No injectors after cranking

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jsmcortina
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Re: No injectors after cranking

Post by jsmcortina »

ironwill11 wrote:I am trying to run the flow test for the injectors but I can't get the start button to activate in TS to run the test, even after clicking on activate test mode, and then activate fuel pump.
What injector pulsewidth are you setting? Your MSQ shows zero which won't do anything.

James
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ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

billr wrote:Are you is graying the injector-test "start" button is greyed-out, not availle, or that clicking on it has no effect? Do you have the same problem with the spark test?
Yes the "start" button is greyed out and yes i do have the same problem with the spark test. I do as thr manual says and click activate test button first but the start button stays greyed out and interestingly enough the "stop" button does activate.
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Re: No injectors after cranking

Post by jsmcortina »

As I posted, you need to set a pulsewidth to ungrey the Start button.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

jsmcortina wrote:
ironwill11 wrote:I am trying to run the flow test for the injectors but I can't get the start button to activate in TS to run the test, even after clicking on activate test mode, and then activate fuel pump.
What injector pulsewidth are you setting? Your MSQ shows zero which won't do anything.

James
jsmcortina wrote:
ironwill11 wrote:I am trying to run the flow test for the injectors but I can't get the start button to activate in TS to run the test, even after clicking on activate test mode, and then activate fuel pump.
What injector pulsewidth are you setting? Your MSQ shows zero which won't do anything.

James
When I tried to run the test, the parameters I used were:

Output interval: 30
Pulsewidth: 40ms (TS tells me that the max pulse width is 42)
Total number of injectors: 500

I did this so it will abide by the TS max rule and give me a 15 second test time which is easily multiplied to 1 minute for cc/min.
For some reason, now when I open up the test it has changed my rpm to 4006 instead of the 600 it used to have (I don't think this matters as I am running batch fire injection on a TBI system with two injectors.


I tried posting this a few times already but the forum keeps logging me out and when I sign back in it wont post it.
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Re: No injectors after cranking

Post by jsmcortina »

Using the test mode to hold the injectors open isn't a documented use of it. I can't promise that the time will be what you expect.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
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ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

jsmcortina wrote:As I posted, you need to set a pulsewidth to ungrey the Start button.

James

How would I set the pulsewidth for the megasquirt. I set the injector dead time, req-fuel (which is why I need to run the test), and the other settings that the manual suggests. It seems like I can only adjust the cranking pulsewidth percent.
ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

jsmcortina wrote:Using the test mode to hold the injectors open isn't a documented use of it. I can't promise that the time will be what you expect.

James
I an using the test mode to hold the injectors open because it was suggested by someone else to find out the injector flow rate which will give confidence that I have the correct req fuel. I have a 4.3 with the factory tbi injectors (5235209) and I have not been able to find any information on their flow rate on the internet; nor has Phil at DIYautotune; nor Mr. Injector. I am about at the point where I want either figure out their flow rate or get injectors that have documented flow rates. I figure if the injectors are held open that will give me 100% duty cycle and then I can do math to get to 80% duty cycle flow rate.
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Re: No injectors after cranking

Post by jsmcortina »

ironwill11 wrote:
jsmcortina wrote:As I posted, you need to set a pulsewidth to ungrey the Start button.
James
How would I set the pulsewidth for the megasquirt.
The pulsewidth on the testmode screen - in the MSQ (tune) you posted it is zero. When the pulsewidth is set to zero, the "Start" button is greyed out.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
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ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

jsmcortina wrote:
ironwill11 wrote:
jsmcortina wrote:As I posted, you need to set a pulsewidth to ungrey the Start button.
James
How would I set the pulsewidth for the megasquirt.
The pulsewidth on the testmode screen - in the MSQ (tune) you posted it is zero. When the pulsewidth is set to zero, the "Start" button is greyed out.

James
I know that MSQ is before I ran the test. I did not save it when I ran the test with the output and pulsewidth that I mentioned before (that holds the injectors open). So at hat point my pulse width was 40. I have the same greyed out appearance when I try to run a spark test as well.

I was asking about the pulsewidth for when I am trying to run the engine. My injectors do not squirt any fuel once the engine goes about cranking threshold, and I was concerned that either the pulsewidth (not in test mode) is too low (datalog shows that it is sending signal to the injectors) or the injectors are bad and not openning for a lower signal.
fj1289
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Re: No injectors after cranking

Post by fj1289 »

Does the fuel pump stay energized after the engine reaches its start parameters? Do you have a gauge or pressure sensor for fuel pressure?
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Re: No injectors after cranking

Post by jsmcortina »

ironwill11 wrote:
jsmcortina wrote:As I posted, you need to set a pulsewidth to ungrey the Start button.

James
I have the same greyed out appearance when I try to run a spark test as well.
To ungrey the Start button for injector test mode, the following must all be done:
- click Enable Test Mode
- select how many injectors to test (i.e. One)
- select which injector to test
- select the test pulsewidth
- select the injections count

Unless you do all of that, the button will be greyed out.
Oh, and obviously the Megasquirt needs to be on and the engine not running.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
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ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

fj1289 wrote:Does the fuel pump stay energized after the engine reaches its start parameters? Do you have a gauge or pressure sensor for fuel pressure?
Yes I do have a fuel pressure gauge. I actually took out the electric one and put in a manual one for testing purposes. The fuel pressure is maintained until it stalls. This time it started up and idled for a for seconds then stalled. It did that one or two more times before it would stay running.

https://www.youtube.com/watch?v=Bg7C2sWwv8I
ironwill11
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Re: No injectors after cranking

Post by ironwill11 »

Update:

I adjusted the cranking threshold down to 400 rpm so it is not so close to ideal idle (mid 600s). It started and idled for a few seconds and after a couple of times doing it, the engine stayed running on its own. The peak and hold was still turned off from my last tests. I turned it back on and it the problem returned. I adjusted the current limit to 75% and 1.6ms time threshold (was supposed to be 1.5ms but my finger slipped when I hit the button and I didn't realize it). Anyway it started and idled with a decent idle (800-900rpm) although a little surge started to appear. Since it was idling on its own I took another video of the timing and the injectors.

Datalog with peak and hold off:
2016-10-25_19.40.04_crank400.msl
Datalog with peak and hold 75% and 1.6ms:
2016-10-25_20.04.37_P&H_75_1.5.msl
About 1/3 of the time it would the starter would engage but then grind against the flywheel. I am hoping that is the battery getting worn down from all this starting.

Video of timing which is pretty close, although it seems like it has a little waviness in it (you can also hear the failed start in the beginning too):
https://www.youtube.com/watch?v=IJFXHvwWHII

Any suggestions on how to clean up the timing better, or should I move on with the tuning first?

Will
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