Clicking sound dependent on acceleration, EF Sedan
have a clicking sound under the hood like a bike chain clicking which is proportional to how hard I press the accelerator, and is independent of whether I'm in neutral, reverse or drive. In idle it clicks about twice a second, and when I rev it up it gets up to many times a second. Occasionally it will 'miss' a click. It happens in all gears and on both LPG or petrol. The sound seems to be coming from the engine block. The car (Ex-cab EF) seems to be driving fine and at full power. I looked up similar posts on this website and on the net. Can anyone please suggest which might be most likely or any other possible causes?
Possible causes and solutions:
- Spray pulleys, belts with WD40 - done, no difference
- Gudgeon pins - I couldn't work out where these were using my manual, given where the sound is coming from and its characteristics is this likely?
- Check drive shaft - did this, sound doesn't seem to be coming from it
- Charcoal cannister on passenger side might be touching body work - couldn't find this but it didn't seem like the sound was coming from that side anyway
- Engine mount flexing causing sound - the engine is very stable and sound did not seem to change at all when I supported it or tried to suppress movement.
- Check idle solenoid - seemed to be working alright, although I didn't
have time yet for a thorough check - is this a possible cause?\
- Try engine oil flush and then thrash the car - just had a comprehensive service and the engine oil is full and seems clean.
- Other possible causes - timing chain, internal engine part?
Thanks for reading,