Sonata NF (2006-10) :: 2008 2.4L GLS Hard To Start And Idles Rough
Nov 22, 2015
I have a 2008 2.4L Sonata GLS with 96K mi. It is hard to start and idles rough. I cleaned some components and changed spark plugs. I disconnected the negative battery cable to see if it would reset and relearn settings. Took a 15 mi drive and read codes and P0016 was pending, it was still idling rough and acceleration was still under par. I then cleared the code. I purchased a new cam sensor and compared the Ohm readings between the old and new Cam position sensor. The Ohm readings were different by 50% so I assumed the old was indeed bad.
I installed the new sensor, repeated battery disconnect for 10 min, then restarted engine. It was still idling rough (maybe a little better) so I rechecked for codes. P0016 was still a pending code. I cleared the code and P0016 cam right back. The battery is good (no charging issues), timing chain is original (no noise). Is there a way to test the crank position sensor before buying a new one? I've also seen in posts the Oil Control Valve (OCV) affects timing and seems to be a problem for these vehicles, however I have not received that code (P0011). I can limp it to work but will have to take it in if I cannot solve this soon. If it ends up being a timing chain problem what ballpark price should I expect to pay to have it done.
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After sitting engine cranks longer than it usually did before it starts. idles a little rough. engine light comes on after it been running about 30 sec for 1 min. after that seems to run fine.check codes po446 and p1633 always come up. if you let sit a bit with key on starts right up.replaced gas cap checked evap lines, and changed filter no luck. Did notice with lines off evap solenoid key off or on i can blow through it. that doesn't sound right.
Checked fuel pressure. key on jumps to 90psi then falls to 55psi and stays. turn off key and leaked off 10psi in 5 min.start engine while watching gauge does the same as when the key on except it falls to 30 to 35 psi and bounces between them. i think this is way low. What is the correct pressure? Shut off engine and drops to 20 in 5 min. Next I plugged line on test tee going to fuel rail and tested same results as key on. the convinced fuel pump was bad since regulator and check is there. replaced pump. problem still there.
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i have a 1994 mitsubishi diamante 3.0 sohc hard to start and idles real rough. it has new plugs,wires,cap,rotor button,fuel filter,and air filter.fuel pressure is between 45 and 50psi which is good i have good compression on all cylinders timing belt is good and i am getting spark to all plugs. with the car running i pull the plug wires off and cylinders 1 3 5 makes a difference but 2 4 6 their is no change.the car was setting for two years.it dose have new gas.the check engine light is not on and has no codes.
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I have a 2007 Ford F-150 5.4l v8...
Codes
P0012 int cam position timing over ret bank 1
P0022 int cam position timing over ret bank 2
P0300 random Missfire detected
P0316 engine misfire detected on start up
P0340 cam position sensor curcuit fault
P0345 cmp sensor a circuit problem bank 2
Starts rough, idles rough and stalls occur often when start, after it runs for 5 minutes and sometimes dint starts at all. I replaced spark plugs, coils, cam shaft sensors and had oil changes done and. No effect.
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Maybe I'm paranoid but after changing just the oil filter, the engine started to make nasty noises for 5 seconds. Could this be symptoms of a dry startup? If you didn't read the thread, I changed the oil filter only because the Bosch oil filter was making my engine noisy. I changed to OEM Hyundai filter. I even put engine oil in the filter before inserting it into the engine. Does dry startup happen to all cars after changing the oil filter?
I came across another thread this morning after encountering the same issue with a Bosch filter (the cloth one) It doesn't have a lip on the top/bottom and uses a fiber on both ends instead (Which I'm assuming is causing a dry start). I also encountered some nasty noise on startup after installing this filter for the first time (usually use WIX/Fram Extra Guard) as per availability. Bosch just has a different design (cloth on the ends compared to plastic lip). I suppose I'll be picking up a new filter after class today.
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I have a 2010 2-door accent, automatic. Today after driving about 45 minutes (engine warm), I stopped the car. When I tried to start again, it wouldn't turn over. Turned over on the third try; tachometer read at 0. Managed to drive home (35 miles), and the car did shift from gear to gear, but engine sounds tinny on idle. Turned off car at home and turned back on, still rough start and tinny idle but tachometer appears to be working again. No check engine light. At a loss; I've heard that there are a couple of crankshaft sensors that could do this, but I really don't know. Car is regularly serviced and has new belts (belts look fine), new strut plates, new tranny fluid, all about 6 weeks ago.
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I'm a diesel mechanic and know my way around Powerstrokes, this 4.0 is not what I would usually work on, but I have a friend who has 2006 explorer 4.0L SOHC, someone told him he needed a motor with out explanation why, so I didn't want to see him get ripped off. The problem is it idles very rough, hard to start, and stalls. There's no DTCs , if you hold the accelerator slightly it will stay running, but once you let off it will either idle really bad and misfire or cut off, once pushing the accelerator the rpms raise very smoothly up til 3500 which is what I assume the rev limit is in nuetral.
I've done checks with focom and forscan, I was thinking possibly a bad fuel pump, while monitoring fuel pressure I see a range of 289 - 326 kpa with 26% fuel pump I guess duty cycle would be the correct term(once again I'm a diesel guy, and use to dealing with IPRs and Hpops) not sure if the desired fuel pressure is relevant on these but it always stays at 269kpa. I believe that equals out to 40-48psi while I believe this system is supposed to have somewhere in the range of 60 - 70, but I wouldn't expect to get a rough idle with no load with almost 50 psi of fuel pressure.
So with no DTCs Im baffled, and don't want to start wasting money just throwing parts at it. I've thought everything from fuel pressure sensor, to coil pack(replaced 4 months ago) to crank and cam sensors.
I did end up getting a code p106, but I believe this is because I didnt tighten the intake hose after checking the throttle bottle, I just slid it back on. out of the 4 days of testing first time I seen a code pop up besides unplugging some sensors here and there to make sure the pcm would actually register a dtc.
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I have a 2006 4.6L that's hard to start when it's relatively cold outside.
Normally, when it's warm outside, I can barely bump the starter, and it starts right up. But when it's cold outside, it usually takes 3 or 4 2-3 seconds of cranking before it starts. Even then, it has a really rough "about to die" idle, until about 10-15 seconds, and then it idles without a problem. Once it's running, it runs great.
It has 79k miles on it, and all I've done to it is put in a throttle body spacer, and a K&N filter. I've read a few posts from people that have had similar issues, that had K&N filters, but their problems have been more consistent. Mine only seems to happen when it's first started.
As far as I know, the plugs have never been changed, as with the COPs. I've heard about a vacuum line running to the throttle body may be the culprit, but haven't been able to find any more details on that, like where the line runs to, possible replacement part number for it, etc.
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I have an 07 f150 v8 5.4 and it idles very rough. When i start it it seems to start really rough and just about everytime im stopped its shaking just enough to annoy me. Do you think its the spark plugs? I took into the dealer about a month ago and they said everything was fine. But its still doing the same thing. Also the A/C tottaly sucks is that they way it is? When I accelerate the cold air gets kinda warm and it doesn't get cold until i get up to speed.
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I recently replaced the plugs cuz I had a rough idle all the time. During plug change when I discovered they had already been changed I found one that had a burned off electrode. Does this mean a lean condition exists?
After plug change it runs smoothly but only after 10 min warmup in our canadian winters. I can drive it when its not warm but seems to have less than full power and idles very badly after driving w/o proper warmup.
Next I changed fuel filter and checked fpdm, it was a little rusty but not bad so i just mounted it 1/4 off steel to prevent further rusting.
Since then I have installed a programmer [diablosport] but found no codes since i had battery disconnected for filter change. no new codes in last few weeks since.
So do I have a lean running cylinder causing this poor cold idle or a rich cylinder? It must be a clogged or dripping fuel injector right?
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I have a 2006 PT Cruiser with approximately 94K miles on it. This year I started a 2-hr round trip commute every week day, so the car went from getting ~200 mi. a week on it to ~700 mi. a week. I bought it used ~4 years ago with 28K mi. on it.
2 months ago, the car started shaking between the speeds of 50 and 60 mph. Not sure how to best describe it - kind of a shake/jerk, like someone was jerking the car forward very quickly and repeatedly. It seemed to be strongest in the front of the car on the passenger side, although you could feel it throughout the car. I took it to a repair shop. They balanced the tires, but that only very mildly worked. Then they changed the front axles (said there was a lot of play in them). They replaced the brakes, rotors, and timing belt at as well, for unrelated reasons. With new front axles, the shake disappeared, but the car has been idling incredibly rough ever since I got it back. You can see the steering wheel vibrate and feel it in the seat when I start the car or am stopped with it running. This never used to happen.
Additionally, the shake has now returned, but from the driver's side of the front of the car now. Again, it's between 50 and 60 mph, although it's slowly creeping up into the 60-65 range also. It's stronger if I'm pushing the gas down more, like when going up a steep hill. If I'm going downhill at 50-60mph, I don't notice it or barely notice it. On flat ground it's noticeable, uphill it's becoming severe.
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I have an 06 F-150 4x4 with the 5.4L Flex Fuel V-8. The truck has 133,000 miles on it. This morning, the truck was very hard to start. It took me 4-5 times of cranking the engine for 30 seconds or more before it started. Once it starts, it idles fine. Out on the road, the engine cuts out and the truck bucks pretty hard. The truck doesn't die, and the issue is intermittent. I changed the fuel filter less that 10,000 miles ago. The Check Engine Light has NOT come on. What could my problem be?
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So the car is a 1999 golf gti with a 2.0 AEG with a 5 speed manual. My brothers car. He has been telling me its been hard starting in the mornings for a couple months, sometimes it dies, sometimes it idles at 500 or lower, he has to rev it up to 1500 to get it to warm up then in kinda stays normal till he cold starts the car again, then does it all over. So he was driving down to my house to leave it with me to look at and on the way over he heres a big bang. has the car towed over here.
Cyl #3 has backed itself out and clearly a serious misfire, threads look fine so I put all new plugs in oem ngk three prong, runs ok still too low 400/600 stalling a couple times. this morning i installed new wires (Bosch)and a coil (aftermarket) and it barely wants to run now, stalled instantly. So I put the old coil back in and it stays running but watching the motor, its clearly misfiring. No codes as of yet and i have no access to vagcom. I've checked the firing order and wire placement on coil like 8 times to make sure it is correct.
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I recently replaced the timing belt, water pump, tensioner, all accessory belts. Made sure timing marks were spot on, did the 2 revolutions of the engine by hand, tensioner pointer was still in window per instructions. I noticed right after the car seemed not as responsive, or zippy, but did start and run fine for 340 miles. Than out of nowhere, it became hard to start, acting like it was out of time, so I removed top timing cover, doubled checked, everything, I even went as far as advancing the timing belt 1 tooth, than rotating engine by hand, than trying to start the vehicle. It still acted the same way, so I tried retarding it 1 tooth back from the original position, still the same issue. So I reinstalled it back to the correct position with, white crank mark @ TDC, and cam pulley hole lined up with the red painted groove in the cylinder head. Installed tensioner per Gates instructions, attempted to start, after 3 or 4 10 second cranks car will start and purr like nothing is wrong, take it for a test drive approximately 1 mile, car starts bucking, came back home. Pulled codes, tells me P2626 for o2 sensor.
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1993 Buick Regal 3.1l V6 Multiport injection
Problem: The care currently has a hard start, and a fluctuating idle. I bought the car a year and a half ago it still has low miles about 94,000. The care used to start fine but had a fluctuating idle in the range of 750 to 2500 rpm. My brother who is a mechanic and doesn’t live near, do all the gaskets when he visited. Then the idle fluctuation dropped to 750 to 1000rpm, when the car rpms fluctuate there is a whirring sound I can hear from the cab, like a pump or pull system. On occasion there is a vibration as well but it is inconstant and irregular. Fuel pressure seems to fluctuate as well. If the car will not start I give it a little gas and it will run fine after a minute or two, but then the idle starts to fluctuate.
No fuse issues I can tell and relays seem to be fine.Checked for lose wiring connections found, none. I have replaced:
- Hoses and gaskets
- Starter motor
- Battery
- Fuel Pressure regulator
- Fuel Filter
- Spark plugs and wires
- TPS
- Idle Air control Valve
- Crank shaft sensor
- PCV.
Right now I’m thinking it could be the fuel pump (a nightmare to change on this car), a fuel injector failing, and the ignition switch.
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I have the strangest problem on my 2006 Audi A6: whenever I fill up my tank with gas the car has a very hard time starting. This has happened 3 times in a row now. I run the tank fairly low - to about 1 quarter tank or a little lower but never to empty....then I fill the tank. When I get in the car to start it, the engine just keeps turning over trying to start but will not start. Then I stop trying, let the ignition rest for a bit, and try to start it about 5 minutes later and it starts just fine on the first try.
What could be causing this?One thing that has also started happening around the same time as the problem above is that when I'm idling at a stop light, I notice the car may start to idle roughly and seem like it is about to die out. I am the first and only owner of this car...I take good care of it and am an easy going driver. But I do drive a lot and have about 200,000 miles on it after 7 years.
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I have an 08 2.4L Sonata with 95000mi. When turning the ignition it will crank and sound like its about to start but won't. I was able to get it to start by pushing the gas pedal a bit when it sounds like it wanted to start. Once started, it ran rough and would stall unless I revved it above 1500 RPM. Still sounded like it occasionally miss fired.
I kept it revved until it reached normal operating temp. When I took my foot slowly off the gas, rpm dropped to about 500-600 and it seemed to pulse . I think engine was raising throttle to keep from stalling. It stalls if I try to put in gear without pressing on gas to raise throttle.
The spark plugs were changed at about 70K mikes. I have not read any codes as the car is stuck in the driveway. Could it be a vacuum leak? I know the Entourages have air intake hose leaks that cause rough idle but with a 6 cyl it still runs. Fuel pump problem?
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My 2008 Hyundai Sonata wouldn't start on two separate occasions after I had refilled my tank. The first incident happened a little over a month ago (early August 2011), the starter would crank, and crank, but no signs of life in the engine. Tested the spark plugs, I was getting spark, but the sucker wouldn't start. The car was only at about 55k miles when this problem began.
I had the car towed to the dealership, and they said after 4 long attempts, they got it to start. I took it home, and the next morning I couldn't start it again. Towed it back a second time, and it started right up for them. Drove it back home again, and for a little more than a month, the car ran fine, but things started acting up again.
A few days ago the wife pulled the car out of the garage (fyi: my garage is level) stopped the car on our slanted driveway and when she came back to start it just minutes later, it hesitated, but did turn over. I filled up the tank, parked it in my garage and the very next morning, I could not start my car again.
Called for a tow from AAA, and the driver said "let me try something". Pulled out a hammer, and wacked the bottom of my gas tank 4 or 5 times. The tow guy gets in, tuns the ignition to engage the fuel pump (didn't turn the key all the way), he does this about 4 times, then the very next turn of the key it starts right up. The driver said it sounded like a bad fuel pump.
I drive the car back to the dealership (this is the third time) and talk to the same guy I had dealt with all along. He calls me later in the day to tell me they finally got it to not start and were able to isolate the problem to the fuel pump sensor. They replaced the fuel pump assembly and I was off and running.
To summarize:
*Refilling the tank on two separate occasions seemed to be related to the car not starting the following day.
*Towing the car allowed the car to jostle back & forth, which for some reason would allow the dealer to start it when it arrived.
*Was able to start the car by hitting the fuel tank (just underneath it) with a hammer, turning the key 3/4 of the way on a few times, then turning the key all the way.
*Dealer diagnosed bad fuel pump sensor, and replaced fuel pump assembly.
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I am trying to solve a mystery on my mom's truck. It's an '06 4.2L F-150 STX with about 133k miles. It had a check engine light on until today- I cleaned the TB and changed air filter yesterday, and both were filthy. Code vanished later on while driving.
I want to check the PCV because the truck idles high and rough in any setting from park to OD, stopped or moving. Worse when stopped though. Entire coil pack has already been changed due to previous misfire problems. This feels similar to a misfire but without the acceleration hesitation. It has also had a recent oil change, and fuel/oil filter change as well.
There is only one hose connecting to the intake on this truck, and it appears to be a vapor line of some sort to the valve cover, but isn't a PCV cause it's just a hollow tube. There is nothing else coming out of the TB at all, except for the throttle control cable. I don't even seen any nipples or connections or holes where a PCV hose or valve should go. I thought it was on the passenger side, under the TB... but there is nothing here at all. I'm stumped.
I am beginning to think the truck just does not have one at all, which I know for a fact is impossible. I have traced every line on this motor from top to bottom, and I do not see it. Should have a heater on it I assume? What else can make the truck so rough? I don't buy it that "it's just that way". That is complete, lazy, BS. I have had/driven many trucks; 4x4s, supercrew, diesels, jeeps, dump trucks... I have NEVER had a truck run as badly and roughly as this one does. Heck, a twin-turbo 700HP diesel doesn't run this roughly.
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I have a 1999 F150 4x4 5.4, I pulled the heads due to blown head gasket. Prior to pulling heads truck started and run fine other than miss on #1 cylinder. I timed the engine according to Haynes manual and posts on this site. Truck is now hard to start and idles very rough. I does seem to smooth out when reving the engine and seems to have plenty of power. Cant find any vacuum leaks or unplugged wires.
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1995 Mazda Protege1.5 LAuto153K miles.
My car was running fine, then one day it started sputtering while driving, mostly when I accelerated. It stalled and I could not get it started. This happened on a day when it was raining hard, but not sure that had anything to do with it. A few days later when I went to pick the car up it started right up, it had stopped raining and been dry for 2 days prior. But about a mile into the drive back home it stalled and I could not get it started.
Here is what I have tested so far.
- Put in new fuel filter.
- Tested the fuel pressure and pressure regulator
- Tested the injectors with a noid light.
- Tested that the spark plugs were producing a spark.
After I pulled the plugs and cleaned and dried them (they were wet with gas) the car started, but I think not because of anything really related to the plugs. What I've noticed is that when cranking the engine if I give it gas it will not start but if I keep off the throttle it will reluctantly start. But once it starts the idle is smooth and as it should be. Then if I give it any gas it immediately stalls. It seems to me given these symptoms that it is getting enough air to idle but not enough air to match the increased gas.
The only CEL code that I'm getting (which I had before this issue occurred) is the "closed throttle position switch" (I forget the number). If it was an MAF, or IAC, or EGR issue would I not get a code? What this could be and how to test it. Again my guess is its an air intake issue but not sure where.
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