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geq002
New User
Mar 15, 2012, 3:40 PM
Post #1 of 2
(1414 views)
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Vehicle Will Not Start
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I have a 2000 Nissan Frontier with a 3.3L engine, and when I turn the key, the engine just turns and turns, but will not start. When I saw this post I checked the plastic nipple. However I did not find one. I called the guy I bought it from, and he said that they bypassed that safety switch and rand some kind of wire directly as if the safety switch was always pressed, and tehrefore the truck should crank even without the clutch being pressed. Could this be causeing the starting problem? How would I reverse it? Is there perhaps some fuse or relay that could have been blown by this bypass that I could just change? (*note: When I bought the truck, It would crank just fine, even without the clutch pressed).
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2012, 4:22 PM
Post #2 of 2
(1387 views)
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Re: Vehicle Will Not Start
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If the starter cranks, the bypass is working.
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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