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microsquirt lsx sputter/ misfire

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Old 06-22-2016, 01:56 PM
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heres what i did sitting at my desk while i should have been working. If it doesnt run at all, use your old required fuel settings.

Before you upload this, save your tune somewhere.
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Old 06-23-2016, 07:04 AM
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Originally Posted by dburt86
heres what i did sitting at my desk while i should have been working. If it doesnt run at all, use your old required fuel settings.

Before you upload this, save your tune somewhere.

Didnt get a chance to try it weather was kind of shitty. If weather is okay when i get off today ill try it

-Cody
Old 06-23-2016, 07:04 AM
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sounds good!!
Old 06-23-2016, 07:05 AM
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Originally Posted by dburt86
sounds good!!
We replied same time lol. Weird
Old 06-23-2016, 07:06 AM
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that was weird haha
Old 06-23-2016, 07:14 AM
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Originally Posted by dburt86
that was weird haha
As long as this rain holds off after work ill go ahead and give it a shot.

Do i just open an old project and then load that file? Or should i create a new file and go through calibrating everything?
Old 06-23-2016, 09:18 AM
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start off by opening the project and "save tune as" and save what you currently have to your desk top.

Then, while connected, goto "load tune" and upload mine.

Ive seen the required fuel do some weird things when in batch fire, (probably a good answer for this that i dont know) so if it doesnt run at all, just look at your old tune and use the values that you originally had.

I didnt change any other settings that would prevent it from running.

When making changes, just keep in mind that if everything else is right, the VE should be smooth. Engines wont typically require more VE at a lower load then it will at higher load in the same RPM cloumn
Old 06-23-2016, 08:23 PM
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Originally Posted by dburt86
start off by opening the project and "save tune as" and save what you currently have to your desk top.

Then, while connected, goto "load tune" and upload mine.

Ive seen the required fuel do some weird things when in batch fire, (probably a good answer for this that i dont know) so if it doesnt run at all, just look at your old tune and use the values that you originally had.

I didnt change any other settings that would prevent it from running.

When making changes, just keep in mind that if everything else is right, the VE should be smooth. Engines wont typically require more VE at a lower load then it will at higher load in the same RPM cloumn
Still shitty weather here. Im off all day Saturday and its supposed to be nice so ill upload it first thing saturday morning and report back. If it starts am i supposed to drive it and see how it reacts? And then get a log?
Old 06-24-2016, 08:15 AM
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Originally Posted by xxwhiteneonxx
Still shitty weather here. Im off all day Saturday and its supposed to be nice so ill upload it first thing saturday morning and report back. If it starts am i supposed to drive it and see how it reacts? And then get a log?
Yea you can. Make sure you turn off the accel enrichment and give me some steady throttle datalogs. Like going up a long hill, cruising, ect. Don't go above 12 or so in boost if you boost it. Make sure your boost cut is set low, like 2 psi above spring pressure
Old 06-24-2016, 08:23 AM
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Default Broke another motor, goddamn it. Speculation on failure welcomed

... Meant to start a new thread
Old 06-25-2016, 12:57 PM
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heres a datalog after the changes you made.

-Cody
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Old 06-25-2016, 02:15 PM
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Originally Posted by xxwhiteneonxx
heres a datalog after the changes you made.

-Cody
Also, why when i try to hold the rpm steady ( no matter what rpm it is) it sputters and fluctuates. It looks like it goes lean for a second then rich again
Old 06-25-2016, 06:02 PM
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Let me take a look
Old 06-26-2016, 10:20 AM
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Originally Posted by dburt86
Let me take a look

Was driving car around a little more and noticed it has that stumble at any rpm theres no specific rpm it does it at and if you try to hold steady rpm it will drop and raise about 500 rpm on its own. I noticed it goes lean for a second when it drops the rpms.
Old 06-26-2016, 11:12 AM
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Originally Posted by xxwhiteneonxx
Was driving car around a little more and noticed it has that stumble at any rpm theres no specific rpm it does it at and if you try to hold steady rpm it will drop and raise about 500 rpm on its own. I noticed it goes lean for a second when it drops the rpms.
That sounds like either a vacuum leak or the timing value is way off

Try adding 10% of fuel everywhere and see if it stabilizes
Old 06-26-2016, 11:29 AM
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Originally Posted by dburt86
That sounds like either a vacuum leak or the timing value is way off

Try adding 10% of fuel everywhere and see if it stabilizes
What would adding 10% fuel solve?

The whole motors been sprayed before and no leaks were present.

Timing value being way off id believe.
Old 06-26-2016, 07:16 PM
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Originally Posted by dburt86
That sounds like either a vacuum leak or the timing value is way off

Try adding 10% of fuel everywhere and see if it stabilizes

I took a log of it sputtering, ill upload it when i get home.

-Cody
Old 06-26-2016, 07:31 PM
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Originally Posted by xxwhiteneonxx
I took a log of it sputtering, ill upload it when i get home.

-Cody
A lot of times you can cover up issues like small vacuum leaks by running it way fat but really it doesn't help us much ultimately

I can take a look at the logs tomorrow during work
Old 06-26-2016, 09:55 PM
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Originally Posted by dburt86
A lot of times you can cover up issues like small vacuum leaks by running it way fat but really it doesn't help us much ultimately

I can take a look at the logs tomorrow during work

sputter log.
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sputter.msl (271.4 KB, 45 views)
Old 06-29-2016, 09:49 AM
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i took a look at the logs.

Couple things, first get it to a real operating temp, or make sure your CLT is calibrated right.

And as far as the surging, its either going to be a ignition setting thats wrong, your timing isnt synced or its walking, or you have a rather large vacuum leak.

Does the motor sound like its all there? The map singal looks rather noisy like a misfire or something?

does it ever run smooth?


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