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Hyundai Tucson Acceleration Problems

Hello - I am new to this forum. Had my 05 Tucson since 6/06. Bought off the lot for a good price since prior year model. Had no problems up until now. Just hit 40,000 miles. And over the last month, have had a couple of issues with acceleration. First time it happened, I was going down the interstate at about 70mph and then all of the sudden the acceleration died. Car went from 70, to about 30mph. Was able to get to side of road w/o getting run over and had my foot to the floor with the gas pedal just to get the car to move. Engine was "missing" but never stalled. Had no power at all. Finally got to gas station and let it idle in park. Pushed the gas and the engine rev'ed up. Put the car in drive and no power. Shut it off for a little bit and started again. Car is fine. My dad checked the air filter and it was slightly dirty. So we put a new one in about 3 weeks ago. No problems. Until today. Same thing - on interstate, lose power, etc... Does anyone have any idea what this could be? No engine lights come on, no overheating, nothing!!! Sorry to be so lengthy, but wanted to get an idea before i took to dealer and they tell me its "nothing"


  • greatcarsgreatcars Posts: 66
    Let dealer's mechanic drive in interstate road around 80 miles per hour for a while. I believe the problem was triggered by reaching a certain speed. It surely had problems.
  • dalev2dalev2 Posts: 2
    I recently had the identical problem this weekend while on a trip from Asheville, NC. My wife's Tucson (2005) lost power at about 75-80 mph when automatically downshifting to go up (what I consider to be) rather inconsequential hills. I could stop the problem by manually upshifting the auto transmission but this (obviously) ends up lugging the engine and, when it downshifted, the power loss again happened This loss of power on hills occurred throughout the day, including the identical power loss when stepping on the accelerator at a stop light (not the normal fuel injection delay...but, instead, a distinct power loss akin to running on 3 cylinders). Today ( Wednesday), the car runs fine and I am unable to duplicate the condition. What was your dealers prognosis?
  • I had the EXACT same problem with a 2005 Tucson that I recently bought used. Did any of you ever resolve this problem?
  • Hi all - Dealer "said" an air hose had come loose and that was what caused the problem. Funny how it has happened several times since then... Actually 2 - 3 times since then. One time the car actually died on me in the road. And most recently again going down the interstate. Can't figure out what is triggering it because it happens at various times from a low in town speed to interstate driving. But always when I accelerate. Plan to take to dealer again soon.
  • sa258sa258 Posts: 3
    Hello - I have been driving Tuscon 2006 did not have any problem until 34000 mile, the engin died on the stop sign 6 times and once when I was driving 35-40mph. the engin starts without proplem. I made 4 trips to the dealer and they can't find anything wrong with the car. Does anybody have the same problem? If so what is the solution? Help!!
  • ynk4rynk4r Posts: 1
    I haven't seen any solutions to the problems above.. can someone help? I have a BRAND NEW Hyundai Tucson and the engine keeps giving out on me. 3 months ago it stuttered and then DIED when i came to a stop. I started it again, and everything seemed normal. I took it to the dealer, and they couldnt' find anything. A month later I felt the SAME stutter mid highway 60mph drive and this time I didn't stop, and thankfully, car recovered and kept driving normally. Did not bother taking to the dealer this time. LAST WEEK, in mid traffic, car suddently died I was at a stop, I restarted it and it died immediately. So I restarted and kept my foot on the gas and this seemed to keep it alive, as soon as i got out of traffic into open road it stuttered again, and this time DIED mid drive with my foot on the gas. I came to a stop and tried starting car, this time it was no use, car wouldn't stay on. Had to push it to the gas station. Next day at Dealer.... CAR WORKING JUST FINE!!!!!
    So is this a dud?! A bad apple? Is this a computer problem? Or is there some physical cause to this problem that anyone has found? Because of it's randomness it makes me think it's the computer, will resetting the computer like the dealer did going to work? Or could it be the Oxyegen air censor, or fuel filter? Anybody got any ideas? I get NILTCH from the dealer... but because it's in its first year and under warranty I have to keep taking it there.
  • sa258sa258 Posts: 3
    After taking to one dealer 4 times they could not come up with any answers, the last time I was at the dealership they said it could be the loose air duck. They did checked and it wasn't it. I decided to take it to different dealership, they might be able to locate the problem!! I hope...., If they come up with some answer I will let you know. This been going on for 9 months I am ready to trade in for different car. If you get some answers please let me know.
    Thank you
  • jon12pagejon12page Posts: 2
    ynk4r AND sa258 -- I wish I had an answer for you both. But it sounds like your problem is much different than anything I encountered. I was having acceleration problems at high speeds after 100 miles on the Interstate. My Tucson has never stalled out on me.

    pcherry328 -- I ended up having 3 different places try to diagnose my problem (2 were Hyundai dealerships and 1 was a little shop in the middle of nowhere). All 3 had different ideas. The little shop suggested that I had some water in my fuel. Not sure if that's the case.

    Either way, I've only had the problem when my tank was below 1/2 a tank. So now, when I go for long trips, I stop every 100 miles and fill up the tank. So far, so good.

    Sure, that's not an ideal solution, but it beats the alternative.

    Have you been having better luck, yourself?
  • kytcougkytcoug Posts: 3
    I am having the same problem described by everyone above -- engine was fine until 60K (when the warranty ran out) Tucson engine gives out on interstate, sometimes on my local country road at 50 mph. The engine looses power for a while, check engine light comes on, then problem corrects itself and check engine light goes off. Shops never see anything because the engine sensor reset and don't store in memory why the check engine light comes on.

    My mechanic suggested it might be the crank shaft sensor (tells the fuel pump how much fuel to give engine). He showed me 9 webpages of complaints from owners describing the same problem and the crank shaft sensor was the source. Since then, I have had one delay and the check engine light came on--so not convinced that was the issue. I have wondered if using the cruise control might cause some of these problems, maybe it gets"stuck" Perhaps fuel filter and pump, but that's a huge cost.

    Anyone have any suggestions on this one?
  • butch30butch30 Posts: 1
    I just am wondering if all of you have 6 cylinder automatics. I bought a new 2006 Tucson with the 4 cylinder 2.0 liter 140 horsepower engine. It has the locking 4WD which was the last year they offered it with the standard transmission. So far at 48,000 no problems whatsoever except for a leak in the power steering unit which they replaced without a problem. I find the 2 liter plenty powerful with the standard tranny although very steep hills are a problem. I routinely use it to haul.

    I'm just wondering if this is just a problem with the 6 cylinder models and the auto. If so; the problem may be transmission related. I have never liked automatics and will always go for the standard if offered. I would suggest that you may want to go to non dealer mechanic that you trust. I never go to the dealer for maintenance. My mechanic of 20 years seems to have kept my Tucson going with no problems and no unwarranted maintenance. Your dealers may be hiding something and from the maintenance section of this forum; they are quite a few dishonest dealers out there who depend on your maintenance and repair dollars for their survival in this economy!
  • kytcougkytcoug Posts: 3
    I do have the 6 cyl. auto...had the fuel pump and filter replaced and no more stalling problems..i can feel it getting more power. Lets hope that did the trick.
  • sa258sa258 Posts: 3
    Why did you have the fuel pump and filter replaced?? Did any lights came on to let you know where the problem was??
  • kytcougkytcoug Posts: 3
    The check engine light did come on and the code was a misfired 5th cylinder. My impression was that the engine was not getting the gas it needed as it would cough and stutter when I tried to climb hills or increase power, the pump and filter seemed to be the cause.

    While the new the pump and filter did improve road performance, now I have a long crank before it starts up. Upon further inspection, we noticed an air filter control valve for the gas system that was completely clogged with dirt; the mechanic banged about two cups on the telltale red dirt from the road I live on. With this clogged the engine does not get the correct gas/air ratio, the engine floods and will not start until it can get enough air the third of fourth try. It also starts easier when colder outside (air is more condensed) then when it is hot (air expanded). This could also cause the engine to struggle when more power is needed...basically the engine can not breath.

    I bought a the 4x4 Tucson small because I live in the mountains on on a dirt road. I also drive many back roads looking for hiking and camping spots. What seems really stupid to me is that a 4x4 SUV has a system that gets clogged with dirt after only 1.5 years of ownership.
  • dalev2dalev2 Posts: 2
    for what its worth, my Tucson has never been off road, I don't live on a dirt road, and the air filters have been changed (by me) at twice the rate that is suggested and yet I encountered the problem going 60 I don't believe it is due to a clogged air filter, etc. As for changing the fuel filter and pump, Hyundai in their inscrutable way saw fit to put both of these items in the fuel tank. Good Luck trying to replace these at home, since it requires draining and dropping the fuel tank. The stalling is an obvious problem that seems to be occurring to a number of people and its only a matter of time before someone is involved in a serious accident. I guess both Hyundai and the government will look into the problem then. Until that time, cross your figures and hope nothing happens. Since the problem occurred in my wife's Tucson more than a year ago, it has not reappeared. C'est la vie.
  • Brand new 2009 Tucson, driving it home from the dealership and it did exactly as described, stalled at a stop sign. Car is still at the dealership 24 hours now with them completely unable to figure out what is wrong. The diagnostic computer is getting nothing from the control unit, even after they swapped out units from other Tucsons on the lot.
  • Bringing our 2009 Tucson home from the purchase, it did exactly as you described. I had drove a deliberate 55 mph home from dealer, a distance of under 10 miles. First stop sign after exit from the hwy, it did the sputter/stall/not start thing. Had to shut it down and restart before it recovered.
    Took it back to dealer and they are (still at the time of this writing) unable to get any information out of the control unit (diagnostic computer is completely blank when hooked up to unit). They swapped out control units but problem remains of no info coming out.
  • 4 banger with auto. A/C was running at the time. Like I said, was coming home from dealership 1st time so don't think dirt etc. a problem (3 miles on vehicle, 13 when got home).
  • I am having similar problems with my 2005 tuscon 6cylinder automatic. The problem started after I changed the battery and the sparkplugs and wires. Incidently one of the mechanics that looked at it told me it did'nt have a gas filter. The dealers told us it needed a new computer chip. For about 3500 dollars. I have to believe it has something to do with the tuneup and new battery. Did anyone on this thread every get this issue resolved?
  • ggeeooggeeoo Posts: 94
    You may not believe this but all these symptoms are classic vacuum hose that are
    used for the smog system. Do it yourself go to a napa or pepboys or ace get
    3 feet of plastic tube clear or black and replace every hose under the hood the
    smog system always has a diagram. One of your is cracked or loose or not put
    back on right during a servicing. each of the little hoses are 3 inches long.
  • nakoonakoo Posts: 1
    Bought 09 GLS in October of 09. Have had alignment problem from day one. Pulls to the right. Took to dealer 2 times so far and was told its due to the road slanting to the right. Was told tire rotation would help, after spending $21.00 at dealer, still pulling to the right. Took to Tires Plus, did alignment which helped a little, but still pulling to the right. Have approx 8,000 miles so far. Anyone having this issue or any suggestions to getting this fixed.
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