i have a 92 nissan 300zx non turbo. ive asked this question a few times on yahoo answers and the majority say the answer is a loose exhaust heat shield. but ive asked 2 mechanics and they said my cat converter may be going bad. ive started 2 hear a rattling sound under my car. it only happens in reverse or drive and when im not stepping on the gas pedal. my check engine light is not on. i havent noticed a loss in power. but my idle rpm was at about 1300 and then went up 2 2000. i put my idle control at the lowest setting and its at about 1200-1300 now. could it be my cat going bad? if so is it still in the early stages of going bad??
No when you hear the rattling its the beeds breaking loose in the converter.i just had thwe same thingon my dodge intreped it makes you loose power,but even worse it can put pressure on your engine that it does not need,this will wear your engine out alot quicker
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