1993 Oldsmobile Bravada Engine will crank but won't start.

Tiny
JCSHIPKOWSKI
  • MEMBER
  • 1993 OLDSMOBILE BRAVADA
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 165,000 MILES
It happened all of the sudden. But before this I noticed that sometimes I would have to double start the truck sometimes, meaning I would have to turn the engine over twice. But it always fired up on the second try. One day I have absolutely nothing but an engine that turns over. So I went ahead and bought some new plugs and wires(since I knew I needed them anyway) and installed them. I checked for spark and I have spark. Next I changed the fuel filter. To no avail. So I figured sometimes when I turn the ignition, the fuel pump didnt always come on. I figured I should check the relay. I looked into it a little and found that the pump doesn't turn on every time you turn the key in succession, as it is a time issue before it needs to reprime the fuel line(or so I read). It sounded reasonable to me. So I moved on to the fuel pump.I replaced it and the fuel sending unit due to a fuel line connection giving me problems. I went to start the truck and my battery was dead. So I replaced that as well, and after all that am back in the same position. A truck that cranks but will not fire up. Any help would be GREATLY APPRECIATED. Thanks
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Thursday, October 15th, 2009 AT 8:28 AM

3 Replies

Tiny
JDL
  • EXPERT
Did you use a gage and check fuel pressure? Did you try running the pump from the prime connector? My info shows it is located underhood, firewall, close to center. Sometimes it is located close to relay, sometimes it isn't. Gray wire with electrical connector, nothing plugged into it. If you use jumper wire with inline fuse and run battery voltage to connector, the pump should run. You don't have to use the key. Because there shows to be an oil pressure switch in the fuel pump circuit, parallel circuit to the relay, once you crank it enough to bring up oil pressure and the switch closes, the pump should run, regardless of the relay.

Are there any codes? Right now, I'm not sure fuel is the problem? We can trouble shoot the relay circuits, if you want?
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Thursday, October 15th, 2009 AT 11:20 AM
Tiny
JCSHIPKOWSKI
  • MEMBER
I did more research. Literally wracking my brains. And started reading about low voltage to the fuel pump. Well since my battery is new I checked the voltage and it was very undercharged! So I simply charged the battery and whoosh my truck fired right up! In spight of this good news I really appreciate the quick response and look forward to using this site in the future! Thanks
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Thursday, October 15th, 2009 AT 3:48 PM
Tiny
JDL
  • EXPERT
Glad you got it going your way. Did you check the charging system?
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Thursday, October 15th, 2009 AT 4:04 PM

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