Technical PUNTO HGT Please tell me.

[toru]

私は日本でプントHGTを運転しています。
このスレッドの投稿を何度も読みましたが、最近、2000～2700rpmでエンジンを始動するとディーゼル音（ノッキング）が聞こえるようになりました。
これはバリエータが原因だと理解していますが、ソレノイドバルブを交換しても効果はないでしょうか?

また、次回のカムベルト交換までそのままにしておくとエンジンに悪影響があるでしょうか？

上記の件についてご教示下さい。

DeepL.com（無料版）で翻訳

 

[GrandePunto PL]

Why "replace" things right away? Slow down.
Do some basic maintenance first.
Fluids, filters, spark-plugs. Check emissions (exhaust gas analyzer) - besides compression, it also tells you the engine condition, health.
As for VVT system, check the solenoid valve, remove it and clean it.
Yes, VVT wheel ("variator") can be worn out (noise - clicking - is a most common symptom, but mostly at cold start, first 10-20 seconds).
If it's not timing/valves/VVT (or other stuff, exhaust leak, bad alternator or A/C), it's something more serious (pistons, rod/crankshaft bearings).
All above can make a noises at specific RPMs.

Search forum for similar threads.
https://www.fiatforum.com/threads/f...v-up-beyond-5k-rpm-cant-do-it-anymore.502507/
https://www.fiatforum.com/threads/how-a-phase-variator-works.101793/
https://home.hccnet.nl/jaap.bouma/PhaseVariator.htm

 

[toru]

Why "replace" things right away? Slow down.
Do some basic maintenance first.
Fluids, filters, spark-plugs. Check emissions (exhaust gas analyzer) - besides compression, it also tells you the engine condition, health.
As for VVT system, check the solenoid valve, remove it and clean it.
Yes, VVT wheel ("variator") can be worn out (noise - clicking - is a most common symptom, but mostly at cold start, first 10-20 seconds).
If it's not timing/valves/VVT (or other stuff, exhaust leak, bad alternator or A/C), it's something more serious (pistons, rod/crankshaft bearings).
All above can make a noises at specific RPMs.

Search forum for similar threads.
https://www.fiatforum.com/threads/f...v-up-beyond-5k-rpm-cant-do-it-anymore.502507/
https://www.fiatforum.com/threads/how-a-phase-variator-works.101793/
https://home.hccnet.nl/jaap.bouma/PhaseVariator.htm

Thank you for your prompt reply.
I have changed the oil, checked the spark plugs, and replaced the fuel pump. I also inspected the solenoid valve and found no problems with its function. The timing belt was replaced a year ago.
However, I still hear knocking noises while driving.

Thank you for the reference thread.
I will read it now.

 

[GrandePunto PL]

Problem seems to be common (VVT).
https://forums.overclockers.co.uk/threads/fiat-punto-hgt-issue.18240718/
https://www.fiatforum.com/threads/cant-beleave-it-engine-bad-knocking-sound.217073/
If it's not engine, maybe it is a gearbox noise?

 

[toru]

Problem seems to be common (VVT).
https://forums.overclockers.co.uk/threads/fiat-punto-hgt-issue.18240718/
https://www.fiatforum.com/threads/cant-beleave-it-engine-bad-knocking-sound.217073/
If it's not engine, maybe it is a gearbox noise?

Thank you for the information in this thread.
I will read through it and think about what measures to take...