Engine Making Bad Rattling Noise

[Huon.cloutier]

Please help me troubleshoot a problem with my ol 400. Suddenly, it is making extreme rattling noises (is that what pinging sounds like) when under load. It is also idling really rough. It starts right up so obviously it has gas and spark. So is it the timing? Could it be the electronic ignition module. Could it be the vacuum advance on the distributor? Please give me some ideas on how to diagnose it.

[dervdave]

Please help me troubleshoot a problem with my ol 400. Suddenly, it is making extreme rattling noises (is that what pinging sounds like) when under load. It is also idling really rough. It starts right up so obviously it has gas and spark. So is it the timing? Could it be the electronic ignition module. Could it be the vacuum advance on the distributor? Please give me some ideas on how to diagnose it.

You`ve posted your query in the wrong section my friend :)