LostinSpace2000

Hello Kitties!

My issue is that I had my car idling and running but then I accidently overwrote my current tune with a different tune (Dumb mistake I know) and now it just cranks and crank with the occasional very loud backfire

I started by loading the 1.6 Miata basemap from megasquirtpnp and configured the IAT Sensor to GM and configured the AEM Wideband by setting it to Custom Linear WB and setting two volt points(1.0 and 4.0)

I also changed the required fuel based on my injectors and engine size.

Background info:
93 Turbo 1.6 (Still 1.6 Manual TPS)
GM IAT
AEM Wideband
MSPNP2
FlowForce 640cc Injectors

Things I have tried/noted:
Double checked mechanical timing of the engine and the cam gears and cams are oriented correctly with the correct timing marks
I have swapped 3 different coil packs that I had laying around with no such luck.
Tried different spark plug wires
Pulled spark plugs and cleaned them as they were very dark
Rotated CAS as well as adjusted the timing offset in MS from -20 to 20 at different amounts.
Drained gas tank and filled with fresh 91 octane (Was sitting over winter)
Replaced Fuel filter
I do hear the fuel pump turn on when turning the key to the key on position
Cleaned grounds on back of intake manifold
Used timing light and verified spark (flashing light)

The datalog seems to report Engine RPM, Fuel, and Spark unless I am reading that incorrectly.

Attached is a datalog during cranking as well as my current tune

Any help would be greatly appreciated!

Thank you so much!

U2IK67NU1VLKJ0

The cranking and popping symptoms sound like ignition timing could be off by 180 degrees. eg. Recheck if cables aren't wired opposite for example.

LostinSpace2000

Tried it a week later when it was warmer out and it started right up, I am guessing maybe just needs tuned out especially during colder weather

L337TurboZ

iTrader: (1)

Check your battery voltage and health. If the car has sat over the winter and not enough amperage is there to really get the engine spinning fast enough then it could cause the issue you were having when cold.

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