02-24-2014, 01:45 PM
Join Date: Jun 2009
Total Cats: 0
1999 Miata / new DIYPNP - runs as stock - pops but won't start with DIYPNP
Hi - I am new to the MS2/Extra world.
I have a 1999 Miata with MAF delete / GM IAT - just built a DIYPNP.
I carefully followed the instructions...I think that I have all of the connections where they go, but I do not know how to prove it...
I just took the car out in stock format to get a 12-month leading emissions test, so it had run the same day before the computer transplant.
I loaded the 3.3.0 firmware, with the starter msq tune for the 99-00 miata.
I calibrated TPS, CLT, IAT, and AFR linear equation.
MAP shows something like the correct pressure.
CLT, IAT seem to read correctly sitting cold.
I can get some very occasional popping after a lot of cranking.
Per the MS2 / Extra tuning page, I started messing with the cranking pulse width and the afterstart ratios.
Never have gotten a really convincing set of firing, though.
I read some posts here with some interesting finds - could I have a bad connection [crank sensor? cam sensor?]
I noticed that the starter tune did not have an accurate fuel demand and did not have the engine size correct. There were also no values for injector size, so I fixed that. I will eventually drop in my larger injectors, AFTER I get the motor to run.
I am attaching three cranking logs and my latest modified starter tune [can it be called a tune if it does not run?].
I would GREATLY appreciate some assistance in getting through the frustration of trying to get the car to run.
Is there someone's NB msq that I can load [setup for stock condition] to rule out that it is a software issue?
Some questions since I am a newb here -
Why is the CLT temp spiking?
Am I somehow trying to start on the prime pulse?
How can I prove that I have power supplied during cranking? I think that the popping proves that I have fuel..
Big thanks in advance...your help is really appreciated!