My dad's car, it would run fine when the engine is cold, but after maybe 5 miles and under load (going up to the elevated road and if I accelerate) I would sense light knocking from the engine, this knocking feeling would be more after 20 minutes of driving (approximately) when on the flat road and when I want to accelerate, I had to ease back on the gas paddle to avoid it.
It's been to a mechanic for this problem, they were not able to really find the cause and fix it (old car with older code system, they were busy fixing Mercedes and Bimmers. ), They eventually retard the ignition a bit, but the problem's still exists.
I have not noticed the temp. Gone up when the knocks happen.
It runs fine when the engine is cold.
Strange thing is the cooling fan would go on when I switch the ignition to ON (before I crank the engine) in the morning, there must be something wrong, but don't know what.
I have no knowledge of it's service history.
Tuesday, July 3rd, 2012 AT 3:34 AM