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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 |
Originally Posted by slammedkouki
(Post 1074159)
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 |
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.... |
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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you're injecting too much fuel. Tell the MS to inject the right amount of fuel.
in other words: tune. |
^^ 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. |
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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no it's not.
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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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you certain the MAP sensor is plugged it? what basemap? what other tuning for fueling/cranking have you done?
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heres the datalog....
2 Attachment(s)
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...
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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? |
Originally Posted by Braineack
(Post 1074359)
you certain the MAP sensor is plugged it? what basemap? what other tuning for fueling/cranking have you done?
DIYPNP MegaSquirt installation for the Mazda Miata |
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. |
3 Attachment(s)
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... https://www.miataturbo.net/attachmen...ine=1384797843 THERES.... https://www.miataturbo.net/attachmen...ine=1384797843 https://www.miataturbo.net/attachmen...ine=1384797843 |
current tune.....
2 Attachment(s)
here it is.....
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Originally Posted by Braineack
(Post 1074366)
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? |
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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Originally Posted by slammedkouki
(Post 1074352)
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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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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