Help diagnosing misfire on 2007 Santa Fe 2.7, freeze frame included - Hyundai Forums : Hyundai Forum
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post #1 of 82 (permalink) Old 02-08-2017, 01:33 AM Thread Starter
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Help diagnosing misfire on 2007 Santa Fe 2.7, freeze frame included

2007 Santa Fe 2.7L, manual trans, 135k miles. Started misfiring and flashing check engine light. Scanned the codes, P0301 - cylinder 1 misfire. It had the original plugs so I replaced them with stock replacements, NGK IR's and moved cylinder 1 coil pack to cylinder 3. Pulled the timing covers and confirmed the belt was in good shape and had not jumped a tooth. Misfires are still occurring but seems to throw a code for a different cylinder each time I clear it. I have had misfire codes for all 6 cylinders. Can somebody help me diagnose this from the freeze frame?

Also has pending codes:
P2195 - 02 Sensor Signal Stuck Lean Bank 1 Sensor 1
P2197 - O2 Sensor Signal Stuck Lean Bank 2 Sensor 1
P2272 - O2 Sensor Signal Stuck Lean Bank 2, Sensor 2

Here is the latest freeze frame in the pic below, this is after the new spark plugs and moving the coil pack.
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File Type: jpg Santa Fe Freeze Frames.jpg (89.5 KB, 70 views)
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post #2 of 82 (permalink) Old 02-09-2017, 05:52 PM
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@glp86

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You didn't get any replies so I will give it a try. You could try cleaning the electrical grounds on your car, they are a known problem on Hyundai cars including Santa Fe's. @canderson has posted a lot of good info about this, you can use the search function to find his posts. Maybe you should replace all of the coil packs, they also tend to wear out on Hyundai cars. Sorry I don't know how to interpret the freeze frame data, maybe one of the pros such as @AUTOSPARK or @sbr711 will see this and comment. Good luck
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post #3 of 82 (permalink) Old 02-09-2017, 06:31 PM
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Sounds like a massive leak at the rubber MAF connector or similar kind of situation. Normal leak at MAF boot pops other codes that, while serious, don't make quite the statement that your set does. Have never run across that particular combination on a CM (yet).

I'm guessing that the poor thing can't get the mix right because there's quite a lot of air sneaking in somewhere, and consequently, that the ECU doesn't know about. When air doesn't pass by the MAF on the way in, the ECU doesn't know about that extra air, and there's no compensating amount of fuel being added to it, and everything runs lean.

Whatever the case, certainly appears that you've either got a large intake or vacuum leak somewhere, or exceptionally weird (poor) fuel flow. Strong odds for the former.
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post #4 of 82 (permalink) Old 02-09-2017, 06:37 PM
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Meant to ask if you had more than just freeze frame info. Watching the cycling of the voltage as trim changes makes it a pile easier to diagnose.
Most of your freeze frame data is pretty normal (but not all of it), but no idea where we were in the up/down cycle of the trim during that particular shot.
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post #5 of 82 (permalink) Old 02-09-2017, 10:39 PM
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Try pinching off the purge valve hose. If it's stuck wide open, that could be it!
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post #6 of 82 (permalink) Old 02-09-2017, 10:58 PM
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Usually doesn't provide such dramatic symptoms, but certainly one source of the kind of leak we're looking for.
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post #7 of 82 (permalink) Old 02-09-2017, 11:49 PM Thread Starter
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Thanks for the replies guys. I forgot to mention that I sprayed starting fluid all around the intake and plenum and wasn't able to detect a leak with that method. These misfires started about 10 miles after my wife got gas, but I assumed that was just a coincidence. I borrowed an Innova 3160 scanner so I'll try the live data function on Monday when I get back in town. What values should I monitor?
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post #8 of 82 (permalink) Old 02-10-2017, 07:07 AM
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'Scope' the O2 sensors. Want to see all 4. Would be good to see B1S1 vs. B2S1, then maybe B1S1 vs. B1S2.

No chance a load of E85 got dumped in or something crazy like that?
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post #9 of 82 (permalink) Old 02-13-2017, 11:54 PM Thread Starter
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Realized the Autozone scanner doesn't do live data so I'll have to wait a few days to borrow one from a buddy. I'll report back when I have the data.

E85 isn't very popular here in Denver so I doubt Costco has it but I'd have to double check. Maybe I should drain the tank, I'll wait till I have the live data before taking that step.
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post #10 of 82 (permalink) Old 02-14-2017, 12:17 AM
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Not only not popular here in Denver, not very cost effective, either. Figure that 85% ethanol at about 70% efficiency (vs. gas) + 15% gas at 100% efficiency (vs. itself), and you get ~75% energy from the E85 blend as you get from straight gas, and I find that E85 never costs less than 75% of the price of regular unleaded. Have never once seen anyone pumping E85 at the local Western Convenience stores, for example. I think the public is wise to it. Boulder may be another story ...

What part of the metro area you from?
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