Mechanics

ENGINE IS STALLING ONE DAY AND WONT START THE NEXT

1992 Pontiac Transport

My car cuts off when it wants to, one day it wont even start, the next it runs fine until you shut it back off then it wont start what is the problem? I have changed the spark plugs and wires, replaced the fuel pump, fuel sock, & fuel filter. I had the ignition module checked and it past. I have no idea what is wrong please help.
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Onnabug
October 11, 2011.




Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

http://www.2carpros.com/articles/car-cranks-but-wont-start

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-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, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

Tiny
Rasmataz
Oct 11, 2011.
Intermittent most difficult to diagnose need to determine what is lost fuel or spark. Next time wont start check for spark at plugs if good then spray carb cleaner in intake if it fires then fuel delivery problem
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Docfixit
Oct 11, 2011.

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