Check Engine Light/running Rough - Hyundai Forums : Hyundai Forum
 
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#1 Old 07-23-2009, 06:29 PM
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kristyle_s@yahoo.com
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Hello! I have a couple of questions and I'm hoping someone can give me some assistance. I have a 2002 Hyundai Santa Fe (v6). My CEL came on and so I took it to AutoZone to have the code read. It came back with P0302 and he said it was most likely spark plugs that needed to be replaced.

I took it to a mechanic and asked them to do a tune-up including the spark plugs. It looks like all they did was replace the spark plugs and do a fuel injector flush, and $600 later, the CEL is still on and now the car is runnning really rough. They told me it would cost another $100 do run the diagnostic tests to see if they could figure out what might be causing the CEL, and didn't say anything about the car running rough. They did say it might be a couple of days for whatever they did for the fuel system to "get out of its system" and that might be causing the CEL now.

Is there anyway that I can narrow down what the issue is? I don't have a lot of money to spend and so I don't want to blindly let them do everything, since I've already spent my car repair budget and not only is it no better, it's actually worse. I'm not sure what other info I can provide, but please let me know. Thanks!
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#2 Old 07-23-2009, 06:57 PM
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kris,

You should hold the mechanic accountable for the quality of their work. Especially if this was a Hyundai dealer, they should stand behind their work.

Just for grins, just push down on each of the spark plug cable connectors on top of the plug. You should feel a click when these fully seat to the spark plug top. This may be one cause of rough running.


The fuel injector flush might leave your car running rough, but only for 30 miles. If you are still running rough, they did something else to your Santa Fe. Unfortunately, you may have a vacuum leak between the upper and lower intake manifold. this is common but easy to fix. You can check for this with a can of carburetor cleaner. You spray this along the front seam between the upper IM and lower IM. There should be NO increase in RPM if you do not have a leak...otherwise the RPM will leap up 800 rpm suddenly.

You should also check if the hose connections before and after the MAF sensor are connected and tight. The MAF also has an electrical harness connector that may be loose also.

You can also get your code read at most Auto Parts stores for FREE. This is another way to identify a vacuum leak...the computer will tell you.

Byron

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#3 Old 07-26-2009, 09:04 PM
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kristyle_s@yahoo.com
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I took it to another mechanic since it was still running badly, and they replaced one of the spark plugs and said that if it did it again I would need to have the injector replaced. It worked really well for a while, but then the Check Engine light came back on again and it started running a little rough again (although not nearly as badly as before they replaced the one spark plug.

So, it looks like I'll need to have the fuel injector replaced, which I'm hoping won't be too expensive since I've already spent a good bit of money and it sounds like what they did to the clean the fuel system may have contributed to this new problem.
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#4 Old 07-27-2009, 10:55 PM
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DSHornet
QUOTE (kristyle @ Jul 26 2009, 07:04 PM)
Quote:
I took it to another mechanic since it was still running badly, and they replaced one of the spark plugs and said that if it did it again I would need to have the injector replaced. It worked really well for a while, but then the Check Engine light came back on again and it started running a little rough again (although not nearly as badly as before they replaced the one spark plug.

So, it looks like I'll need to have the fuel injector replaced, which I'm hoping won't be too expensive since I've already spent a good bit of money and it sounds like what they did to the clean the fuel system may have contributed to this new problem.
Maybe, but it's really easy to fail to get the plug cables seated securely on the spark plugs. If they didn't give a little "click" as they pushed down on the tops of the plugs, that may easily account for the misfire.

Paw-paw Don, y'all
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