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Old 03-23-2008, 10:42 PM   #1 (permalink)
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ok, here is a problem that has been inconsistent at best over the last few weeks that i have owned my sonata...

while i am accelerating, (sometimes) i will feel a slight hesitation. i've been brainstorming over this problem for the last few weeks.

just when i thought it was limited to the cooler temperatures of the early morning / late night, the hesitation occurred in the late afternoon the other day when it was 80 degrees.

just before i took possession of the car, the spark plugs were replaced. however, the wires were not. is this normal? i talked to a mechanic who said that some makes/models did not require wires to be replaced during a tune-up. is that kosher?

any thoughts on this problem?
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Old 03-23-2008, 11:54 PM   #2 (permalink)
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i had the same prob with mine try this it helped me


Firstly bring the car to normal operating temperature by driving for 15 minutes or so.
Now open the bonnet and disconnect the earth lead from the battery, ensure this is not touching any part of the bodywork - insulate if necessary - and wait 5 minutes.
Next depress the foot brake for 20 seconds - this will completely discharge the ECU's capacitors via the brake lights.
The next step (to be carried out immediately, while the engine is still warmed-up) is to carefully re-connect the battery earth lead, close the bonnet and now drive the car in a spirited fashion (accelerating rapidly through the gears, full-throttle straights etc. etc.) for a full 30 minutes. Try to choose a quiet time on the roads for this, (i.e. early on a Sunday morning!).

This period of driving will `re-educate` your ECU into adopting more aggressive timing curves and alter the fuelling to match. It will also allow the unit to recognise any modifications you have made and to react accordingly.
If, on the other hand, you are not interested in outright performance, but are more concerned with economy and flexibility, use your normal driving style during this 30-minute run!.
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Old 03-24-2008, 12:06 PM   #3 (permalink)
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It could be the mass air flow sensor if that is out of wack your car will have similar symptoms
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Old 03-09-2009, 08:27 PM   #4 (permalink)
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QUOTE (italian54d @ Mar 23 2008, 11:54 PM)
Quote:
i had the same prob with mine try this it helped me


Firstly bring the car to normal operating temperature by driving for 15 minutes or so.
Now open the bonnet and disconnect the earth lead from the battery, ensure this is not touching any part of the bodywork - insulate if necessary - and wait 5 minutes.
Next depress the foot brake for 20 seconds - this will completely discharge the ECU's capacitors via the brake lights.
The next step (to be carried out immediately, while the engine is still warmed-up) is to carefully re-connect the battery earth lead, close the bonnet and now drive the car in a spirited fashion (accelerating rapidly through the gears, full-throttle straights etc. etc.) for a full 30 minutes. Try to choose a quiet time on the roads for this, (i.e. early on a Sunday morning!).

This period of driving will `re-educate` your ECU into adopting more aggressive timing curves and alter the fuelling to match. It will also allow the unit to recognise any modifications you have made and to react accordingly.
If, on the other hand, you are not interested in outright performance, but are more concerned with economy and flexibility, use your normal driving style during this 30-minute run!.

What exactly brought the car to hesitate like that, and what is happening when you "re-educate" your car?

I'm having problems with my wife's 2001 accent. It hesitates on acceleration, really only up to 3000 RPM. Also If I try pushing the car harder though the hesitation period, the engine light flashes at me, and then stays illuminated.
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Old 03-18-2009, 08:49 AM   #5 (permalink)
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Same issue here - its how I found the forum (gotta love Google!) Took it to the mechanics who found nothing wrong - checked all the plugs & such & ran a diagnostic. It will also rough idle at times. With this being such a sporadic problem it is hard to get them to catch it!
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Old 03-18-2009, 04:03 PM   #6 (permalink)
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Dear harperking and westbeach,

First, I will assume that you do not have a Check Engine Light. If you do, go get your code read at an auto parts store as most will do this for free.

Second, I will assume that you have performed regular routine maintenance as far as spark plugs, air filter, fuel injector cleaning.

Third, I will assume that you have not recently installed a CAI or SRI or caused a vacuum leak by your actions.

Fourth, I will assume that your timing belt (and the balance shaft belt on the 2.4 liter) have been replaced per the maintenance schedule.

After all this, have your Throttle Position Sensor tested. The TPS is notorious for going out on 2001-2003 Sonatas around 70k miles.

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Old 03-19-2009, 12:34 PM   #7 (permalink)
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For mine, at least, yes I planned to drive this car for a very long time so have been careful to keep the maintenence schedule accurate. This is the first problem I have had with the car. No CEL or error code unfortunately - that would make it too easy to find the problem! The only thing done under the hood recently was when I took it in to be checked - and they looked at all the plugs & wires just to make sure there was nothing wrong with them.
I hadn't heard about the sensor issue. Will make an appointment to get that checked when the next payday gets here!
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Old 03-31-2009, 01:27 PM   #8 (permalink)
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Spark plug wires!!! I had the same problem and could not figure it out for a few hours, I was going to replace the o2 sensor when I remembered an old trick. Get a spray bottle and spray water on the spark plug wires while the car is running while looking for arcs to ground. (be sure not to touch anything while you do it!!) I had quickly inspected mine in low light and thought they were good but when I sprayed them the car started running really rough. Usually you can see the sparks jumping to ground but on my 2.4 I didn't see it, maybe because the coil fires 2 plugs, don't know. Anyway the next morning I pulled the plug wires and they still looked fine until I bent them at a 90 degree angle. That is when I noticed a ton of micro cracks on several spots on the insulation. So $23 later the problem was fixed
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