Hyundai Tucson Start Stall and Idle Problems
Our 2005 Tucson GLS 2WD started hesitating and quit on my wife about a week ago. The free roadside assistance towed it to the dealer who gave my an encyclopedia of recommendations to the tune of about $2K including replacing the license plate light bulbs due to dimness. The only legitimate need was plugs and wires which they wanted about $500 to replace. I picked it up and took it to a parts store who scanned it and found misfires on cylinders 1 and 3. I have replaced the plugs and wires on all six and now it won't start. Well, it starts, revs like normal, and then immediately dies. I can give it gas and keep it running but it is not driveable. I am assuming it is a sensor out but I am not getting any enigince codes. Any help or others with problems?
My car was due for inspection and oil change last Monday. It just so happened that the Thursday and Sunday prior, it randomly stalled when I was at the stop light/ stop sign. It only did it once each of the days, so I'd say maybe 10% of the time driven. It thought it was because I was low on gas the first time, but then it happened two days later (Sunday). It seems that when I decelerated to the stop sign, once I tried accelerating again it struggled and just shut off. No shaking, jerking, no noises, no warning. I took it in on Monday for the inspection and oil change and told them of the issue. They checked my battery and said it was the problem and needed to be replaced, so I replaced it.
Got my car and it seemed ok. Then it happened Tuesday evening - it seems pretty random. Once it shuts off, I just turn the car off and back on and it drives fine. I took it back Wednesday to figure the problem out (since battery wasn't it) and to get all the regular maintenace (minus engine flush...they said it had to wait) taken care. The first thing he checked was the alternator and charging system and he said they were good, not the issue. They thought some of the maintenance might take care of it since they couldn't see any other issue. Get the care that afternoon and it seems good.
Happens again Thursday morning. I notice an air sound and the car seems to struggle and the RPMs are jumpy when I'm going slower, almost like the transmission doesn't know what gear it should be in (thought it was the a/c, but now realize it is probably the air to the engine making this sound). Took it back and they kept it all day. Finally hooked it up to the diagnotic machine (no clue why this wasn't done the first day) and no codes show up. The mechanic drives it, lets it run, everything...they cannot get it to duplicate the problem. They tell me they cannot help since they don't know what the issue is. GREAT.
So, it has not shut off since, but I've also been very cautious while driving. I can definitely tell that it's driving funny though. It seems to be right before stopping (idling?) that the RPMs jump up and down and that air sound comes and goes. The car seems to hestitate too, despite my acceleration/deceleration. It feels like if I accelerate too fast from being stopped, it might die. (It does seem to drive good when going at higher speeds.) I've had the fuel injectors, idle air sensors and another air sensor (mass air sensor maybe) mentioned to me by boyfriend's coworkers, but I have no clue. If I had some idea what part of the car could be making it do this, it would be easier to get it fixed. I am nervous driving my daughter in the car as I don't know when it might shut off.
I don't want to waste another day at Hyundai though for them to say nothing is wrong
If they find anything I will certainly post. Mine is a little different as when she downshifts she gives a slight jerk. She does however shut down unexpectly when stopping on a hill or making a turn into a driveway on the decelleration.
Hope they find it!
The 3rd day i get the same weird performance, hesitating and shifting when it feels like. Then clears up and is fine for 2 more days.
I decided to take the engine cover off and investigate if any wiring harnesses wern't plugged on all the way and to just go over all connections, and all looked fine.
Ran fine for the week, put 200 miles on it without any issues. When i put the key in the ignition in and turned it this morning, it just gave a "click" like the battery was dead then started fine on the 2nd attempt. The battery is brand new so it's not a battery issue. I drove it and it had the same hesitation and shift issues again, really weird because it rand great all week. I would really like to find this issue fast....the check engine light has not come on, i have a code check device and there are no codes.
Was having similar probems with my 2005 Tucson. It periodically ran rough, occasionally stalled and the check engine light would stay on. My local mechanic didn't find anything wrong. When I drove to Florida for vacation about 2 weeks ago, the engine almost died on the interstate. I took it to the local dealer an they told me all it needed was a computer update (who knew?). They only charged me $65. ($58 of that was the minimum charge just to check it out.) I was very surprised and obviously happy, since I was expecting much more. It's been over 2 weeks and knock on wood it's been running OK.
We have a $20 Actron scan tool and it would never show any codes and there were no lights on in the dash. We borrowed an Actron Elite Scanner ($200) from a company and ran the diagnostics. Low and behold it did show a code even without a warning light. PO560 System Voltage Malfunction. The most likely fixes for this code are to repair the under hood Fuse Block Wiring and Replace the Main Relay.
My husband removed the Main Relay and it was severely corroded. He cleaned the contacts of corrosion and installed a new relay a week ago. So far I have driven it several days for different amounts of time. So far no issues and the code is cleared. I am posting this here to maybe help someone else who have changed parts and still had issues.
November 30 2021
My 2014 Tucson started stalling about a week and half ago intermittently. Stop light drive through and when take foot off gas coming to a stop once. No codes but had hard restart? RPM gaugestops working and shifts weird. Stop car when safe restart like nothing happened and normal operation. Going to change plugs and PCV valve. Maybe EGR valve too. Open to ideas. Very confused. Had very minor problems with car up till now. It's been super great and reliable. Bought it new and have 210000KM just turned over.