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93 gmc safari starting problems
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daconner1950
Novice
Nov 19, 2010, 12:07 PM
Post #1 of 11
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93 gmc safari starting problems
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i have a 93 gmc safari 4.3 w motor . i put a fuel inlet line under intake. it now won't start. it has good spark and fuel. checked all connections and wires with meter.can't read codes it says battery disconnected to long. is there a sensor or something that will not let it start? the only code i had before i started working on it was low voltage to fuel pump. it ran fine with this code before. it turns over fast but won't start. tried starting fluid and nothing. I would appreciate any help,that might get me going in the right direction. thanks very much. dac1950
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Hammer Time
Ultimate Carjunky
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Nov 19, 2010, 12:22 PM
Post #2 of 11
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Re: 93 gmc safari starting problems
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What is your fuel pressure?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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daconner1950
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Nov 19, 2010, 12:31 PM
Post #3 of 11
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Re: 93 gmc safari starting problems
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i don't have a gauge . would it n0t run at all with low fuel pressure?
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Hammer Time
Ultimate Carjunky
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Nov 19, 2010, 1:00 PM
Post #4 of 11
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Re: 93 gmc safari starting problems
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This engine is very fussy about fuel pressure. You need to know what it is.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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daconner1950
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Nov 19, 2010, 1:11 PM
Post #5 of 11
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Re: 93 gmc safari starting problems
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OK i'll get a guage and get back to you when i have the #s. thanks very much. you have helped me get 2 cars going. i am disabled but feel rewarded when i fix something , and your help makes it possible.
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Hammer Time
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Nov 19, 2010, 1:14 PM
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Re: 93 gmc safari starting problems
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you need 50 to 55PSI minimum to run.
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daconner1950
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Nov 19, 2010, 1:52 PM
Post #7 of 11
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Re: 93 gmc safari starting problems
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what is the voltage going into the fuel pump?
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Hammer Time
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Nov 19, 2010, 2:06 PM
Post #8 of 11
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Re: 93 gmc safari starting problems
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Whatever battery voltage is at the time. Should be about 14v with engine running and no load on the line.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
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Nov 19, 2010, 8:13 PM
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Re: 93 gmc safari starting problems
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You need to find out the fuel pressure as HT suggested, it's very critical on this system....
Also make sure you injector connecter if hooked up and tight.
If it was hooked up then you might want to disconnect it and put a noid light in the harness end and make sure you have injector pulse
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daconner1950
Novice
Nov 20, 2010, 7:40 AM
Post #10 of 11
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Re: 93 gmc safari starting problems
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thanks a lot for the info. What is a noid light? I'm a electronic tech. but i don't remember hearing of one.
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Hammer Time
Ultimate Carjunky
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Nov 20, 2010, 9:22 AM
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Re: 93 gmc safari starting problems
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It's a low impedance test light for checking sensitive circuits. They plug right into the injector plugs on most vehicles but on the Vortec system, you will have to improvise to tap into the right wires.
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