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just cleared OBD O2 sensor and spark plugs now the engine clunks as if something is wrong


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Just cleared OBD for O2 sensors, replaced all four.  Now no error codes, however, loud intermittent/sporadic clunk sound and seems to come from exhaust manifold or cat.  Also, no improvement on engine performance.  Still idles rough when cold. 

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Roger that.

2000 Boxster, 986, 2.7L.  The O2 sensors were replaced following error codes P1128 and P1130. 

Now no error codes.  However, about 5 seconds after starting up the engine idle deteriorates and runs poorly, rough and at low rpm.  Also, an intermittent clank/knock sound eminating from the muffler.  Peculiar.

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18 minutes ago, Todd M said:

Roger that.

2000 Boxster, 986, 2.7L.  The O2 sensors were replaced following error codes P1128 and P1130. 

Now no error codes.  However, about 5 seconds after starting up the engine idle deteriorates and runs poorly, rough and at low rpm.  Also, an intermittent clank/knock sound eminating from the muffler.  Peculiar.

 

You sure the sound isn't coming from the three way cat?

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