2005 sonata 2,4 missfire

Firstly my deep apologies for poor language skills as I am just a stupid
dane. Now on to the real problem, I have bought a 2005 Sonata with 37000 km
on it this february and I am not sure that it had the missfire when I bought
it (haven't noticed) or if it is something that has developed over a couple
of months. It is hardly to notice, only when accelerating in 3rd I can feel
it to the extend that it bothers me. So anyway, took it to a mechanic for
normal service and told him about it (he took a testdrive and felt it too),
he replaced the sparkplugs but it has not helped at all. I called him to ask
him what else could be the problem and he said that I should change from 92
octane to 95 octane, that might be the problem (something about keeping the
low emmissions only when low octane), but that didn't help either. So now
before going to the bank to get all my savings out so the mechanic can
splitt the engine apart and find the reason for the cars behaviour, I
thought I'd drop a line here and hope that somebody had an idea.

Brian

 

Your language skills seem just fine to me.
You did not say if its an automatic or manual transmission. I've had two
auto 2.4L sonatas in the last ten years and if yours is an auto xmission I
maybe can explain what you are feeling. When you combine a low HP 4-cylinder
with a auto xmission with torque converter lock-up and then program it to up
shift quickly(to conserve gas), you will get a lugging sensation at low
RPMs. Its similar to how a straight stick feels when you slow down and
don't downshift quickly enough. This occurs in both of my Sonatas at 40-50
MPH with gentle acceleration. It goes away at highway speed and of course
if you kick it a little, then it stays in lower gears longer and doesn't do
it(or not enough to feel it). You have two choices, you can get used to it
(ignore it) and laugh passing the gas stations or you can drive more
aggressively and pay at the pump. I've long ago got used to it.
If you have a manual xmission, I would think that you would have more
control over the shift points and would not have the same problem. (but
maybe so if you are trying to save money)
In any case I would not start throwing a lot of money at it unless its
really annoying. With all the electronic sensors these cars have in them,
they will pick up on any serious problem before it causes a problem. They
will very quickly detect and report a cylinder misfire.

 

Sorry I forgot about the manuel/xmission, it's a manual gearbox. It is both
at accelerating slowly and fast but it doesn't seem to be all the time. Also
it was the mechanic that said it was a missfire and he said he could feel it
not only in 3rd. but that he also could feel it in other gears. I have to
say that he is not a autorized Hyundai shop and I have no idea if they can
detect the problem with some kind of computer hooked up to car. But thanks
for your imput, highly appreciated.

Brian

 

try spark plug wires



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Replace plug wires and plugs as a set. If you have arcing in either the
wires or plugs it will leave arcing on both so they must be replace at the
same time

 

Hopefully, you haven't taken it in for him to tear apart the engine yet.

There are other things to check before diving deep into the engine. I
addition, one typically wants a good indicator that the problem is insid
the engine (such as low compression or high cylinder leakage) befor
diving deep inside.

As has been mentioned by others, suspect plug wires. Also suspec
ignition coils, fuel injectors, and the ignition failure sensor.

While I'm sure I don't have complete information, I'm not convinced tha
the mechanic looking at your car is knowledgeable enough to diagnose thi
problem. I suspect you may be better off taking the car to someone else