Question about 1992 Nissan 300ZX

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Surge in idle when brakes applied or after driving..

I have a 92 300zx NA, when driving the ca and come to a stop, the idle will surge between 500-1500 rpms, this will then stop after a little less than a min then start to idle above 1000 rpms. Sometimes it will idle just fine after its spaz. I also noticed last night that if I pump the brakes when the car is staopped, it does exactly the same thing. There is a smell of fuel in the engine bay and it sounds like it is missing out the tail pipe. Any ideas?

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  • Nissan Master
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Block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

Posted on Jun 15, 2009

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