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Cotybstone
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Mar 12, 2012, 1:02 PM
Post #1 of 24
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95 z71 extended Cab 350
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My truck will not start. The fuel pump is working, I have fire, but no gas coming out of the injectors, but have pressure at the injectors even tried replacing the injectors but to no avail, I can put gas in the throttle body and will run for a second, please help....
(This post was edited by Cotybstone on Mar 12, 2012, 1:04 PM)
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Hammer Time
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Mar 12, 2012, 1:09 PM
Post #2 of 24
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Re: 95 z71 extended Cab 350
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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. This one is OK
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.
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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Cotybstone
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Mar 12, 2012, 1:15 PM
Post #3 of 24
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Re: 95 z71 extended Cab 350
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Got fire.
don't have that light
What is the fuel pressure supposed to be?
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Hammer Time
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Mar 12, 2012, 1:17 PM
Post #4 of 24
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Re: 95 z71 extended Cab 350
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You'll have to get the light. It's a TBI so the fuel spec is 9-13PSI
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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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Cotybstone
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Mar 12, 2012, 1:21 PM
Post #5 of 24
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Re: 95 z71 extended Cab 350
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Ok. Thanks I'll get it in the next couple of hours.
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Cotybstone
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Mar 12, 2012, 1:47 PM
Post #6 of 24
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Re: 95 z71 extended Cab 350
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Ok, fuel pressure good, light shows no gas coming out, but have power on one side...
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Hammer Time
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Mar 12, 2012, 2:45 PM
Post #7 of 24
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Re: 95 z71 extended Cab 350
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You haven't tested with a noid light yet.
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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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Cotybstone
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Mar 12, 2012, 2:46 PM
Post #8 of 24
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Re: 95 z71 extended Cab 350
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Is that like A uv light?
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Hammer Time
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Mar 12, 2012, 2:50 PM
Post #9 of 24
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Re: 95 z71 extended Cab 350
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No, it's a little bulb that you plug into the injector plug to test for the operating signal. They cost under $10.
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Cotybstone
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Mar 12, 2012, 3:10 PM
Post #10 of 24
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Re: 95 z71 extended Cab 350
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Wow I feel, slow...lol. But I hooked it up and it flashed and then stayed on as I tried to start it, but once I hooked it back up the injectors starred working again and ran... So now I'm really scared to drive it for fear of breaking down.
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Hammer Time
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Mar 12, 2012, 3:11 PM
Post #11 of 24
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Re: 95 z71 extended Cab 350
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Do you mean it remained solid while you were cranking or it continued to flash?
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Cotybstone
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Mar 12, 2012, 3:14 PM
Post #12 of 24
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Re: 95 z71 extended Cab 350
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Looked as if it was solid, but it its not an led and the guy says those are not as reliable.
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Hammer Time
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Mar 12, 2012, 3:16 PM
Post #13 of 24
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Re: 95 z71 extended Cab 350
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I don't know what you're trying to use here but if you're using anything but a noid light to do this you could end up with a fried computer if you haven't already.
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Cotybstone
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Mar 12, 2012, 5:35 PM
Post #14 of 24
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Re: 95 z71 extended Cab 350
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Got truck running again, shut off on me again did the noid light again no light...
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Cotybstone
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Mar 12, 2012, 5:37 PM
Post #15 of 24
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Re: 95 z71 extended Cab 350
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And I still have power to one side, but when it was running the injectors was making a clicking sound...
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Hammer Time
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Mar 12, 2012, 5:40 PM
Post #16 of 24
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Re: 95 z71 extended Cab 350
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You're losing injector pulses. If you are not losing spark at the same time, then it's looking like a bad computer or something related to it. Be sure to check all the grounds for the computer.
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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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Cotybstone
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Mar 12, 2012, 5:55 PM
Post #17 of 24
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Re: 95 z71 extended Cab 350
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Thank you so much I will check and keep you posted. I learned alot today, you even taught my local advanced auto parts what a noid light was...lol ps, dont buy one from there $38, but it worked,
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Cotybstone
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Mar 13, 2012, 4:17 PM
Post #19 of 24
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Re: 95 z71 extended Cab 350
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Ok this is what is going on, I pulled the fuel pump now when testing the fuel pump is it suppose to stay on when pumping gas from the tank to A bucket?
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Hammer Time
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Mar 13, 2012, 4:22 PM
Post #20 of 24
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Re: 95 z71 extended Cab 350
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That depends on what you are powering it with. The car will only power it for 2 seconds.
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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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Cotybstone
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Mar 13, 2012, 4:25 PM
Post #21 of 24
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Re: 95 z71 extended Cab 350
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Well how do I know if it its bad cause if I beat on the tank then the truck will start, but then shuts off again then I can twist the process with same results
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Hammer Time
Ultimate Carjunky
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Mar 13, 2012, 4:29 PM
Post #22 of 24
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Re: 95 z71 extended Cab 350
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If pounding on the tank makes it start, then you likely have a bad fuel pump but if you have followed my instructions in the first place instead of lieing to me about the fuel pressure, you would have known that a long time ago and wouldn't have wasted everybody's time.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Cotybstone
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Mar 13, 2012, 4:37 PM
Post #23 of 24
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Re: 95 z71 extended Cab 350
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Well when the fuel pump does run it has good psi... Out just works when it wants to like it has a bad connection, and out makes my fuel pump relay get extremely hot which is what led me to my fuel pump today, was not lying, sorry for wasting your time....
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Hammer Time
Ultimate Carjunky
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Mar 13, 2012, 4:39 PM
Post #24 of 24
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Re: 95 z71 extended Cab 350
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If you were monitoring the fuel pressure during the failure as you were advised to, it would have been very obvious. I know you never used a fuel pressure gauge.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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