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Nissan Micra Stumping Mechanics Everywhere!

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New User

Sep 21, 2017, 1:41 PM

Post #1 of 2 (590 views)
  post locked   Nissan Micra Stumping Mechanics Everywhere!  

Hi there all

I have a W reg Nissan Micra, 55,000 miles on the clock, automatic lovely little car, just right for our small family, runs like a dream during the spring and summer.


Along comes the cold weather and she just won't start. The engine turns over, but simply wont catch. After around 20 minutes of trying to get her started, the engine I assume eventually warms up and she starts and then for the rest of the day she runs absolutely fine, even if she's sat on a car park for the next 8 hours, she starts first time.

For her not to start it has to be both cold AND wet. If it's just cold she starts, if it's just wet, she starts, but both together and it's a no-go.

I've taken her to 3 different mechanics now and have had over £400 worth of work done. Today was the first day since early in the year when she hasn't started, so I really need to get this sorted as the cold, wet mornings increase in frequency.

So far we've had the following work done....

All spark plugs changed
Air filters changed
Wiring loom replaced (fitted cold start loom)
Sensors changed

There is a note to say that when the spark plugs were changed, it was flooded.

The one mechanic is now saying the only other thing he thinks it could be the Throttle Body, whatever that is? Does anyone have a clue what might be wrong?

Any help greatly appreciated!


(This post was edited by JaneSharon86 on Sep 21, 2017, 1:42 PM)

Hammer Time
Ultimate Carjunky / Moderator
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Sep 21, 2017, 3:21 PM

Post #2 of 2 (576 views)
  post locked   Re: Nissan Micra Stumping Mechanics Everywhere!  

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.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.


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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