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.

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 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.

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)

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.

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.

You're welcome.

Good luck.

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)

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

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.