1994 Infiniti Q45 shuts off while driving,wait and restart

1994 INFINITI Q45
154,000 MILES • V8 • 2WD • AUTOMATIC
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JOEYRAD
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  • 1 POST
car starts and runs for around 10 to 15 miles and shuts off.will wait a few minutes and restart car will run for another 10 to 15 miles,have changed computer to no avail.
Jan 20, 2010 at 11:08 PM
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RASMATAZ
  • CERTIFIED EXPERT
  • 75,992 POSTS
Next time it happens do not wait for nothing ,do below immediately to determine if it's a fuel or spark problem.

Get a starting fluid/ether/better off gas in a spray bottle and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 in away from ground have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor /distributor pick-up coil, ignition control module, ECM,Ignitor camshaft and crankshaft sensors- Note: If it doesn't apply disregard it
Jan 20, 2010 at 11:29 PM