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2010 C180 CGI timing chain alignment faulty?

Old Nov 13, 2022 | 03:10 AM
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s204 CGI 2010
2010 C180 CGI timing chain alignment faulty?

Hello, I think I got one of the cam shaft sprockets not aligned after replacement. The engine feels like misfire and hesitates when throttling. The only code I get is P0172 too rich bank 1. Anyone any ideas? I have swapped around all coils and spark plugs, cam shaft position sensors. Exhaust cam angle is -109.9 at idle and intake is 109.84, what is normal at idle?
Ignition curve oscillating at idle from approx. -10 to 12 degrees, gets normal at 1500rpm and above.
Also replaced crank shaft position sensor with a new one.
I have now tested with four other ignition coils with same result. I am out of clue now.










Last edited by larmir; Nov 13, 2022 at 07:47 AM.
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Old Dec 5, 2022 | 02:44 PM
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s204 CGI 2010
Hi folks, I have now troobleshoot for one and half month.. I'm going ceazy soon...
I've replaced both oxygen sensors with same results, the issue is, rpm hesitates when throttling up, vibrates between apprx. 1100-2000rpm.
I'll get fault code P017222 mixture too lean, signal amplitude is greater than maximum amplitude and P017227 mixture too lean, signal change rate is above pemissable limit value on my Icarsoft CR PRO.

What I understand and know, all values and engine functions works as expected when I read the real time data on the scanner.

Please anyone who can help me?
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Old Dec 5, 2022 | 04:36 PM
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Originally Posted by larmir
Hi folks, I have now troobleshoot for one and half month.. I'm going ceazy soon...
I've replaced both oxygen sensors with same results, the issue is, rpm hesitates when throttling up, vibrates between apprx. 1100-2000rpm.
I'll get fault code P017222 mixture too lean, signal amplitude is greater than maximum amplitude and P017227 mixture too lean, signal change rate is above pemissable limit value on my Icarsoft CR PRO.

What I understand and know, all values and engine functions works as expected when I read the real time data on the scanner.

Please anyone who can help me?
The intake and exhaust camshafts look out of alignment. With the crankshaft at TDC, the arrow on the camshaft housing should align with the camshaft and the camshaft adjuster. I think you need to resolve this issue first before addressing any of the other fault codes.




Intake Camshaft



Exhaust Camshaft



Crankshaft @ TDC

Last edited by alynch; Dec 5, 2022 at 06:30 PM.
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Old Dec 6, 2022 | 03:46 PM
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s204 CGI 2010
Originally Posted by alynch
The intake and exhaust camshafts look out of alignment. With the crankshaft at TDC, the arrow on the camshaft housing should align with the camshaft and the camshaft adjuster. I think you need to resolve this issue first before addressing any of the other fault codes.




Intake Camshaft



Exhaust Camshaft



Crankshaft @ TDC
Thank you.
The cam angle values I read on the scanner shows -109. 9 and 109.8 respectively at idle, it is exactly same values I read on my friends car which is exactly the same model as mine.
Any thoughts?



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Old Dec 6, 2022 | 04:02 PM
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Originally Posted by larmir
Thank you.
The cam angle values I read on the scanner shows -109. 9 and 109.8 respectively at idle, it is exactly same values I read on my friends car which is exactly the same model as mine.
Any thoughts?
The ECM adjusts the timing as well as advancing/retarding the camshafts and assumes that all the components are in their correct mechanical positions relative to each other. If that's not the case, and the camshafts are not correctly aligned, then it's very possible the timing will be incorrect as as well. That would explain your lean conditions and the stumbling or misfiring.
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Old Dec 6, 2022 | 04:45 PM
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s204 CGI 2010
Originally Posted by alynch
The ECM adjusts the timing as well as advancing/retarding the camshafts and assumes that all the components are in their correct mechanical positions relative to each other. If that's not the case, and the camshafts are not correctly aligned, then it's very possible the timing will be incorrect as as well. That would explain your lean conditions and the stumbling or misfiring.
Thanks!
Is it possible to reuse the tensioner again? Possible to release the locking device?
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Old Dec 6, 2022 | 04:48 PM
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Originally Posted by larmir
Thanks!
Is it possible to reuse the tensioner again? Possible to release the locking device?
Yes, you can re-use the chain tensioner (ask me how I know). Here is a link to the reset process:

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Old Dec 14, 2022 | 03:40 PM
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s204 CGI 2010
Originally Posted by alynch
Yes, you can re-use the chain tensioner (ask me how I know). Here is a link to the reset process:

https://www.youtube.com/watch?v=aTjOPfvCbkY
Thanks for pushing me, moved both cams one tooth, works perfectly now.
Cam angles still show same values at idle, that cheated me.

Thanks!
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Old Dec 14, 2022 | 05:06 PM
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Originally Posted by larmir
Thanks for pushing me, moved both cams one tooth, works perfectly now.
Cam angles still show same values at idle, that cheated me.

Thanks!
Really glad it all worked out. I know it's a pain to have to go back in again, but sometimes there's no real choice.
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