Question about 1997 GMC Sierra

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1997 gmc sierra 5.7L. Engine will turn over, but won't start. It has spark and fuel, at least to the throttle body. i've replaced the fuel pump 5 or 6 times in the last three years. it'll run fine, usually, for 3 months to a year. fuel supply doesn't seem to be the problem. it might be coincidence. but it seems to be able to start whenever i do anything that relieves the fuel pressure in the system.

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6ya6ya
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BuzzFlewhart
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SOURCE: 2004 GMC Sierra Computer reset ??

I would suggest stopping by an AutoZOne or O'Reilly's and "borrow" their Scan Tool to erase any codes.
TO reset the "Change Oil" light, turn the ignition to ON (do NOT start the car). Press the accelerator pedal all the way down (then release) to the floor 3 times in less than 5 seconds. Change Oil light should flash then go off. If not, try it again. The trick is to get this done in 5 seconds ro less.

Posted on Apr 01, 2010

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  • 182 Answers

SOURCE: 1996 GMC Sierra 1500 truck fuel problem

Have you check the injector relay or maybe a fuse for injectors.

Posted on Aug 27, 2008

hotrodtod38
  • 141 Answers

SOURCE: 1998 GMC Sierra won't fire and run

INJECTOR MAYBE?

Posted on Feb 13, 2009

jagjeffery
  • 318 Answers

SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

GM Elec
  • 1000 Answers

SOURCE: I have a 99 suburban that has 203,000 miles. It

I believe you have a fuel regulator weak or dirty injectors.
Try turning the key to the "on" position ( do not try and start) wait until fuel pump stops running (3-5 seconds or so ), turn the key off and immediatly repeat for 3 cycles. On the 4th key rotation, start the vehicle. Does it seem to start up faster?
If so, the regulator is weak, however, the fuel pump does have a check valve in it to prevent fuel from leaking back into the pump and maintain line pressure.
Try the diagnostic proceedure above first and we can go from there.
Good luck, let me know.
Regards,

Posted on Jul 15, 2009

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But more likely fuel preshure is douwn! check your fuel pump for preshure, once started the engine can live with that for a time I think you will find it is that!
Pleased to be of help.........Bruce

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