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Come on z-car wizards, answer this for me. 1984 300 zx , auto , dig.,starts right up , runs for about 30 to 45 seconds, idle slows, engine stops. Will start right back up and do the same. Can drive down highway at 60 miles per hour for about 30 seconds, engine quits, touch key to start position, car continues on without slowing down. This continues indefinitely or until you stop engine. Someone give me some ideas please. Thanks, Murphy
 

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Re: runs great, quits after 30-45 seconds,immediately starts rig

Sounds like fuel pump low-voltage control through the ECU is open circuit somehwere.
 

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Re: runs great, quits after 30-45 seconds,immediately starts rig

hook up a fuel pressure gauge , see if the fuel pressure goes away as it idles down.
 

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Re: runs great, quits after 30-45 seconds,immediately starts rig

I had the same problem exactly with my 84 N/A and it turned out to be a bad computer go to your local junkyard and get one out of an 84 thru a 90 non turbo if thats what you got and try that. it should work like new
 
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