Misfire Help - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 24 (permalink) Old 01-04-2017, 01:44 PM Thread Starter
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Misfire Help

Hi all, Need help for a 2009 LT1 traverse-I was getting a misfire in cylinder 3 so I changed coil and spark plug and the issue jumped to cylinder 4. So I replaced all coil packs and spark plugs in all cylinders and cleared the code. A week later I am now getting a misfire in cylinder 5.I am now losing my mind. Could this be a bad ecm or am I missing something trying to diag this issue. Any ideas would be appreciated thanks
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post #2 of 24 (permalink) Old 01-04-2017, 04:32 PM
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Re: Misfire Help

It could be a few issues from dirty valves thanks to the direct injection fuel system to timing chain stretch (09's are well known for the timing issue).

Good info on the dirty valves here: http://www.traverseforum.com/index.php?topic=11089.0

As a side note: Do you have an account on www.my.chevrolet.com/myvehicle? If not, you should create one and see what open warranty items are open for your vehicle. On the left side there is a tab for Maintenance, and then choose Warranty Tracker. If you're not the original owner this should give you some indication if any of the recent Special Coverage warranties have been done (I think).
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post #3 of 24 (permalink) Old 01-04-2017, 05:02 PM Thread Starter
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Re: Misfire Help

Thanks for the info I had the timing chains replaced due to stretching in 2011.I have been adding techron every oil change. So I am at a loss with this issue
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post #4 of 24 (permalink) Old 01-04-2017, 05:47 PM
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Re: Misfire Help

Quote:
Originally Posted by ff151
Hi all, Need help for a 2009 LT1 traverse-I was getting a misfire in cylinder 3 so I changed coil and spark plug and the issue jumped to cylinder 4. So I replaced all coil packs and spark plugs in all cylinders and cleared the code. A week later I am now getting a misfire in cylinder 5.I am now losing my mind. Could this be a bad ecm or am I missing something trying to diag this issue. Any ideas would be appreciated thanks
What type of spark plugs did you use? On my 2009, GM put double platinum spark plugs in from the factory (probably to save some money over iridiums; gotta love those GM cost accountants). I had a strange misfire under load. I changed all coils out, and all spark plugs to iridium (which GM actually specified in the owners manual) and the misfire went away. I had the same type of problem on my 2004 Ford Mustang with misfires under slight load; changing out to iridiums did the trick.

Double platinum tipped spark plugs have a higher resistance than iridium ones; I'd try iridium spark plugs if you haven't already. If the valves are really, really dirty maybe have the dealer or another shop clean the intake.
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post #5 of 24 (permalink) Old 01-04-2017, 08:34 PM Thread Starter
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Re: Misfire Help

I replaced with all bosch coils and iridium spark plugs in all the cylinders. I guess De-carbonation would be next. I was hoping the techron would have kept the cylinders and pistons clean but maybe it is really gummed up
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post #6 of 24 (permalink) Old 01-05-2017, 08:35 AM
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Re: Misfire Help

You're on the right track and adding the Techron keeps the fueling system clean...the issue is the back side of the intake valves in a direct injection system never see the fuel spray which on normal injection motors keeps the valves cleaner. So buildup can happen and keep the valves from seating completely. There is a fairly new product on the market from CRC called Intake Valve Cleaner that is directed for DIY'ers to do this service. Member Quantum tried it in the following link with mixed result but he wasn't really having an issue before hand. You may have better luck or schedule to have a top end cleaning done as suggested.

http://www.traverseforum.com/index.php?topic=17961.0
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post #7 of 24 (permalink) Old 01-05-2017, 09:48 AM
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Re: Misfire Help

I had the dealer do the BG fuel system clean when the plugs were done at 97,000 miles. The vehicle definitely runs much better, but it's tough to say how much the fuel system cleaning factors into this. We've used low octane tier one fuel since day one, add a can of BG44K once a year, and I clean the throttle body/intake tube/PCV/MAF every oil change. Thus far, we've had no issues.

2010 Traverse LTZ AWD<br />Born 11/09<br />Silver Ice Metallic, Titanium Leather<br />DVD, Nav, Sunroof, Towing<br /><br />Just drive it.
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post #8 of 24 (permalink) Old 01-05-2017, 09:55 AM Thread Starter
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Re: Misfire Help

thank you all! this forum is great!
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post #9 of 24 (permalink) Old 01-05-2017, 10:08 AM
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Re: Misfire Help

on the highway- my CEL flashed for about 3 seconds.. maybe 6 flashes... (not solidly lit). Not even enough time to make a lane change.
I felt a bit of a stumble.

It did not set the CEL.

So far so good at 3500 miles into the trip----then flashing cel... then continued for another 200 miles to complete a 3700 mile trip.


When scanned- it showed P0089 and P0305 pending codes

52 misfires were shown on cyl 5.

1 day later and P0089 is gone.
no more misfires either.

Ill keep my eye on it.
But could be carbon buildup--- as I now have 122,xxx.
or- an issue with the injector on #5. (based on another thread on here from a member who got P0089 and P0305 and some other codes--were an injector change corrected the problem).
MPGs on the trip were excellent- and just that 3 sec blip....




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 #10 of 24 (permalink) Old 01-05-2017, 10:21 AM
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Re: Misfire Help

The fact that the CEL flashed means it detected a misfire as you stated and found through the OBDII codes; the problem with driving it is that you can ruin your catalytic converter. I had an issue with a misfire condition a few years back which showed the CEL, and it turns out the Bosch coil was bad so the dealer replaced it under warranty. I then had the misfire under light load with no CEL; replacing the coils and plugs fixed this. However, about a year later my left catalytic converter was toast and needed replacement.
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