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Jeff Baldridge
Novice
Jul 19, 2012, 3:58 PM
Post #1 of 7
(3801 views)
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1997 yukon won`t start
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97 gmc yukon ,ran out of gas ,put gas in ,wont start.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 19, 2012, 4:23 PM
Post #2 of 7
(3779 views)
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Re: 1997 yukon won`t start
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OK, what is the fuel pressure now?
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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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Jeff Baldridge
Novice
Jul 19, 2012, 7:14 PM
Post #3 of 7
(3758 views)
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Re: 1997 yukon won`t start
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not sure ,how would i check that? I`ll do what I can with limited knowledge and funds.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 19, 2012, 7:18 PM
Post #4 of 7
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Re: 1997 yukon won`t start
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You've already changed the fuel pump and you've never tested the fuel pressure? That "dart board" methed will only serve to cost you a fortune and fix nothing.
Here's what you need to do before replacing anything else.
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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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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Jeff Baldridge
Novice
Jul 19, 2012, 7:22 PM
Post #5 of 7
(3748 views)
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Re: 1997 yukon won`t start
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I have not replaced anything yet I just towed it home.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 19, 2012, 7:24 PM
Post #6 of 7
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Re: 1997 yukon won`t start
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I misread that. I thought you replaced the pump.
In tank fuel pumps are cooled and lubricated by the fuel in the tank. When you run a car out of gas, it pumps a lot of air through the pump which overheats it and causes some severe wear and many times, failure when they cool off.
You will need to use a fuel pressure gauge to verify this
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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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Jeff Baldridge
Novice
Jul 19, 2012, 7:25 PM
Post #7 of 7
(3741 views)
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Re: 1997 yukon won`t start
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Very good , I have some work to do then ,thanks.
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