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Q: engine cranks over , and is firing , wont start. on 1993 Nissan 240SX

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I'M having problems with my 93 nissan 240sx , it will crank when it sits overnight , but after you start it , and cut it off for a few minutes it wont crank back until it seats along period of time , but when it doesn't start it still is firing , has good fuel pressure , and when it wont start I even sprayed some starter fluid into the chamber , and it still doesn't crank .
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I'd look into the ignition system. If it won't fire when you spray starting fluid into the intake and crank it, then I think you have ignition problems.
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I absolutely dont know the answer to this one but I do know how to get it started. I bought a 1989 Nissan 240 sx stick on December 26 1988 brand new when they first came out. I still own it. After about 4 or 5 years I started having this exact same problem. And I hate to tell you I still have the problem 20 years later. I've had more than a dozen mechanics including 3 Nissan dealers work on my car over that time and not one could ever solve the problem. My idiot alcoholic ex mechanic brother had the solution. It's not a fix but it will start the vehicle. You press the gas pedal all the way to the floor. Then you turn the key CONTINUALLY keeping it turning over for about 15 seconds straight. It should sputter to life and kick out a little black smoke but smooth out to normal if you rev it after a few seconds. Remember Gas pedal flat to the floor and CONTINUALLY crank the car for about 15 seconds straight. And by any chance you do find out what this problem is and how to fix it email me the answer please.
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