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Old 09-18-2016, 06:51 PM   #1
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Default 1990 with 2003 VVT no rpm when cranking

I just finished swapping a 2003 VVT engine with a MKturbo kit into my 1990 miata. I am using all the VVT engine sensors as well as the newer ignition coils. I can't seem to get a crank or cam signal while cranking. Tuner studio says not RPM synced. I loaded a basemap for a 2001-2005 vvt engine. The engine cranks, but I get no RPM in tunerstudio while cranking. I tested coils in output mode and they are definitely sparking. I am getting power for the cam and crank sensor from the CAS plug that I am no longer using and power is there when cranking and with key on. I grounded the sensors at the back of the intake manifold, should they ground straight to the megasquirt instead? The signal wire for the crank sensor is connected to 3M on the megasquirt connector and cam sensor signal is connected to 3O on the megasquirt connector. I used the pinout that is located here MegaSquirtPNP by DIYAutoTune.com
Maybe I'm looking at the pinout wrong? Am I supposed to be looking at the back of the connector where the wires connect when it says 3M and 3O or am I looking at the connector on the ECU itself? I want to get this running for MRLS in two weeks! Hopefully someone more knowledgeable than I can chime in and assist me with this issue.

Thanks,
David
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Old 09-19-2016, 01:04 PM   #2
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Please post a copy of your tune file and a composite log of an attempted start. This will give everyone more to go on.
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Old 09-19-2016, 01:13 PM   #3
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Matt thanks for the reply. I ended up figuring out what the problem was. Well actually there was more than one problem. First I had to gap the crank sensor correctly, I left enough room to slide a business card between the trigger wheel and the crank. After that I was able to get signals in the composite log. The second problem, and I feel stupid for breaking my head over this one all day yesterday was that I forgot to connect the ground for the coil packs. I tried so many things and it turned out to be that dumb problem. So lesson learned, don't just double check your connections, triple check them!

-David
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Old 09-19-2016, 01:29 PM   #4
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I generally use a credit card to set my crank sensor distance. Make sure the 10mm bolt you use to bolt in the crank sensor is long enough. I once used one that was just long enough to thread some, but not really hold. Started getting cut outs of the engine while driving. Pulled over and had to swap bolts in a neighborhood to get the car back home.
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Old 09-19-2016, 02:11 PM   #5
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Quote:
Originally Posted by shuiend View Post
I generally use a credit card to set my crank sensor distance. Make sure the 10mm bolt you use to bolt in the crank sensor is long enough. I once used one that was just long enough to thread some, but not really hold. Started getting cut outs of the engine while driving. Pulled over and had to swap bolts in a neighborhood to get the car back home.
Thanks, I will adjust it today after work. It still hasn't been driven, I need to put oil in my transmission and differential. Also need to do a bit of tuning on the base map. It looks like I can pull timing on a large chunk of the spark table. This is a JDM vvt engine with a flattop and if I'm not mistaken it has 10.5:1 compression ratio. How much boost would you say is safe to run on this engine? It is very low mileage, around 40K and is not built, aside from a skunk2 throttle body it is stock. I am using EBC as well, but it needs to be tuned also. I've been learning a lot as I go. Thanks for the reply guys!

-David

Last edited by konmo; 09-19-2016 at 02:15 PM. Reason: typo
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Old 09-19-2016, 02:21 PM   #6
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You can probably run 12-15psi on the motor. It has the same rods as all other motors and they bend around 225-250ft/lbs of torque. The one thing you will have to watch out for is your timing map since you have the higher compression pistons. Other then that tuning will be the same as any other setup.
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