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ST184R - 5S-FE Noises. What to do?


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Hi all, Got a '93 WRC Trophy ST184R and the engine as just started making some pretty bad sounds.

Here's the symptoms:

  • Sound only happens when engine is hot.
  • When warming up the engine, sound will be only present above 4,000RPM.
  • When engine is hot, Sound will be present all the way down to 1,200RPM.
  • Sound only present when there is combustion in Cylinder 1. (Disconnecting the spark lead stops the sound)

See Video:
This video shows the engine after warm up, I rev the motor and disconnect/reconnect Spark Lead 1. - the sound only occurs when lead connected to cylinder 1.

Help in diagnosis is requested.

So far, a mechanic looked at it for 2 seconds, pulled the lead and said "It's the Piston"
Another person has said "Engine is totaled"
and another recons there's something wrong with the spark lead or injector (I don't see how)

Extra Info:
No Exhaust Smoke.
Radiator is Green and Clean.
Oil is good, Replaced 5,000km ago has no signs of metal filings.
Car has done 359,000KM and has always been serviced on time.

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