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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 2051
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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2007 Hyundai Accent 1.6 Showing codes PO340 Cam shaft

Customer Question

2007 Hyundai Accent 1.6 Showing codes PO340 Cam shaft sensor, PO016 Crankshaft sensor and code Po300 Misfire. Code Po340 I have changed the camshaft sensor weeks ago with a new one. Light has been on eversinse. Never went off. The other two codes poped
up today when I noticed the check engine light blinking. I checked the codes today when I arrived home. Car is running like trash. I know the misfire is ONE of the coil packs which I alredy changed three of them already. The other codes have me stumped. The
crankshaft sensor I changed last October 2014.
Submitted: 1 year ago.
Category: Hyundai
Expert:  Randall C replied 1 year ago.

Hello, Little confused, what codes have you stumped? can you explain how the engine is running right now>? anything else been tried? how many miles on the car?

Customer: replied 1 year ago.
The cam and crankshaft codes have me puzzled because they both have been replaced. 196,000. Rebuilt head and timing belt installed last October . Car has vibration at low speeds 10-30 mph then vibration goes away.
Expert:  Randall C replied 1 year ago.

I have my thoughts but do not like shooting guess at customers

I am going to opt out and open the post to the other experts

One should be along soon to pickup where we left off

Expert:  K. Wiggins replied 1 year ago.

Hello, do you have a volt/ohm meter to do some testing?

Customer: replied 1 year ago.
No sir
Expert:  K. Wiggins replied 1 year ago.

Thanks, I'll open this back up to see if any other experts can offer you their thoughts.

Expert:  Greg replied 1 year ago.

Hi.

If you clear all codes and do a test drive what codes come back .

What type of scan tool are you using .

Greg

Customer: replied 1 year ago.
I have not cleared out codes yet. I will do so after 8 pm on my way home from work. Is it ok to follow up with you then?
Expert:  Greg replied 1 year ago.

Yes . very importasnt you clear the codes .

The before starting the engine switch on ignition and check for codes , note what codes came then start the engine .check for codes Note codes , then do your drive home .

At home recheck for codes and note.

The please give me the codes in that order .

Clear codes

check codes Before starting .

check codes After starting .

check codes After the drive home .

Greg

Customer: replied 1 year ago.
Ok will do. Thanks
Customer: replied 1 year ago.
Just so I am clear with your direction before I leave work check codes before starting and check codes after starting . Then should I clear it out then drive home and check codes again when I arrive? Just double checking.
Expert:  Greg replied 1 year ago.

What ever you do don't clear it .

Greg

Expert:  Greg replied 1 year ago.

Clear codes

check codes Before starting .

check codes After starting .

check codes After the drive home .

Customer: replied 1 year ago.
Got it thanks a little tired . I work two full time jobs. Get back to you around 8:30
Expert:  Greg replied 1 year ago.

Okay i should be here if not first thing in the morning .

Greg

Customer: replied 1 year ago.
Ok......
Cleared codesZero codes now before starting.After start code p0340Got home code p0340.FYI- BEFORE I cleared codes they were P0340, P0016, and P0300.Also car has a misfire, RPM jumping while idling 800 to 1000. I don't know which cylinder yet. I have changed all but one coil pack. Camshaft sensor and crankshaft sensor have been replaced. Camshaft sensor 2 weeks ago. Thought that was defective so I put in the factory OE and still same code P0340.
Expert:  Greg replied 1 year ago.

How many miles on this engine and when was the timing belt last changed .

And last engine tune up like spark plugs .

Did you change the crank shaft sensor with an OEM or aftermarket if aftermarket go ahead and change this first

as this will set of the two code 340 and 016 .

Also go ahead and check the timing belt position a belt off one tooth will set of all three codes and make the engine miss.

Do this then let me know what you have .

Greg

Customer: replied 1 year ago.
I did timing belt at 165,000, and rebuilt the head. Belt snapped. Present miles 197,000. Did all this last October 2014. Changed cam and crank sensors complete tune up etc.So how do I know if the belt jumped a tooth?
Expert:  Greg replied 1 year ago.

Do a engine compression test .

Remove the timing belt cover, top part ,set the bottom crank pulley to "0" TDC.

then check the top cam mark is lined up .

When the belt snapped was any valve bent .

Greg