2003 Honda Accord P0341

Thanks Tyler...as to the camshaft sensor, the topmost pix is intake side (bank1?) and lower the exhaust (bank2)...wondering which is a normal. Also I think I should post steps on uploading waveform from PICO files...

Hey robert! I moved this into it's own thread, FYI. Wanted to keep this easily searchable for others later.

I marked up your original waveform with the intake/exhaust labels for my own benefit:



After you let me know which was which, I started to make sense of it. Here's a known good I grabbed:



The yellow in this capture is the intake, and green is the exhaust. You can see how the valley of the intake pulse is intersected by the downswing of the exhaust pulse. The intake and exhaust pulses on your capture never seem to line up, ever.

Are there any running issues on this engine, or any other codes? I think it'd be useful to look at both the CMP signals with the CKP as well, to determine if one or both are out of time.

Tyler...sorry for the late reply. The car is running smoothly except for the DTC PO341. Capture I made was not at the same time. They were seperately probed; unfortunately the owner had to rush and drove his car for an important appointment that is why I did do any other test. Have not heard fro him though. But if he does, yes I would like to do a test with the CKP and CMP at the same time...i will update you.

I would love to be able to look at those waveforms and tell you what your problem is but I am not well versed enough. I can tell you from experience that when you have this trouble code- and the engine runs fine.... whether or not it sets on cranking or 10 miles down the road- your cam chain is beat. Pop the vc- put it up on tdc- and you will see the cam marks look like this : ____

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robert.lesaca wrote: Tyler...sorry for the late reply. The car is running smoothly except for the DTC PO341. Capture I made was not at the same time. They were seperately probed; unfortunately the owner had to rush and drove his car for an important appointment that is why I did do any other test. Have not heard fro him though. But if he does, yes I would like to do a test with the CKP and CMP at the same time...i will update you.

Oh OK, gotcha. Like fudgie mentioned, if the engine is running well, then it is likely to be a chain slack problem. How many miles on this Accord?

Hello Tyler and Fudgie...just an update. I advised owner to have his timing chain checked by the mechanic who recommended this car to me (I suspect a loose chain). By far mechanic has not scheduled when to check the chain. But as soon as he does some checking and reacement, I will scope both Intake and Exhaust and compare the waveform with Tylers...thanks again.

Thanks for the update! Much appreciated.

So far, the car is still running fine. But I suspect timing chain slack and I advise the owner to have my mechanic friend check for timing chain slack, and if indeed there is looseness, then replacement and timing mark adjustment, etc will have to be done. I will update on this issues as it develops...