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

[vtl]

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 !

9:1

Life would be hundred times easier if you install VIDA and get J2534-compatible code reader like DiCE.

[dikidera]

Ahem, the compression of a healthy B5244S/S2/SG/S6 engine should be 180 psi at least. Those are naturally aspirated, for turbo I'd imagine slightly lower than this. The most important thing is to check for evenness in compression, you don't want to see more than 5% difference between any cylinder.

[adblock]

Ahem, the compression of a healthy B5244S/S2/SG/S6 engine should be 180 psi at least. Those are naturally aspirated, for turbo I'd imagine slightly lower than this. The most important thing is to check for evenness in compression, you don't want to see more than 5% difference between any cylinder.

I'm keeping my fingers crossed that there's not too much damage.

[adblock]

Hey everyone !!


I do my compression test

4 cyl : 125 kPa With no leak
The first cylinder from the left has 100 kPa No leak

I changed the vvt sensor which has been the same since 2001, with the new one which replaces the one after Volvo The explosions are fewer and less strong but still present

By any chance there is no need for software configuration for this vvt sensor?

I will do the camshaft timing next week! If you have any other ideas, I'll try everything!

Thanks !

[jonesg]

the compression numbers are not great, if the compression is leaking through exhaust valve then it might burn the valve, it might be carboned up. i cleaned an engine with seafoam, let it sit 2 hrs, then cranked over to expel the gunk, then added seafoam to the gas tank, it smoked a bit but cleaned the combustion chamber. seafoam dissolved the carbon.

but the running problem might be a completely different problem.

[adblock]

the compression numbers are not great, if the compression is leaking through exhaust valve then it might burn the valve, it might be carboned up. i cleaned an engine with seafoam, let it sit 2 hrs, then cranked over to expel the gunk, then added seafoam to the gas tank, it smoked a bit but cleaned the combustion chamber. seafoam dissolved the carbon.

but the running problem might be a completely different problem.

What do you mean no good? Because there is no leak ... and all have the same value except one, that said it is well carbonized inside I will clean it all.

Thanks a lot ! Other ideas about the problem

[jonesg]

a leakdown test can be done, listen to the exhaust side for leaking exhaust valves, or the compression might be leaking past the piston rings.
the loss of compression is going somewhere. or have a mechanic do the test for you, then he can explain possible repairs.

[vtl]

I think you are one decimal number off. 1 BAR (100 kPa) is actually almost no compression.

No need for sw update for new VVT.

Check your timing ASAP.

[dikidera]

Even 125kpa is no compression. Even as 125 psi it's still too low.