NefMoto > Noob Zone > Noob Questions (Moderator: turboat) > How know if it is my Fuel injector or Fuel pump ??
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Author Topic: How know if it is my Fuel injector or Fuel pump ??  (Read 5473 times)
Jordy971
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« on: January 13, 2015, 02:48:47 AM »
Hi,

How can i know if it is my fuel pump or my fuel injector which is not good for my power ?? and make lean afr

Thankyou in advance
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TijnCU
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flying brick
« Reply #1 on: January 13, 2015, 04:24:41 AM »
You could look at your injection times (or calculated idc). If you are over 20ms at 6000rpm your injectors are incapable of injecting more fuel and are effectively open non stop. If your injector ontime is less you could have an incapable fuel pump. 
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Jordy971
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« Reply #2 on: January 13, 2015, 04:54:01 AM »
Okay, thank you very much for your fast answer

I will look if I have this info on my Bosch ME9 with Innovate LM2
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turboman
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« Reply #3 on: January 14, 2015, 01:10:22 AM »
this is not working for direct injection egines!!!!
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Beaviz
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« Reply #4 on: January 14, 2015, 09:09:11 AM »
You can also check the injection timing on a DI engine (VCDS group 101). On a DI engine you would keep it below 10ms.

But why use an external wideband instrument? AFAIK all ME9 are already equipped with a wideband sensor.
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eliotroyano
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« Reply #5 on: January 14, 2015, 09:56:31 AM »
Quote from: Jordy971 on January 13, 2015, 02:48:47 AM
Hi,
How can i know if it is my fuel pump or my fuel injector which is not good for my power ?? and make lean afr
Thankyou in advance

That could be a nice question for older M38x/M59x systems where 16.32ms, from the info that I have, is the max injector duty cycle showed in data logs, but not directly to injectors. Without external equipment how can we determine that?
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Jordy971
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« Reply #6 on: January 14, 2015, 02:08:04 PM »
Quote from: Beaviz on January 14, 2015, 09:09:11 AM
You can also check the injection timing on a DI engine (VCDS group 101). On a DI engine you would keep it below 10ms.

But why use an external wideband instrument? AFAIK all ME9 are already equipped with a wideband sensor.

I prefer a little instrument I dont want keep always my PC in cars ..

What you advise me for log on a ME9 Ford Because I dont have injection time with Innovate
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Beaviz
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« Reply #7 on: January 15, 2015, 02:59:08 AM »
Sorry, this thread is already messed up. I was too focused on previous answers: ME9 is not a direct injection engine. MED9 is.
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TijnCU
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flying brick
« Reply #8 on: January 17, 2015, 01:14:16 AM »
I assume you could monitor the fuel rail pressure. If the pump is not capable the pressure will drop on high load. The question is how accurate that is when you work with rising rate regulators, you would have to compare it directly with manifold pressure.
I would start by calculating injector capability, if you are around 80% duty for your hp numbers the injectors should be good and it is most likely fuel pump flow or pressure.
I used this calculator some time ago, it may help to see if you are around the limit of your injector for your power figures.
http://www.witchhunter.com/injectorcalc1.php
« Last Edit: January 20, 2015, 02:31:48 AM by TijnCU » Logged
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