2008 2.7l Misfire. Oh No! - Hyundai Forums : Hyundai Forum
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#1 Old 06-25-2011, 03:07 PM
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PoMansAWD
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Have any of my fellow 2007+ 2.7 owners or master techs run into this?

2008 GLS AWD, 2.7L w/ 66500mi. This happened on my way home from work this AM. Vehicle cold started normally, but I noticed a stumble as I idled out of my parking spot after a 12hr shift. All gauge indications looked OK. A few hundred yards down the road (and deep in the hood no less) I can feel an intermittent vibration/stumble and now I get the *FLASHING* (misfire) check engine light.

5am Sat morning and I'm already on the highway for my ~35mi ride home. The vehicle behaved OK, but you could feel a definite power loss, indicative of not firing on all 6. I hated to, but I had to drive it the whole ~35miles with the flashing CEL. I couldn't smell rich exhaust, nor did I notice any black smoke, etc.

Now I'm SOL. I have no warranty since I'm a subsequent owner (3rd owner of vehicle). Of course I lent out my generic code reader 2yrs ago and never got it back.

My garage is currently upside down, tools packed away..etc. We just had a baby a few weeks ago and moved to a new house. Perfect timing.

Joel
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#2 Old 06-25-2011, 03:21 PM
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First thing I'd do is run the scan. P0300~P0306 on your vehicle ... 300 for 'you name it', 301 for Cyl 1, 302 for Cyl 2, etc. See if indeed that's what is showing up. There are a number of reasons for 'stumble' (including TPS) that will either be eliminated or discovered during the scan. Get your reader back or borrow one somewhere. While you might not have been smelling a rich mix, if it's happening due to a legit misfire, you don't want all of that raw gas moving through the cylinder - doesn't do anything good for lubrication.

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#3 Old 06-26-2011, 02:03 PM
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I picked up an Actron CP9550 OBDII/CAN reader. Got totally flogged on the price ($79) because I didn't want to wait days to mail order a ~$29 China special. They had a $49 reader on the shelf, but it didn't say it was CAN compatible.

Anyhoo... P0301 and 300 show up. Cyl #1 misfire and random/multiple misfire.

Lovely. #1 is tucked up so nicely under the intake manifold and I really don't feel like removing the intake to fiddle with coils only to not solve the problem. The intake would have to come off and put back on for every one of my troubleshooting attempts.

Now I need to decide if I want to use the trusted independent shop right around the corner from me or call the Hyundai dealer. Either will require a wait for an appt.

I'll tell ya.. things never happen at a good time. Resources are beyond low at the moment!

Joel
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#4 Old 06-26-2011, 03:22 PM
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QUOTE (PoMansAWD @ Jun 26 2011, 12:03 PM)
Quote:
I picked up an Actron CP9550 OBDII/CAN reader. Got totally flogged on the price ($79) because I didn't want to wait days to mail order a ~$29 China special. They had a $49 reader on the shelf, but it didn't say it was CAN compatible.

Anyhoo... P0301 and 300 show up. Cyl #1 misfire and random/multiple misfire.

Lovely. #1 is tucked up so nicely under the intake manifold and I really don't feel like removing the intake to fiddle with coils only to not solve the problem.
Ugh. Figures it would show up on one of the rear cylinders - not one of the nice, easy, front ones. Am I mistaken in my recollection that the rears are up on 'sticks' to improve the access? I peeked once, but now don't recall if I'm remembering my engine or another one.

Wish they were all built like my 300M. All 6 coils and plugs right there on top and easy to service.
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#5 Old 06-26-2011, 04:39 PM
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Cyl #1 can be reached through the IM, but I'm not sure there's enough room to pull the coil out of the well. Everything looks tight and is as clean as a whistle externally (no leaks, loose stuff or whatnot).

I just looked online to schedule an appt. with my closest Hyundai dealership (Town Hyundai of Orchard Park NY). According to the website, they're booked up until the second week of July. Just peachy. I can't wait nearly that long.

I suppose it could be as simple as a coil that failed out of the blue, w/ out warning, but it could be something like a crankshaft position sensor too?!?!
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#6 Old 06-26-2011, 08:18 PM
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Same exact thing happened on our '07 2.7, ended up being a blown coil. I can't see it being *that* hard of a job if you're a wrencher/shade tree mechanic.

2007 Santa Fe AWD 2.7
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#7 Old 06-26-2011, 09:33 PM
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QUOTE (RichB82 @ Jun 26 2011, 08:18 PM)
Quote:
Same exact thing happened on our '07 2.7, ended up being a blown coil. I can't see it being *that* hard of a job if you're a wrencher/shade tree mechanic.

Was it on the 1-3-5 (rear) bank? If I had easier access I'd be all over it. I just didn't want to pull that intake manifold with it not being a sure thing. Or maybe it IS a sure thing with just the P0300 and P0301 codes. I dunno.

The shop around the corner only had a few cars out front waiting for service (as of Sunday night), so I dropped it off with a note/key in the drop-box. We'll see what he finds.

Joel
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#8 Old 06-26-2011, 09:46 PM
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WOW did it run like poop for that one mile ride from the house to the shop! I'm glad I wasn't a long way from home. Today's catalytic converters can't take the abuse.

Joel
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#9 Old 06-26-2011, 11:49 PM
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QUOTE (PoMansAWD @ Jun 26 2011, 07:46 PM)
Quote:
Today's catalytic converters can't take the abuse.
Yeah - need to be a bit careful about that. They'll go cherry red on you in no time with a raw gas dump off even one cylinder. Here's hoping you can get it resolved quickly.
QUOTE
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Town Hyundai of Orchard Park NY
Man - you really are out in the Buffalo boonies, ain'tcha?


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#10 Old 06-27-2011, 11:16 AM
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QUOTE (canderson @ Jun 26 2011, 11:49 PM)
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Man - you really are out in the Buffalo boonies, ain'tcha?
YEEEhaw! You could say that. I actually live in the bustling metropolis of West Falls NY.
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