ECM-644A Timing belt problem or poorly adjusted valve problem

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Hello everyone, I hope you are well

I have a Volvo v70 Xc 2.4t from 2001 With 309,000 km, I recently had my throttle body repaired (no more error codes), change my spark plugs, check the harnesses Check the fuel circuit, change the camshaft sensor, check the reset valve but everything is fine.. only when I start Really powerful explosions in the engine, unstable idling, and often stalls

I still have one error code among all the others repaired, the famous ECm-644A

Ecm-644A : camshaft contrôl faulty position ..
You will surely tell me these solutions:

Camshaft belt has jumped out of place on the cogs. [[[[HOW TO TEST/ REPAIR THIS ]]]]

Defective reset valve. [[[ I just did a continuity test on the two pins and it works, I conclude that it is functional, I cleaned it anyway]]]].

Mechanical fault in the Variable valve timing (VVT) unit. [[[[HOW TO TEST/ REPAIR THIS ]]]]


Here is a video, be careful, sensitive soul

Snapchat-1664225355.mp4

(28.3 MiB) Downloaded 427 times

Outside

2023-11-12-101230399.mp4

(8.31 MiB) Downloaded 374 times

Inside

Thanks you !! <3

[dikidera]

Step 1 unplug the VVT solenoid connector and see if it still idles badly.

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Hello everyone ! How are you ?

Step 1 unplug the VVT solenoid connector and see if it still idles badly.

Step one done Please note that I am not accelerating in the videos, only started

When i unplug and try angain The engine blows, no huge explosions or none at all
Hère vidéo whitout VTT

VID_20231118_122406.mp4

(58.58 MiB) Downloaded 386 times

When I plug it back in and try again the explosions are back
Vidéo :

VID_20231118_123318.mp4

(30.88 MiB) Downloaded 338 times

What did you think?

[ignatz]

Check the compression before you spend too much time on this. Make sure your working on a good engine.

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Check the compression before you spend too much time on this. Make sure your working on a good engine.

I'm going to do the compression test. The owner who sold me the car did a complete rebuild of the engine at Volvo before it broke down again.

Thanks for the advice my friend!

[vtl]

When i unplug and try angain The engine blows, no huge explosions or none at all
Hère vidéo whitout VTT
VID_20231118_122406.mp4

It is misfiring.

When I plug it back in and try again the explosions are back
Vidéo :

VID_20231118_123318.mp4
What did you think?

Here it is back fires. Probably belt skipped a tooth or two. Could be VVT hub set incorrectly.

Get a timing alignment tool like this https://www.ebay.com/itm/202578850015 (I would advise to supply your own high grade bolts - these Chinese ones are way too easy to snap inside the camshaft). Lock the camshafts. Lock the crankshaft (need to remove the starter to access whole for the lock). Set it right. Remove the locks, rotate the crankshaft 4-10 times and recheck everything. 2 crankshaft rotations equals to 1 camshaft rotation.

Compression test would not hurt. If the valves hit the pistons even lightly they could be bent and leak air.

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When i unplug and try angain The engine blows, no huge explosions or none at all
Hère vidéo whitout VTT
VID_20231118_122406.mp4

It is misfiring.

When I plug it back in and try again the explosions are back
Vidéo :

VID_20231118_123318.mp4
What did you think?

Here it is back fires. Probably belt skipped a tooth or two. Could be VVT hub set incorrectly.

Get a timing alignment tool like this https://www.ebay.com/itm/202578850015 (I would advise to supply your own high grade bolts - these Chinese ones are way too easy to snap inside the camshaft). Lock the camshafts. Lock the crankshaft (need to remove the starter to access whole for the lock). Set it right. Remove the locks, rotate the crankshaft 4-10 times and recheck everything. 2 crankshaft rotations equals to 1 camshaft rotation.

Compression test would not hurt. If the valves hit the pistons even lightly they could be bent and leak air.

Thank you very much I'll do that ... do you have a video or photos? a more precise tutorial?

Because if I do not understand how to correctly put the alignment, it is done by itself as I turn the crankshaft ?

[vtl]

That one is accurate:

[dikidera]

When i unplug and try angain The engine blows, no huge explosions or none at all
Hère vidéo whitout VTT
VID_20231118_122406.mp4

It is misfiring.

When I plug it back in and try again the explosions are back
Vidéo :

VID_20231118_123318.mp4
What did you think?

Here it is back fires. Probably belt skipped a tooth or two. Could be VVT hub set incorrectly.

Get a timing alignment tool like this https://www.ebay.com/itm/202578850015 (I would advise to supply your own high grade bolts - these Chinese ones are way too easy to snap inside the camshaft). Lock the camshafts. Lock the crankshaft (need to remove the starter to access whole for the lock). Set it right. Remove the locks, rotate the crankshaft 4-10 times and recheck everything. 2 crankshaft rotations equals to 1 camshaft rotation.

Compression test would not hurt. If the valves hit the pistons even lightly they could be bent and leak air.

I have the same chinesium one and had to put two washers on each camshaft bolt as they were too long! But also, the tool that locks both camshafts together doesn't quite fit right, the allen key screw strips the threads a bit. I mean I still managed to set the timing correctly, but the video is kind of misleading, the markings don't matter at all, only whatever the tool shows.

However! It's still very easy to mistakenly put the camshafts 180 degrees out of phase of each other even with the crank and cam locking tool and even torque down the cover just like that.

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Thank you friends!


It makes me happy to receive help from a community based all over the world
Does anyone have repair documentation? It would be to know the compression values ​​🫣

I'll keep you informed !