2003 Santa Fe 2.7l V6 Misfire Cylinder 3 - Hyundai Forums : Hyundai Forum
 
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#1 Old 08-01-2011, 11:52 PM
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aimless55303
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2003 Santa Fe 2.7L V6
I began having "soft misfires" just felt like hesitations about 4 weeks ago.
I brought it in to have it looked at and was charged $103.95 for diagnostics.
i was told there were no codes to pull but they would inspect the intake for more money.
I lost my job at that time and decided to continue driving it.
A week later I drove about 25 miles and the "soft misfires" turned into hard jerking and lurching combined with huge power loss, followed by and electrical / burning rubber smell.
At this time the engine light came on and i brought it to a different shop. The code (I can not recall the code itself) came back as a misfire cylinder 3. The mechanic recommended a new coil pack at about $380. He replaced the coil pack and on the way home it was back to the "soft misfire" I thought possibly the plugs were bad (last replaced about 40k miles ago)
Considering the newly lost job, I decided to have my roommate help me with the plugs and radiator to help save me money. He was not able to do that until yesterday.
Between the new coil pack and yesterday the hard misfires happened again. Checked the code again and got the same error as before. The hot electrical melting smell came back.
Today 6 hours at the shop, and a second coil pack new wires, tested fuel injectors and it is still misfiring. he did find a loose boot on 3 but issue till happening after he replaced it. There was a mouse nest under the intake plenum, wires inspected no damage seen. He says is acting like a vacuum problem. I am unemployed now for a month and have sunk almost a grand into this issue with 126,000 miles. The mechanic said he is out of ideas (huh???)

9 months ago I had the car in for stalling and rough idling, same code PO303 they found the coil boot was not properly seated. Car ran fine until a month or so ago.

I seriously have no more resources to put into replacing parts that are not fixing the problem, nor am I in a position to get a replacement car. I am the second owner all work before I bought the car was under the dealer warranty.

Oh they did check the CAT last week when they did the coil pack. I will ask and make sure he checked the pre-CATs as well. He only showed my the post-CAT and it just occurred to me I didn't ask.

Any suggestions? I am seriously ready to park it in a bad neighborhood with the keys in it .....






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#2 Old 08-02-2011, 12:03 AM
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Sure you not blowing spark out the plastic stick that goes down hole to the plug... look at the stick for ANY discolor just above the rubber ring at end..

IDEALLY..... you replace plugs on the V6..... REPLACE the wires.. save you a lot of labor and grief a couple week later down the road with misfires.. We very rarely ever see coil fault with this engine.. crank position sensors seem to be a maintanance item any more on this engine.

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#3 Old 08-02-2011, 12:42 PM
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Here is some examples of burn wires that was misfire...

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#4 Old 08-02-2011, 02:19 PM
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aimless55303
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SBR - the wires were replaced with no change in the symptoms immediately after.
What would cause the spark to blow with brand new plugs and wires?
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#5 Old 08-02-2011, 04:33 PM
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revmup
I have a 02 Santa Fe with about 90K on it. A few weeks ago the occasional misfire turned into a dead #3 cyl. A check with our scan tool found a code PO303. As it had new wires, and plugs only a short while ago, I assumed that was not it. However I did ohm out the wire, and tried the old wire on it. Same thing. I bought a coil pak from our local parts store, (not a cheapo chain store) for something like $150 or so. When I opened up the Standard Motor Products box, I found a Denso coil pak with the Hyundai trademark on it. Surprise, surprise! The original coil was rusted severely, and replacing it solved the problem.
Guys, get youself a scan tool. It can save you hundreds of dollars, even more. You don't have to spend big bucks, ours is an Auto X Ray model 6000, it works great. We got it from J. C. Whitney It cost about $400 or so. It does both OBD I and OBDII For less money you can buy an OBDII only, but we have older stuff we work on too, so we opted for the more expensive one. It does not do brakes, but not a big deal for that money. If you want to get into that, get a brake code reader separately.
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#6 Old 08-02-2011, 04:39 PM
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revmup
As an added note, I would love to lose those graphite-core wires, and install some spiral-core wires, but at this point have not found a suitable boot. When I do, they will be gone.
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#7 Old 08-03-2011, 08:23 AM
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QUOTE (sbr711 @ Aug 1 2011, 10:03 PM)
Quote:
Sure you not blowing spark out the plastic stick that goes down hole to the plug... look at the stick for ANY discolor just above the rubber ring at end..

IDEALLY..... you replace plugs on the V6..... REPLACE the wires.. save you a lot of labor and grief a couple week later down the road with misfires.. We very rarely ever see coil fault with this engine.. crank position sensors seem to be a maintanance item any more on this engine.
sbr711- You seem to be saying it might be prudent to change out the crank position sensors at some point in a preventative manner. Any ideas on what mileage range you are seeing these failures at?
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#8 Old 08-08-2011, 02:48 PM
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revmup
Did you run a scan? What was the code? A crank sensor is a PO335. If the CEL is on, there is a code to be recovered. That is where to start.
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