Quote:
Originally Posted by CWXC70
Popping on the overrun and a lambda sensor over fuelling sounds much like air getting in the exhaust piping somewhere, are you certain you don't have any leaks in the home made exhaust system?
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It will only affect fuelling if there is an air leak between the engine and the sensor. Anything on the exhaust after the sensor has no effect. Which is why a missing cat won't be the issue as all the sensors I've seen have been either just after the manifold or just before the cat. As yours is a 93 it should be tested as having a cat, so I'm surprised that you don't have one.
Dave A