OK I've posted this on the UK MX5Nutz forum but thought I'd also post it here as you guys have done more VVT swaps.:-
Ok so the VVT engine is in, all the wiring is done, (correctly I think), a few settings changed on my Megasquirt from its previous 1.6 configuration, but the engine won't start... ):
Basically it tries to turnover, I have fuel and spark on all cylinders, (defiately spark) but the timing is way out. I get occasional bangs out the exhaust or bangs through the intake if I have the throttle open...!!!
Here is what I have done so far with the install:-
I am using the VVT Crank and Cam sensors which have been wired into the original MK1 Cam sensor wiring like so. http://www.miataturb...ing_1-6_vvt-jpg
However the wiring on my VVT sensors was Black/Blue, (Violet White or Grey/Blue for signal), and Black, (Not White/red like the diagram). I therefore wired the black wires as +12V positive to the wire/red on the 1.6 harness.
The original trigger plate on the crank pully was damaged, (one of the nubs on the plate was bent), so I replaced the crank pulley complete with a trigger plate which I took from a MK2 engine.
I am using the VVT coils which I have wired into the 1.6 harness by gutting the original ignitor and soldering the VVT wires to the pins like this:- http://www.miataturb...p_schematic-jpg
Except I have only earthed the coils to the head and not the old ignitor as well and there is also no tach output from the VVT coils, (am using the ECU output to rev counter). I am definitely getting a spark from all 4.
I have re-wired my injector harness from batch to sequential. Pretty sure I have done this correctly and I have fuel going into the engine hence the odd bang when cranking.
I have made the following changes to my Megasquirt ecu from its original MK1 1.6 settings:-
Re-calibrated Throttle position sensor
Changed required fuel to 11.6.
Changed injection to sequential
Imported a new VE table base map from Reverant for a VVT engine.
All other ECU settings are as per 1.6 map, (AFR table, ignition table, cranking settings etc).
I have re-set the Trigger angle offset back to 0 from 2.6 that was used on the 1.6 engine.
Am I messing anything obvious?
Could the crank sensor have been knocked slightly out of position when the engine was removed/palleted/installed and if so how can I check?