Well for the USA version of the 1.4 motor, we have temporarily agreed that the motor does not have a DV. But based on a standard turbo system if the DV is not set correctly, too much boost will rupture everything.
Thanks for your reply.
Why i asked this question becoz one yr before, i hv changed my dv (noisy sound) and walked for 5 to 10km for testing.
It is fine and smooth. One day later, i took out one spark plug to check and put it back without doing anything.
However after i run for 2km, the engine light is flashing. Engine was shaking.
Finally, the error code showed that 1,2,4 misfire. And i hv to change the whole engine.
Thats why i am not sure the dv or the spark plug damage the engine
I found two shops to checked my car
Both of them said the engine valve problems
Rebuild engine or change whole engine
They have test the coils and they were fine.
Here are the error codes at that time
P0037
P0030
P0300
P0301
P0304
P0302
P2004
P0036
P0031
P0303
So based on that link, it sounds like you had burnt valves. So we can possibly say that the low quality DV cause an issue with the boost which caused the poor air/fuel mixture resulting in burnt valves. I may be wrong but this is kind of what I am gathering from this site.
The dv can damage the engine for 10km.
Horrible....
But we never know how to choose a good dv
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