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General Car Chat / Thoughts on engine knock
« on: 12 March 2016, 17:05:40 »
Well since this is not an urgent matter rather thoughts exchange I think this is the right place.
Well my '94 saloon has developed an engine knock But there are some funny facts about it.
-it lasts for the past 3 and a half years since I bought it and it was present while I was considering buying it
- or 4000 miles (more than 5 000 km)
-it does not happen when the engine is below operating temp
- it does happen ONLY in between 2.500 and 3.000 revolutions
-I can rev it in red line and not a sound but when the revs rise past 2.500 rpm there is sort of very distant, very muffled metal to metal sound, like hammer to nail sound it sounds like it is not up here but down there, if you know what I mean
-other than that there is nothing wrong with it
-when I give it some quick slam on the gas pedal there is no knock. Only when I rev it slowly
So, what do you think?
Well my '94 saloon has developed an engine knock But there are some funny facts about it.
-it lasts for the past 3 and a half years since I bought it and it was present while I was considering buying it
- or 4000 miles (more than 5 000 km)
-it does not happen when the engine is below operating temp
- it does happen ONLY in between 2.500 and 3.000 revolutions
-I can rev it in red line and not a sound but when the revs rise past 2.500 rpm there is sort of very distant, very muffled metal to metal sound, like hammer to nail sound it sounds like it is not up here but down there, if you know what I mean
-other than that there is nothing wrong with it
-when I give it some quick slam on the gas pedal there is no knock. Only when I rev it slowly
So, what do you think?