Injectors won't close of priming

Tommy · Post by **Tommy** » Sat Dec 19, 2015 5:58 am

On initial power up the pump runs for 2 secs and the injectors open but don't close leading to flooding. I've obviously made some changes to something as they were functioning correctly. Where is a good place to start looking. Can I disable priming?
Tommy

Tommy · Post by **Tommy** » Sat Dec 19, 2015 10:35 am

I seem to have a problem that Inj 1 (pin 9) is constantly firing the injectors. At power on inj 1 gives 12.3 v and doesn't turn off after 2 secs whereas inj 2 gives about 9v, presumably due to the PWM and turns off after 2 secs. When cranking Inj 2 pulses but inj 1 just keeps running all the time. I'm using v3.2.5. Is there some way I can get inj 1 to work correctly? I've tried re-loading the firmware.

This is a problem that has recently arrived. I was running fine previously.
Thanks
Tommy

Matt Cramer · Post by **Matt Cramer** » Mon Dec 21, 2015 8:07 am

Unplug the MicroSquirt and check its resistance from injector outputs to ground. Let me know what you find.

Tommy · Post by **Tommy** » Wed Dec 23, 2015 4:54 am

Matt,
Thanks for the response. Since my last post(s) I rewired the injectors so that they all (4) worked off pin 10 and I was really pleased when the engine started and seemed to run OK. However on the second run I found that the same symptom has now afflicted pin 10 and all the injectors are open all the time there is power to the ECU. I tried re-setting to the previous restore point but no luck.
In answer to your question I can measure no resistance between pin 9 or 10 on the microsquirt with the plug removed and ground. I had originally thought there might be a ground on the wiring to the injectors but there is no circuit there either. It makes me wonder whether I have a hardware problem in the microsquirt, if so I need to know what is causing it.
many thanks
Tom

Tommy · Post by **Tommy** » Wed Dec 23, 2015 5:53 am

Matt,
Brain not engaged due to onset of Christmas! Previous measurements made to vehicle ground which of course is not connected with plug removed! Pin9 to pin 23 =76 ohms pin, 10 to pin 23 =23 ohms.
Tom

Matt Cramer · Post by **Matt Cramer** » Mon Dec 28, 2015 8:33 am

This sounds like hardware damage. Contact your seller directly to check if it's under warranty.

Tommy · Post by **Tommy** » Tue Dec 29, 2015 12:05 pm

Thanks, Matt. I figured it might be that.
happy New Year
Tom

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Injectors won't close of priming

Injectors won't close of priming

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