Mechanics

GMC SAFARI FUEL PUMP PROBLEM

2000 GMC Safari • 6 cylinder 2WD Automatic • 170,000 miles

Sometimes does not start when really cold or when moist air, have changed many parts plugs, wires, cap, rotor, coil, module, map senor, fuelfilter, tested tps sensor, top end gasket set, fuel pump, also surges when driving in said conditions. Any ideas would be great thanks for your time.
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Conradn
February 6, 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

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.

Rasmataz
Mar 13, 2011.


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