need serious help

[91s13240sx]

I have recently started having problems with my 91 240sx. The car runs and idles fine as long as i have jumper cables hooked to anthour running car. However as soon as the jumper cable are dropped the car stutters and dies.

I have a new battery, checked all my ground leads and alternator cables fussible links.

I have noticed though one of my relays vibrates and makes a extremlly lound clicking sound its the EGI relay i have no idea what this is for and if its normal

[GamblerZ]

Is your battery the correct size? Do you have enough cold cranking amps (CCA)? Have you had your alternator checked? Are you drawing a lot of power for a monster stereo system?

I DO know that if the EGI relay is not working, the car will not start or run.

[yokotas13]

get a new alternator

[cmcdougle]

yeah, sounds like the alternator to me. Get a voltmeter, check the voltage of the battery with the car off, and then check it with the car running. Charge your battery overnight or something (make sure it is full of water), or borrow one. If the alternator is running, the voltage should stay the same or go up. If it isn't running, it will drop .1-.4 volts on average.

Let us know how it goes.

[cotbu]

EGI relay = ECU relay

[Walperstyle]

problem with mine was alternator

[91s13240sx]

i will check the ALT when i get home tonight is it normal for the EGI Relay to buzz and vibrate also even when i turn the key off the hicas, antilock, seatbelt light still stay on the battery is good because all the lights work fine and are bright the car wont start unless its hooked up with jumper cables

['90RPS13]

Alternator. Done. *a

[!Zar!]

It's your ALT. No need to worry about anything else.

[cotbu]

Alternator! And you need an new FSM

[ViZion Zs]

if he has a good battery in it then it should run untill it drains the charge, if i dies right away and stuttes do death then its something else. but sound from first glace to be alternator.

[Walperstyle]

be careful when checking the alternator. Sometimes they work, sometimes they dont. Could just be wires, or could be evil spirits.

Mine worked sometimes, but othertimes It would let me walk.