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1998 Chevy Silverado won't start

Tiny
EASTMACC
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 95,000 MILES
This is my first time submitting a question so I'm not sure of the proper etiquette but here is my issue. I have a 98 silverado 5.7 k1500 csfi. I lost power while on the highway, got home, turned the truck off and then started it, worked just fine revved it up no issue. Did this twice. Next day won't start, turns over won't kick. I have replaced the starter, plugs, ICM, fuel filter. Not working. Got it to start once after replaced filter, put it in gear and it died. Got it to start again about 5 days later by spraying tbi cleaner into tb, revved it up and as long as I rev slowly no issue, try to rev it up too quick and and it feels like engine is choking. Put it in gear and it died. I have run out of ideas. Fuel pressure while at rest is 42 pounds did not check while running or trying to start. Somebody please help?
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Friday, July 17th, 2009 AT 6:58 PM

7 Replies

Tiny
EASTMACC
  • MEMBER
  • 4 POSTS
Engine was replaced in feb only has about 3000 miles on it. Replaced cap, rotor, water pump oil pump etc, everything but the tin. Ran like a champ until the other day.
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Well, check the pressure while you're trying to start, or while it's running.
Maybe even try to see if it will run on starting fluid

something I see often on GM trucks of about the same year, the female connectors for the fuel pump relay loose their "springiness" from getting hot and dont have a good grip on the relay.

And of course check for spark the next time it's dead.
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
BROBBINS100
  • MEMBER
  • 10 POSTS
Had The same problem with mine last year. The check valve in the fuel pump was faulty. Not allowing adequate fuel pressure for acceleration. I bought Two pumps from auto zone both did same thing. Installed a third my truck was running fine now it's starting to choke again. Check fuel pressure while idling and while under acceleration also put in gear so it's under a load and check the fuel pressure.
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
EASTMACC
  • MEMBER
  • 4 POSTS
Does anyone know the expected fuel pressure, both at key on and at idle?
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
BROBBINS100
  • MEMBER
  • 10 POSTS
I was told No More Than 66 psi and no less than 60 psi.
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
EASTMACC
  • MEMBER
  • 4 POSTS
I finally went and got a haynes, it should be between 56 and 62 according to the manual. So I'm pretty sure it has to be a problem with either the pump or the check valve because I can't find a clog anywhere in the lines. Also, has anyone out there done the swap from csfi to mpfi? I was checking resistance on my injectors and the manual says that it should about 1.4 ohms or so for csfi, and about 12 for mpfi. Mine are ll.8 ohms so that would check with the mpfi injectors. Aside from the injectors themselves, is anything else changed with the swap?
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Wednesday, September 2nd, 2020 AT 5:36 PM
Tiny
BROBBINS100
  • MEMBER
  • 10 POSTS
Your not gonna belive this but I also changed my injectors to multi port in my hunt for my fuel problem. All it was was an assembly that looked almost exactly the same as the stock ones just with a little bigger end due to the fact the injector is there instead of in the housing. Truthfully I dont kno if i'm missing something or should of changed the computer or what not but I feel as if my truck hasn't run like it should since I put them in.
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Wednesday, September 2nd, 2020 AT 5:36 PM

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