Starting problem

Tiny
JLUKE
  • MEMBER
  • 1 POST
  • 1999 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 207,000 MILES
My 99 safari will start w/ starter fluid, then idle no problem. When given any gas dies. Before doing this it ran great the one day backfired and died due to cap going bad ( has been replaced ). After that day will not start except with the starter fluid.

Thanks for any help
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Tuesday, August 27th, 2019 AT 1:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you hear the fuel pump come on when you turn key to run?-If so check the fuel pressure if its within specs if okay test the coolant temperature sensor and fuel pump and oil pressure sending unit-
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Tuesday, August 27th, 2019 AT 1:05 PM (Merged)
Tiny
RMUZIO
  • MEMBER
  • 2 POSTS
  • 1999 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Engine turns but will not start
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Tuesday, August 27th, 2019 AT 1:05 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Cranks but no start condition:

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 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 so, 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, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
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Tuesday, August 27th, 2019 AT 1:05 PM (Merged)
Tiny
BILL GILSTRAP
  • MEMBER
  • 1 POST
  • 1999 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I have a 1999gmc sarfari 4.3 that will not start if it is raining starts fine runs good when it is not raining. Will crank but will not fire. Have replaced dist cap, rotor, ign module, spark plugs. By the time I get parts put it starts getting fire to plugs and starts. Dont know where to go from here.
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Tuesday, August 27th, 2019 AT 1:06 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
By the time I get parts put it starts getting fire to plugs

If you're getting spark-check if its getting the correct fuel pressure and injectors are pulsing-
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Tuesday, August 27th, 2019 AT 1:06 PM (Merged)

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