Injector does not open

[sp0ng3b0ck]

Hello everybody,

I equipped my Mini SPi with a MS, but it won't start because the injector does not open.
There are 12V at the injector and fuel pump is running.
If I have a look at the pins of the injector, the oszilloscope shows that the MS grounds the injector, but just for 500ys. I think this is too short and doesn't is long enough to open the injector. Changing the pwm-settings in Tunerstudio doesn't seem to have any effect...
Any ideas?

Engine runs with stock ecu.

[Matt Cramer]

It's showing ground applied for 7.2 ms. See this article for how to check the injector drive circuits.

[sp0ng3b0ck]

Which article?

This is the signal messured over the injector:


the first switch is the normal pwm from the MS and that strange thing after is what happens, if you manualy add fuel on the throttle valve.

[Matt Cramer]

Sorry, here's the link.

http://www.diyautotune.com/tech_article ... ooting.htm

[sp0ng3b0ck]

Thanks you, I'll get into it tomorrow!