Sonata NF (2006-10) :: Steady And Flashing Engine Light / Car Runs Very Rough
Sep 30, 2012
I have a 2006 Sonata 6-cyl with 124K miles on it that also has an engine light that stays on but the car runs fine with the solid light. Only on a COLD start, usually first thing in the morning, is when the engine light starts to flash and the car runs very rough. When the engine light flashes and the car is shut off for about 5 seconds and immediately restarted,the engine light again stays solid and the car runs fine. I have had this issue for approx 2 years.
One mechanic says the code that always comes up is "P0306" (cyl 6 misfire) when the engine light stays on solid. When the light flashes and the computer is read,it gives EIGHT separate codes and all are cylinder misfires (P0300-multiple misfires and then P0301 thru P0306 for each cylinder misfire).
One dealer in the Phoenix,AZ area says my #6 cylinder valve is sticking and I need a full valve job because they supposedly did a compression test on all cylinders (which I doubt they did). I have spent upwards of $2000.00 already at both the dealer and 2 other mechanics to try and find the issue. I feel it is an electrical problem (sensor or computer itself) because one would think the car should run rough ALL the time if it was the actual valve sticking,but it runs fine when the engine light stays solid. I am running out of time because my emission test is due in 4 months. I do not trust this dealer to diagnose this issue; they have proven to me they are incompetent and just want me to pay through the nose for possible fixes until they finally just happen to stumble upon the correct problem.
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Got an 07 Screw with only 50,000 miles. Yesterday, wife drove it home from work and said it would only do 45mph and didn't sound good. No warning lights were on, she said. I test drove it in the evening and it ran totally fine. Today, she drives it to work and said it ran real rough and "Check Engine" light was on. I picked it up from her work and it idles very rough and slow, and once you hit about 2000 rpm, it runs decent, maybe even normal. Below that, it stumbles and engine doesn't sound right. "Check Engine" light is either ON steady, or flashing. I don't have a code reader, so its likely going to the Ford Dealer Monday. Is there any way to read the code without a reader?
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Today I drove about 250 miles, round trip. About 75 miles from home, my TPMS warning light started flashing, then came on steady. I also received the Blue Link message about problems with the TPMS system. We pulled off the interstate at the next service station (about 3 miles) and checked all of the tires. All 4 read exactly 33 psi.
Restarted the car and continued on. After about a mile, the light turned off. About 10 miles later, the light started flashing again. It flashed for about 2 minutes then shut off again. We continued home without seeing anything more from the light.
The only thing at all out of the ordinary, is that the temperature has changed from a high of 35F earlier in the week to 70F today. There is a lot of moisture on the ground. Is it possible condensation may have affected a sensor? I have a 2013 GLS with 2800 miles on it.
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I started my Accent this a.m. The Check Engine Light is on and it runs really rough. I left it here at my apartment - it's that bad. It's got 27k miles.
The only other thing to note is that it's been very cold (for Northern California anyway) - around 45 degrees F right now.
First-time poster, haven't had any problems with the accent except for a sun visor that was replaced under warranty last week. All scheduled services done at the Hyundai dealer.
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I have a 2012 Ford Fusion SEL. In late December, the check engine light came on (steady, not flashing). I took it to a local mechanic, as the nearest Ford dealership is a 45-minute drive away. He said an evap code came up indicating that there was a problem with the vent valve solenoid, not the capless fuel filler. However, he did not have the diagnostics to research it further.
As there have been problems with the vent valve solenoid, including a recall (for which we do not qualify), my husband bought and installed the part on Jan. 7. We both drove it several times since then, and the check engine light stayed off. But when I drove it today (Jan. 11), the light was back on.
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Earlier today i left my car idling for a couple of minutes and when i got back in and started to drive the car was vibrating, almost as if it was going to stall and the check engine light was flashing. drove a bit and stopped, started the car and now the check engine light stays on constantly. I have had the light come on (and remain on) a few times in the last while but it is usually solved by tightening the gas cap. it always seems to happen when i am low on gas (100 mile range-ish) Someone suggested maybe i had dirty gas in the car and needed stabilizer. My boyfriend said its a "misfire" and to change the spark plugs.
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I have had this issue on and off for a while. happened about 2 years ago just after i bought the car, and just started last week again.
The car will be running fine, then will start to buck while accelerating, shortly after the check engine light will start flashing and the car runs like it is on 1 cylinder. shut of and start again, light remains on( not flashing), car runs smoother, but does not accelerate like it should.
took it to autozone, they said it was giving the code for random mis-fire, and O2 sensor.
2 years ago the dealer said it was loose coils, and they fixed the problem, all the coils feel tight this time.
2007 Sonata ... 3.3 V6, 70k
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My Sonata has 150k on it and the tensioners have gone bad 3 months now. This AM i got a flashing check eng. light and the car runs rough. Any relation or am I looking at plugs or coil issues?
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I have been experiencing some issues with my '06 rio5 (same engine as your hyundais). this forum is way more active than the kia forums, so figured id give it a shot here.
I am experiencing a rough idle at start up while the car is low on fuel (<1/4 tank). it idles rough for a few seconds, the check engine light flashes a bit, and then it runs fine.
The car is an '06 rio5 with approx 19k miles on it, five speed manual. Also, sometimes after refueling and it will just shut off while waiting at an intersection. Not sure whether these two issues are related, but thought i would mention it just in case they were.
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Found this out last night. On a manual AC/Heater 2008.
If you have the heater on front defrost and then push the recirculation button on/off 4-5 times, the recirc button light will start flashing and the AC button light comes on steady.
Push the AC button off and the defrost will run without the AC compressor. If you want the AC on at the same time then push the AC button.
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I know it is a random cylinder misfire code however I started my car in the morning and it was fine I moved it and put it back in my driveway. I started it up later and waited for it to heat up i came back outside 10 min later and my check engine light was flashing and my car was shaking like crazy you could tell the engine was misfiring like crazy. I had under a quarter of a tank but not empty yet. I shut it off and turned it back on and it was still doing it. I drove the mile to the gas station the way it was.
Under partial throttle it was revving to 4500 and over 5, had to let of throttle to make the car shift up a gear. I filled up and started the car again performed fine after that however the check engine light was solid now and still on. I went to my local mechanic and he read that code P0300. I changed my spark plugs that day and they were crap the original spark plugs I have 65,xxx on my car now. Car is smooth now. I cleared check engine when i saw him first and it did not come back on all day even before i changed the spark plugs later that night. Why my light was flashing and why my car was acting like that till i filled up?
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Diagnosing our 2006 Hyundai Sonata.....2.4 L engine....automatic.
While cruising along, about 40mph and up I guess...when traveling at a steady throttle and engine speed... if you ever so slightly give it more gas, sometimes it will act as though it is losing power for a second and then kick back in.....but revs will stay up....
I was thinking either throttle position sensor or (gasp) transmission.....it doesn't really feel like a slipping tranny....but wondering if it is issues with the overdrive...
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This morning started to drive to work and the check engine light came on or actually did not go off. Not sure which. Anyway it is a steady light not blinking and the car runs fine. Problem is that the warranty is out by about 3 weeks, not by mileage and I have an appointment at the dealer on Monday. If I take it to Partsource and have the code read will it delete the code or turn off the light. Just wondering as I don't want to spend money at the dealer if whatever is wrong is not covered under the emissions warranty if I can get the code and fix it myself. Don't want the code deleted either if the dealer needs it.
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Happened in the last few days of Feb/early March last year. Start the car, it coughs, stumbles, and throws a flashing and then steady MIL. This time I shut the car off, counted 10, and ran just fine for the rest of the day. Last year I replaced the battery, but it was ~6 years old anyway.
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I have a 2001 F350 with the 7.3 standard trans. The previous owner put a toggle switch to control the EBPV as an engine brake, I've never used it. It blows white/blue smoke when cold but has for the last 4 years and doesn't seem any worse now.
Last fall I ran the truck the lowest on fuel that I ever have, the light was on for a long time and I thought I would run out. I made it to the gas station and filled it up then drove home. The next time I drove it I went about 25 miles and it started to buck while going up hill. This got worse and eventually the check engine light came on and it stalled.
It wouldn't start again so I had it towed home. I got it started a couple hours later but it would run really rough and only for a minute or so then stall. It will usually start again once or twice and stall, then it wont start again until it has sat for an hour or so.
I didn't have a code reader at the time so I started reading threads. Here's what I've done to date.
Changed the oil and filter, it was way over do. New fuel filter.
The oil level in the HPOP stays about an inch from the top, I've checked it a few times after its stalled.
Dropped the tank and cleaned the screens in the pick up, no change.
The ICP had oil on it so I replaced it and a new connector, no change.
Changed the CSP with a grey one, no change.
Changed the IPR valve with one from a buddy that was on an engine that was running. The truck ran rough for a min then settled down and ran smooth. I let it idle for 20-25 minutes with no problem so I thought the problem was solved. After sitting for a month or so I fired it up and its back to running rough then stalling.
I bought a Vgate ELM327 connector and downloaded FORScan on my laptop. (I'm still not sure what I'm doing). These are the stored codes P1281, P0475, P1316, P0478, P0470, P1211. I cleared all the codes. I did a buzz test cold and the Injectors all sounded the same.
I monitored the truck while running (rough) the IPR is staying around19.92%, ICP is 701.4psi. After 5 seconds the ICP starts to climb and so does the IPR, at 12 seconds the IPR is 37.11 and ICP is 1835.1 psi the it stalls. The fuel pw,ms is around 2.50-3.0 until before it stalls, then its 1.66. The only codes that come up are P0475, P0470, B1473.
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I recently bought a used 2006 Sonata LX. I have noticed that the passenger airbag light on the dash above the heater controls flashes constantly when I drive alone (no passenger). Is there a way to turn that off? It's pretty annoying at night.
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2006 E-350 Dually Ambulance Chassis with the 6.0... Approx 125000 miles.
Recently, the truck started an issue. its an every once in awhile thing but has been doing it more recently. The OD light will start flashing and the vehicle will start to have clunking in the tranny and start shifting rough. ABS kicks in making it hard to stop. Once you turn the truck off and back on, Its fine until it does it again. Im connecting to a scanner tomorrow to see if i get any codes.
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I have a 2001 elantra 2.0 gls. It is running rough with low power and flashing engine light. It may have a bad 02 sensor but when checked for spark only the 2 and 3 cylinders were sparking. I can confirm this because when I unplugged the 1 and 4 spark plugs it made no difference in the way it was running. Next I tested the resistance on the coil packs. Both were an even 1.5 ohms. How can it be that the coil packs are good yet the plugs aren't firing? I also have moved plug wires around and have had no success.
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My 99 Explorer XLT V6 SOHC has been misfiring lately. In idle the RPM needle fluctuates a bit and the vehicle vibrates and shakes. At night when the lights are on I notice them dim a bit as the engine struggles in idle. It doesnt stall very often at all. Accelerating I notice way less power and the engine studders. Thats when the engine light comes on flashing. Then remains on solid afterwards.
I brought it to a mechanic friend who read the code and it was cylinder two misfire as well as O2 censor. I replaced the plugs and leads and censor. Noticed the plug in cylinder two had little to no gapping. Thought I had fixed the problem. Vehicle ran perfect. Three or four days later driving on the hwy same problem came back. Thinking it must be the coil pack I got one for a good price and replaced it.
Again, the truck ran great for four days and now the problem has returned. Same thing, shaking studdering and flashing engine light. I have verified the locations of the wires and plugs a few times so i believe they are all properly installed.
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We have a 2008 f250 super duty with the 5.4 triton well ever since I replaced the power steering pump its been running raggedly, it idles rough and when i get up to 50, 55, 60 the check engine light comes on i put a diagnostic reader on it and said something along the lines of ECU bank 1 an Bank 2. What that is and I've been a mechanic for almost 3 years.
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Ok on the way the my 1997 f150 4.6 L 180,000 check engine light started flashing and running rough and then the light went off, Also we took the Aftermarket Dynomax muffler off of it earlier today if that makes any difference, it still has the Cat Converter, New Plugs and Napa Wires.....
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