tezzasaurusrex
Senior Member
- Thread starter
- #1
Hi all,
So I've noticed a knocking/tapping type noise thats emitted from what I assume to be the engine when it is held at around 1500-2000rpm. It almost sounds like a diesel type oscillation/knock. Can nearly even liken it to piston slap. It seems to smoothen out and disappear above 2000rpm where perhaps the natural noise of the engine overtakes the magnitude of the noise emited from the knock.
I've already pulled the rocker cover off to check and adjust valve clearances which made no difference (although it might be worth noting that all 8 valves on the exhaust side was quite loose) - also tried using a slightly thicker oil (0W30) which made no difference.
The noise starts to occur when the vehicle is up to operating temp - on a cold start its not audible at all. It is however very audible on a warm start when the ECU holds idle at 1500rpm for 10-15 seconds. And once the engine is up to operating temp it is always repeatable and audible at those rpm's especially with the windows closed in a quiet environment.
I've tried it on two other FL5's and I've found both vehicles also produce this same noise at the same RPM so I assume it is a characteristic of the engine rather than a fault. But I would like to know if anyone has experienced this and perhaps know what's actually causing it?
Video of the subject noise:
So I've noticed a knocking/tapping type noise thats emitted from what I assume to be the engine when it is held at around 1500-2000rpm. It almost sounds like a diesel type oscillation/knock. Can nearly even liken it to piston slap. It seems to smoothen out and disappear above 2000rpm where perhaps the natural noise of the engine overtakes the magnitude of the noise emited from the knock.
I've already pulled the rocker cover off to check and adjust valve clearances which made no difference (although it might be worth noting that all 8 valves on the exhaust side was quite loose) - also tried using a slightly thicker oil (0W30) which made no difference.
The noise starts to occur when the vehicle is up to operating temp - on a cold start its not audible at all. It is however very audible on a warm start when the ECU holds idle at 1500rpm for 10-15 seconds. And once the engine is up to operating temp it is always repeatable and audible at those rpm's especially with the windows closed in a quiet environment.
I've tried it on two other FL5's and I've found both vehicles also produce this same noise at the same RPM so I assume it is a characteristic of the engine rather than a fault. But I would like to know if anyone has experienced this and perhaps know what's actually causing it?
Video of the subject noise:
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