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corvet64
New User
Oct 4, 2009, 8:49 PM
Post #1 of 2
(1729 views)
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94 taurus wont start
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the car runs great then one day u turn on the key and everything works properly except no power to the fuel pump. can hook a jumper wire to wires at the inertia switch and the pump works fine but the car still wont start.cant find a relay anywhere or any info on what it might be.last time it did this was about 4months ago.got mad and left it sit for 2 weeks figured i would try it one day an
d it fired up and ran great for 3 months.any help would be greatly appreciated. am at my wits end thanks corvet64
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 5, 2009, 2:29 AM
Post #2 of 2
(1723 views)
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Re: 94 taurus wont start
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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 test 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, (already done)
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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