Camshaft timing

There are marks on the camshaft and crankshaft pulleys for you to note while installing the belt. Attached diagram gives and idea what it is about.

https://www.2carpros.com/articles/how-a-timing-belt-works

https://www.2carpros.com/questions/how-to-set-timing-of-timing-belt-after-rebuilding-heads

The above two links should be helpful to you.

Warranty problem
2006 Hyundai Sonata 4 cyl Automatic 70000 miles

Is the cam position timing valve part of the powertrain? I'm told I need mine replaced, what will happen if i dont

It is a sensor that detects camshaft position. Your ECM uses the the voltage to recognize ignition timing and proper fuel injector delivery, among other things. Failure to replace (if needed) will affect the fuel efficiency, and possible no-start condition, Here are the timing belts marks so you can check to see what's going on.

https://www.2carpros.com/diagrams/hyundai/sonata/2005

Please let us know what happens.

I think the code was P0011

I hope you have not replaced the cam sensor just yet. I was doing some research for P0011, it has something to do with Continuously Variable Valve Timing. My computer couldn't process and print Mitchell's descriptions. The entire document is like 50 pages long and it keeps crashing my computer. So I have the next best thing. If you may notice, the info comes from Kia, but you may or may not know, Kia and Hyundai are essentially the same vehicle. I cannot post pdf file in the forum. If you wish, send me your email and I will forward the information to you. Just click my email link and use the same forum title for the message, so I know it is from you.

I bought the car from a Hyundai dealer @ 66K, Do i need to change the timing belt again and if so @ what milage? am i overdue @ 117K?

it all depends, you should replace your timing belt around every 60,000 if it was replaced when you bought it, then, your coming up on your next interval. if it was never replaced, then your way overdue, although, I've seen people with vehicles well over 130,000 miles and have never changed their belt,(bad move though)

Engine Performance problem 2004 Hyundai Sonata 4 cyl Automatic 3 months ago when i attempted to start my car it wouldn't turn over. I then had it towed to a local mechanic shop where I was told the timing belt needed to be changed luckily it didn't damage anything. After about 3 months of driving the car the car stalled after driving it down the street doing the same thing as before. I then took the car back to the same mechanic shop thinking the timing belt broke again but the mech. said no it wasn't the timing belt it was 8 bent valves after giving him go-ahead he said he'd fixed the problem only for the car to stall again after only driving about 10 miles with the same exact problem. now he's saying that it could be the wire harness and he has to disconnect five fueses and if that doesn't work it could be the main sensor box. does any of make any sense to you? I keep asking the million$ question what could have cause the valves to bent he's not giving me a straight answer. PLEASE HELP I'M DESS

PERED AND I HAVEN'T SEEN MY CAR IN 3 WEEKS!!!

Hi leniepooh1,


The only possible reasons for the valves to be bent would be improper installation of the timing belts. this would result in the pistons hitting the valves causing them to bent.

Here are the timing belt marks so you can double check them

https://www.2carpros.com/diagrams/hyundai/sonata/2004

Let the mechanic knows that the problem is his to handle. There is a possibility he is not versed in this engine and the tension of the timing belt was not correctly adjusted. This can cause the timing belt to skip and cause the damage.

Yesterday, I replaced timing belt (big and small) along with pulleys.
Once everything was put back together the car ran like a dream for about 15 minutes then started making noise again. I pulled the top timing belt cover off and found that the belt is slipping off the pulleys and eating into the covers. The tensioner seemed fine when we took it out but now im not so sure.
My question is.. Is the tensioner what holds the belt in place and keeps it from sliding or am I missing something?
Thanks!

Check the tensioner bearing installation. If it is not installed correctly, it can go out of alignment causing the symptoms described. Next check all other pulleys/sprockets. Any that are out of alignment would cause that.

The final thing to check would be the plate between the 2 crank sprockets. Ensure it is not reversedly installed. Its purpose is to act as a wedge like support to hold the timing belt in position.

Thank you very much. I will check these today.

You're welcome.

Good luck.

I bought this car at 85,000 miles. in the manual they mentioned that the belt should be changed at 60,000 Now I do not know if it was changed or not. The car now has 90,000 and belt should be changed at 120,000 according to manual . Since I do not know if it was changed before can anyone tell me how can I diagnosis the belt worthiness or it need a change?

If you do not know if it has been changed at that mileage, change it ASAP. There is no reliable way to tell if the belt is good or not by just looking at it. The belt could look like it is new and shred itself the next time you start the engine. That is why the mileage interval exists. That is a simple safe number to use. In your case if that belt has not been changed you are on borrowed time. If you changed it today, you would not change it again at 120,000, you would go to 150,000 as that is 60,000 miles after it was changed.


My policy on buying a used car is simple, unless the seller can show me that the major service items have been done at the proper times, I do them all ASAP, that way I have a baseline to start from. The one we just bought is in my shop at the moment, I am changing all fluids, replacing anything that should have been done prior to the 60,000 it has on it. Then I will start the clock to change them at whatever mileage/time the book says for severe driving. (other than oil/filter, it has VVT so it will get changed a bit more often to keep that happy)

I take out the timing belt cover looked for old marks which shows the the belt was changed since it only has 90 k and it should be changed at 60 k. the seems fair and good there were indications the it has been changed so I am good until 120 k

What marks did you look at? The lettering on the belt itself or ?

While we change the timing belt we mark the position of timing right? Those mark and timing belts look good

Some people do some don't. If you found marks that show it was changed then great.

What I normally do is write the mileage and date inside the timing cover with a lime green paint marker. Or I will engrave a sprocket in the case of a timing chain.

When I change it I will definitely keep that in mind. Thanks you so much.

No problem. Thank you for using 2CarPros. Please return with any automotive questions.

i replaced belt,i need information on timing marks.

I do not know which engine you have so here are 2 diagrams.

For 2.4, there is an additional balancer belt which has to be timed correctly.

i put a new timing belt and related parts in my 2004 sonata 2.4l motor, it starts but has a fludder sound with no power. i could not remove plug on side of motor. so i could not check the balance shaft position, however i did not remove the sprocket.does this still have to be done,

You should ensure that balance shaft timing is correct and re check valve timing, was the belt changed for what reason, if it failed or you turned the engine with the belt off, you will have bent valves as it is an interferance engine.

Dealer recommends replacing timing belt becuase of transmission damange if belt breaks. Is this a manufacture problem/defect.

Hi there,

You will not damage the transmission, but you will have valve damage in the cylinder head. This is a standard replacement item which should be replaced when the manufacture recommends, there Will be no warranty claim on damage if a belt brakes so i would recommend that you have it changed if it is due.

mark (mhpautos)