running one minute/not running minute later??

omegapi · 10-19-2009, 09:15 AM

93 gmc sierra 1500 5.7 liter, will not start, turns over/won't run.one week previous check engine light came on intermittenly,thinking it was fuel related, sprayed starter fluid into throttle body, engine started but stop after few seconds, replaced fuel pump fuse and pump relay, changed fuel pump in gas tank, still no response. what should i look at next??? Thanks!! everyone, sorry not have given proper truck info the first time........

gmctrucks · 10-19-2009, 09:48 AM

Welcome to the forum and howdy from TEXAS. You said you changed out the fuel pump in the engine well it's not in the engine it's in the gas tank. What did you change out in the engine thinking it was the pump also turn your key forward to where your dash lights turn on and listen for the pump can you hear it? And the reading of the gas gauge it sounds like the sending unit is bad.
1991 1992 1993 1994 GMC PICKUP CK SIERRA SENDING UNITS:eBay Motors (item 280406992574 end time Nov-06-09 14:03:24 PST)

bradrhale · 10-19-2009, 11:48 AM

check the OBD1 codes and you should be able to narrow your problem down. first thing first, your truck has no carb. do you have spark at the spark plugs?? do you have a 12volt source at the fuel injectors?? both injectors??

crabtruck · 10-20-2009, 12:40 AM

Welcome to the forum omegapi.

Good info on how to pull codes from that OBD-I you have (pre-1996)
Just do a quick search of forum for "paperclip" (not kidding)
One good one:
Just Wondering

Don't feel bad about having left some info out, happens alot.
More you can think to add the better, no such thing as too much.
And if you skip something someone will probably ask.

hippiegroove · 10-23-2009, 10:09 PM

Sounds like a similar problem to what i have going on. Check the codes first , and see if any are TBI or fuel related , and go from there.
I have a post up as well asking for help - and its pretty lengthy - so let me know if you figure out what your problem is - mine sounds similar , but with other issues as well

10-19-2009, 09:15 AM	#1
omegapi Junior Member Join Date: Oct 2009 Location: new jersey Posts: 1	running one minute/not running minute later?? 93 gmc sierra 1500 5.7 liter, will not start, turns over/won't run.one week previous check engine light came on intermittenly,thinking it was fuel related, sprayed starter fluid into throttle body, engine started but stop after few seconds, replaced fuel pump fuse and pump relay, changed fuel pump in gas tank, still no response. what should i look at next??? Thanks!! everyone, sorry not have given proper truck info the first time........ Last edited by omegapi; 10-19-2009 at 03:38 PM. Reason: didn't clearly give truck problem information...

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10-19-2009, 09:48 AM	#2
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,037	Welcome to the forum and howdy from TEXAS. You said you changed out the fuel pump in the engine well it's not in the engine it's in the gas tank. What did you change out in the engine thinking it was the pump also turn your key forward to where your dash lights turn on and listen for the pump can you hear it? And the reading of the gas gauge it sounds like the sending unit is bad. 1991 1992 1993 1994 GMC PICKUP CK SIERRA SENDING UNITS:eBay Motors (item 280406992574 end time Nov-06-09 14:03:24 PST)

10-19-2009, 11:48 AM	#3
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,030	check the OBD1 codes and you should be able to narrow your problem down. first thing first, your truck has no carb. do you have spark at the spark plugs?? do you have a 12volt source at the fuel injectors?? both injectors??

10-20-2009, 12:40 AM	#4
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Welcome to the forum omegapi. Good info on how to pull codes from that OBD-I you have (pre-1996) Just do a quick search of forum for "paperclip" (not kidding) One good one: Just Wondering Don't feel bad about having left some info out, happens alot. More you can think to add the better, no such thing as too much. And if you skip something someone will probably ask.

10-23-2009, 10:09 PM	#5
hippiegroove Junior Member Join Date: Oct 2009 Posts: 11	Sounds like a similar problem to what i have going on. Check the codes first , and see if any are TBI or fuel related , and go from there. I have a post up as well asking for help - and its pretty lengthy - so let me know if you figure out what your problem is - mine sounds similar , but with other issues as well