Microsquirt no start condition

maisonmays22 · Nov 11, 2019

New to microsquirt and still learning. I installed the microsquirt and wired the MAP sensor correctly with a vacuum from upper manifold. I changed the engine and injector size to the correct cc. Installed the LC-2 wideband and guage, everything is working correctly there. Timing is at or around 10, kind of hard to tell without it running. Is there anything i need to check or change before getting this thing to fire off? When I crank it, there is no sign of combustion until it loads up and backfires.

a91what · Nov 11, 2019

What tune file are you running off of? I assume one supplied by EFI source if this is the plug and play one they sell. Was the engine running before the installation?

maisonmays22 · Nov 11, 2019

Yes im using the tune that came on the PNP. No, it was not. So this could be a number of things. I just installed a 408w in place of the stock 5.0.

a91what · Nov 11, 2019

ok do you get an rpm input in tuner studio while cranking?

maisonmays22 · Nov 11, 2019

a91what said:
ok do you get an rpm input in tuner studio while cranking?

I didn’t check that. I was reading that on some diy pages. I’ll check it tonight when I get home and try it again

a91what · Nov 11, 2019

ok grab a datalog of the start attempt as well, if nothing else i can tell you if the sensor inputs are reading correctly.

my thought is the distributor may be 180* out if you are getting RPM input

maisonmays22 · Nov 11, 2019

a91what said:
ok grab a datalog of the start attempt as well, if nothing else i can tell you if the sensor inputs are reading correctly.

my thought is the distributor may be 180* out if you are getting RPM input

Okay. I’ll post in this later this afternoon.

maisonmays22 · Nov 11, 2019

So, watching my rpm gauge it is only showing around 150 rpm while cranking which it is moving faster than that. This may be my problem? The Microsquirt not recognizing a startup condition? how do I change this?

a91what · Nov 11, 2019

I'll look when I get home, but 150rpm is fairly normal cranking speed.

Put a charger on it.

What is the afr read when you stop cranking? Pull a plug and make sure they are not fuel fouled, if they have color post a pic

maisonmays22 · Nov 11, 2019

a91what said:
I'll look when I get home, but 150rpm is fairly normal cranking speed.

Put a charger on it.

What is the afr read when you stop cranking? Pull a plug and make sure they are not fuel fouled, if they have color post a pic

AFR stays at 7.4... I guess i need to calibrate it.

maisonmays22 · Nov 11, 2019

Just pulled a spark plug. It was wet so they are fouled.

a91what · Nov 11, 2019

Ok pull them and dry them off, the car has too much fuel. Please post full engine specs and tune file used.

When it does not start or fails to fire it is best to flood clear after 5 seconds of cranking. To do this simply mat the throttle to the floor and crank to disable the injectors

maisonmays22 · Nov 11, 2019

Ford 408 Windsor flat top pistons e303 cam making 512 lift in intake and exhaust. gt40x heads 63cc combustion chambers, trickflow intake for 351w, has a 70mm throttle body on it but planning on changing to 80mm.

a91what · Nov 11, 2019

What injectors? Not just size make as well

maisonmays22 · Nov 11, 2019

Ford performance 42lb

maisonmays22 · Nov 11, 2019

Cleaned off the spark plugs and tried again, I got more firing but most of them sounded like off timing. Tried the other TDC timing and got the same results, a bunch of backfiring and nothing that sounded normal

a91what · Nov 11, 2019

Ok so I went in and changed a few tables to suit your build. I also fixed the injector dead time settings. when you attempt to start the engine this time i want you to datalog the attempt for me so i can see what is going on. Make sure you have calibrated the sensors in the tools menu at the top of the screen this is imperative for successful startup.

maisonmays22 · Nov 11, 2019

Thank you, Ill give this a shot and ill get back to you tomorrow.

maisonmays22 · Nov 12, 2019

So, I verified the timing at 10 degrees. Verified the wires are correct. Flashed the tune you sent me. Calibrated the sensors maybe correctly... and still got the same results. I am going to get some new spark plugs and cables because im thinking there might be a bad connection somewhere with them. I attached a datalog of the attempt again. Let me know what you think a91what

a91what · Nov 12, 2019

You have verified timing at 10* how? I ask because there is only one way to set timing in MS for your install.
During these start attempts do you have the spout connector in place or removed?

Microsquirt no start condition

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