Accent MC (2006-11) :: Misfire On 2 Cylinders - Location Of MAF Sensor?
Jun 15, 2015
I have a 2009 Hyundai accent. 2 cylinders misfire. I changed out the spark plugs after the misfiring began and the 2 cylinders that misfire don't follow any specific ignition coil, it's just 2 random ones.
Looking at the data with a reader points to fuel injector number 1 not working properly. The first few seconds the car is on the check engine light blinks and fuel injector 1 spray duration (fluctuates based on gas applied) changes just like all the others. However, when the check engine light goes solid (then the misfire code is thrown) fuel injector 1's spray duration is stuck (usually around 3.5 ms)
The cable going into the fuel injector powers those little troubleshooting lights like it should until you plug the cable into the fuel injector OR remove and replace the light a few times.
I don't know much about cars but someone told me to try cleaning out the Mass AirFlow sensor as they had the problem above and the MAF sensor was the cause. I can't find anything on where the MAF sensor is located though.
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After scouring through hundreds of threads on this forum (which is Awesome, BTW), it seems as if this misfire / rough idle thing is fairly common (which is scary!!). CEL is on steady. Had the codes pulled; P0301, P0302, P0303. At the recommendation of the mechanic, I had the plugs replaced...no improvement. He then replaced the ignition coils...no improvement. Just finished replacing the MAP sensor. This actually had a VERY temporary positive effect. However, after about 5 miles of driving, the misfiring returned. Took the car to the Hyundai dealership, and they acted as if they didn't want to fool with it. They referred me to a couple of local repair shops...????
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I have a 2009 accent.. fuel pump went so I just replaced it...it pumps fuel but not getting any fuel to the cylinders...had a plug out to test the spark and it has good spark but plugs were dry and very faint fuel smell...also changed the crankshaft position sensor.. what could cause a no fuel issue??car ran fine, shut it off and no start..checked the fuel pump and it wasn't working though it had power to it...why the injectors wouldn't be working??
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I just dropped it off at the auto repair shop.
Could it be a I'm just wondering if I shouldn't have taken it to the dealer as the printout says it could be a CPU issue?
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I am currently having an issue with my 07 Accent misfiring on cylinder 1. So far, I have changed the spark plugs, which were due anyway, and checked the coil pack. Every coil on each cylinder reads 0.8 ohms, so I am going on the assumption that they are ok. Didn't see any issue with the connector end inside the boot. However, when I changed the plugs, I discovered that I had oil in the plug tubes on 1 and 4. So I changed the valve cover gasket and tube rings and cleaned all oil residue from the packs. I have also checked the short coil wire harness right on the packs themselves. Have not tried to check further because I don't know which pins that harness goes to on which ECM connector. I still have the misfire, and I'm not sure where to go next. I was thinking compression or fuel injector. I don't have a compression tester, and I assume the only way I can check the injector is to swap it with another cylinder?
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My car has been really acting up lately (AGAIN) so I took it in to have it looked at and they came back and told me it had multiple cylinder misfire, and they wanted like $1200 to fix it. What in the world does that mean and what is entailed in fixing it? They mentioned doing a full maintenance on it.
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