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car won't start


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eyob07
User

Jul 7, 2017, 5:09 PM

Post #1 of 2 (452 views)
car won't start Sign In

Hi everyone, this is my friend's 04 maxima 3.5 engine, car cranks but won't start, the cause seems to be no spark, we check for power at the coil connector and there is battery voltage, the only engine code we see is air intake temperature high, we don't think that could cause this, the engine RPm gauge at the dash board doesn't move when it cranks does this mean something please help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 7, 2017, 5:41 PM

Post #2 of 2 (448 views)
Re: car won't start Sign In

You need to run a few more tests to determine what else may be missing.



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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