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Old 11-17-2013, 09:38 PM   #1
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Angry MS PNP 2 Miata backfires but wont start...

Hey guys heres the deal 1992 miata 1.6l.

megasquirt PNP 2
GReddy tdo5h turbo kit
440cc injectors....
stock FPR
Stock TIMING (100% accurate)
STOCK IGNITION
AIT sensor (MAF DELETE)

She starts up and idles on the stock ecu but its obiously bad because the injector size etc.....

We uploaded the new firmware 2x on the new ecu.... We use the settings as per diy auto tune suggests for the 1992 miata.
IT wont start up and run on the MS like it should...

CAN SOMEONE HELP WITH ANY INFORMATION IVE BEEN at this for days and am ready to burn this god damn miata to the ground... THANKS
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Old 11-17-2013, 10:04 PM   #2
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Quote:
Originally Posted by slammedkouki View Post
Hey guys heres the deal 1992 miata 1.6l.

megasquirt PNP 2
GReddy tdo5h turbo kit
440cc injectors....
stock FPR
Stock TIMING (100% accurate)
STOCK IGNITION
AIT sensor (MAF DELETE)

She starts up and idles on the stock ecu but its obiously bad because the injector size etc.....

We uploaded the new firmware 2x on the new ecu.... We use the settings as per diy auto tune suggests for the 1992 miata.
IT wont start up and run on the MS like it should...

CAN SOMEONE HELP WITH ANY INFORMATION IVE BEEN at this for days and am ready to burn this god damn miata to the ground... THANKS
So, as you're able to connect to the MS with your laptop how about a cranking log along with the tune? More info about the setup; car = '92. engine = ?, FI (assuming you are otherwise why put 440cc injectors in).

Last edited by bahurd; 11-17-2013 at 10:16 PM.
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Old 11-17-2013, 11:21 PM   #3
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Sorry I'll post a 10 second cranking log tomorrow. I would now but the car back fires so loud after cranking my neighbors thought it was a shotgun....

Engine 1992 1.6 litre
Weisco pistons
Eagle rods
Oem bearings
Oem crank
Arp studs
Felpro hg
Just had the head cleaned, valve job, etc
New timing belt and water pump
Etc....
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Old 11-18-2013, 12:19 AM   #4
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UPDATE** i just found that the previous owner had the AIT air intake temp WIRES to the wrong pins in the maf connector...... SO that may explain some issues...
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Old 11-18-2013, 08:20 AM   #5
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you're injecting too much fuel. Tell the MS to inject the right amount of fuel.

in other words: tune.
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Old 11-18-2013, 09:44 AM   #6
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^^ What he said...

A good starting point, if the injectors really are 440cc would be setting req_fuel around 8.1ms

That should at least get to an idle assuming too much fuel.
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Old 11-18-2013, 01:17 PM   #7
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When I go I to basic settings and fuel calculator I enter 1600cc in engine displacement. The go down to injector flow and enter 440 then click cc/min and burn it and it comes up with a calculated fuel number on its own? Is this wrong
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Old 11-18-2013, 01:20 PM   #8
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no it's not.
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Old 11-18-2013, 01:26 PM   #9
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Braineak I'm going to do a 10 second cranking log real quick. Then I'll upload it stand by
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Old 11-18-2013, 01:40 PM   #10
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you certain the MAP sensor is plugged it? what basemap? what other tuning for fueling/cranking have you done?
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Old 11-18-2013, 01:43 PM   #11
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Default heres the datalog....

Keep in mind guys after this cranking session.... along with every other one.. SHE BACKFIRES SO LOUD AND IM TALKING IT SOUNDS LIKE A BOMB..... MY 400whp 240sx has antilag and these backfires are louder...
Attached Files
File Type: msl why wont you start.msl (98.4 KB, 88 views)
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Old 11-18-2013, 01:53 PM   #12
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that means it's dumping in a crap ton of fuel and then igniting all at once.

so that happened in about 4 seconds of cranking? are you sure they are good 440cc injectors? could they be bad or flowing much more than 440cc? the PW at cranking isn't THAT high.

why not try to lower the req_fuel more and more until it starts. that will give you an idea if it;s the fueling or if something else is at play.


this is a mspnp2? do you have a vTPS? do they make any notes about not using the factory TPS?
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Old 11-18-2013, 01:57 PM   #13
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Quote:
Originally Posted by Braineack View Post
you certain the MAP sensor is plugged it? what basemap? what other tuning for fueling/cranking have you done?
I think the basemap we are using is the 240cc one from diy auto tune..... heres the link...

DIYPNP MegaSquirt installation for the Mazda Miata
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Old 11-18-2013, 01:58 PM   #14
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Post msq (tune file).
We'll instantly see what's messed up. I'm saying Req_fuel may be right but after start, warm up, and VE table haven't been changed.
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Old 11-18-2013, 02:04 PM   #15
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I actually just went out and took a look at my MAF CONNECTOR.... There is 7 pins on it.... DIY's SITE SHOWS ONE WITH 5??? and the wire colors dont match per diy auto tunes website..... so i unplugged the sensor at the intercooler until i can figure out what the hell this wiring is now....

mine...


THERES....


Attached Thumbnails
MS PNP 2 Miata backfires but wont start...-730029bf-8729-4812-8541-2b760110bffa-3344-0000033b1613b63e_zpse342e0d3.jpg   MS PNP 2 Miata backfires but wont start...-09dbde01-7102-4d9e-baaa-311481efc8c9-3344-0000033b886992c8_zps1d9fe6c1.jpg   MS PNP 2 Miata backfires but wont start...-4d2066d3-7d6a-4eb6-ac5f-259adf5858a9-3344-0000033b8e29b2ba_zpsa2620f34.jpg  
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Old 11-18-2013, 02:11 PM   #16
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Default current tune.....

here it is.....
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File Type: msq CurrentTune.msq (84.0 KB, 75 views)
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Old 11-18-2013, 02:14 PM   #17
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Quote:
Originally Posted by Braineack View Post
that means it's dumping in a crap ton of fuel and then igniting all at once.

so that happened in about 4 seconds of cranking? are you sure they are good 440cc injectors? could they be bad or flowing much more than 440cc? the PW at cranking isn't THAT high.

why not try to lower the req_fuel more and more until it starts. that will give you an idea if it;s the fueling or if something else is at play.


this is a mspnp2? do you have a vTPS? do they make any notes about not using the factory TPS?
THIS IS A DIY PNP 2 AND IT HAS E30 VTPS......
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Old 11-18-2013, 02:16 PM   #18
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also the injectors being bad really isnt a option keep in mind guys that this car runs and idles fine on the stock ecu.... just doesnt have a maf and struggles a bit because the 440cc on stock ecu with no maf lol
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Old 11-18-2013, 02:33 PM   #19
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Quote:
Originally Posted by slammedkouki View Post
When I go I to basic settings and fuel calculator I enter 1600cc in engine displacement. The go down to injector flow and enter 440 then click cc/min and burn it and it comes up with a calculated fuel number on its own? Is this wrong
Sorry, forgot it's a 1.6.....
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Old 11-18-2013, 03:09 PM   #20
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So I messed with a few more things.... I just can't get it to start on this megasquirt, I can like get it to fire for a second and it dies out..... So something in my tune is wayyyyyy off. I someone could look at that and let me know that would be awesome.... Also my injector should be unlimited fire? Or semi sequential?
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