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Discussion Starter · #1 ·
This began happening the day after my tune. I had gotten my h22 tuned with hondata as well as with bigger fuel injectors (RC 370cc). I am not sure why the thumping started happening but it is very noticeable especially during cold starts.
Here is what it sounds like with the thumping:
Here is what it sounds like normally:
That thumping noise is worrying me and its the first time the engine is doing this. I am going to try to get a valve adjustment tomorrow and hopefully get the timing belt tensioner inspected as well. But does anyone know from experience what it could be exactly?
 
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