1991 Nissan 300ZX Logo
h
hamid Posted on Mar 11, 2014
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300zx rpm problem

There is a problem when I go up to 4000rpm it jumps and goes back to 3000rpm I dont know why. Can anyone please help!

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Clif

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The engine rpm originates from the crank angle position sensor. it is located on the left head front side. These cars have problems with harness connectors becoming corroded. I would start there.

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Check throttle position sensor and throttle body

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Anonymous

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  • Posted on Aug 21, 2008

SOURCE: my 300zx

Wow it could be a couple of things, First do you have MAP, throttle position, sensors? After it back fires do you smell anything, gas, rotten eggs? Is your check engine light comes on when the car dose start? and how was the car running just before this? or was it one day you jumped in her it no start? Right now I don't think its your fuel pump, need to get more info. I can give you how to check the fuel pump later.

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