's Muffler told me a needed three catalyatic converters and a flex pipe ($1381.53 for parts/labor/tax). I will look into what you suggested to consider (i.e. spark plugs, sensor). I am checking partsgeeks.com for more reasonably priced parts. Any other suggestions to check into where to find the converters.

Thanks.
Rockauto.com can give you good deals. Make sure you know if it's California smog equipped. There's usually a white sticker under the hood that has the emissions info, if it says california equipped then order
for that, they have tighter specs.

2012 Traverse LT2
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post #9 of 13 (permalink) Old 03-16-2017, 11:48 PM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

If you are going to use rockauto do yourself a favor and google "rockauto coupon". Usually you can find a 5% off coupon which sometimes is enough savings to offset shipping costs.

'12 - Silver Ice Metallic - LT1 - FWD
K & N Air Filter - Magnaflow XL Turbo
LTZ "Dual" Exhaust & Bumper Cover (in the works)
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post #10 of 13 (permalink) Old 03-17-2017, 11:21 AM
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Re: First a misfire, then three catalytics converters, then plugs, coils and o2's

if im not mistaken-- rockauto just posted their 5% coupon on a thread on here yesterday.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 60,000
2010 Traverse 3.6L- 127,000
2003 Trailblazer 4.2L- 180,000
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