Crank but no fuel or spark, MSPNPPro
 

I'm out of things to try, and have started to lose hope and patience for my project. Any other ideas of things to check?

Configuration:
Vehicle: Exomotive Exocet Sport
Harness: 99 body and engine harness, greatly cut down for use in my Exocet. 99 donor ran and drove fine for 18 months before I stripped it down. VVT COPs have been re-wired to 99 harness coil wires. VVT solenoid is not yet wired to the MS.
Engine: JDM BP6 VVT engine
ECU: MSPNPPRO99-00
Injectors: GT500 w/ FlowForce install kit. Using the Exomotive fuel kit, which replaces the hard lines w/ -6AN lines.
2 gallons of fresh 93 added to tank last night before trying to fire it up

Situation: turning the key powers the starter and causes engine to turn over, but there is no combustion. Pulled a spark plug out to verify no spark, and the fresh spark plugs are not getting wet from fuel. TPS and coolant temp sensor are passing correct values to TunerStudio, but RPMSs are showing as 0. Tried multiple logs during cranking and none recorded any data.

Troubleshooting done so far: traced back wires for ignition coils, #4 injector, fuel pump, and cam sensor. Verified that all connections are getting 12V and the grounds are all common to chassis and engine ground points (I have rivnuts for 3 chassis grounds (one by fuel pump, one each on passenger and driver side of car. Removed enough systems (lights, windows, stereo, HVAC, windows, door locks, defroster, wipers, etc.) that I consolidated 2 grounding points on the driver's side), engine ground next to dipstick is currently grounded to same place as the driver's side ground, and signal wires for ECU for these circuits are continuous to the ECU pins. Verified signal wires for cam and crankshaft sensors are 5V on the harness side, and moving something ferrous past the sensor causes the voltage to change from 5v to 1.75v, which as far as I can tell indicates those sensors are functioning properly. Verified correct orientation of the crank trigger wheel. Tried basemaps from DIY for both the 99-00 and 01-05 MSPNPPro. Tried a new crankshaft sensor, which gave the same results in a manual test as the original sensor.

sounds like wiring from crank/cam sensors to ecu
if you can't get crank/cam signals in ecu, car will never fire
that would be the 1st thing to figure out

I traced both wires back to ECU and they are continuous. They also are both getting 5V from the ECU, which changes to 1.75V when waving a piece of steel in front of each of the sensors.

Also, I have removed all the wiring for the stock gauge cluster, as I will be running a Dash2 via CAN from the MS. Is there something in the cluster that would keep an engine from starting if the cluster is completely removed? The wiring diagrams didn't seem to indicate any issues when I was purging the body harness.

So if theyre getting power from ecu how come you dont get crank/cam signals?
perhaps you have the wrong ign trigger settings?

I have started an nb without cluster in place before

Ignition settings are the default 99-05 miata settings in the stack basemaps downloaded from DIY (megasquirtpnp.com). If I knew why it wasn't coming through I wouldn't be bothering everyone by posting here ;-)

don't think the trigger settings are same for 99-05
should be 99-00 and 01-05

but I could be wrong on that

Have you taken a composite log of trying to start? Not sure if you posted one in the other thread or not.

pretty sure he's saying he did and got nothing for either of the sensors

Correct. I attempted a composite log, as well as a couple other log types, and none recorded anything.

when you say "anything" you mean nothing at all? or no data from those two sensors?

cause if you got nothing at all, then you got a much bigger problem than just the cas

So when looking at the composite log tab and trying to start the car you get nothing going across the screen? Not even with it set to save the log?

Correct - nothing scrolls across the screen

Just throwing out idea's, what if you throw stock injectors back in and throw in the stock ecu. Then see if it starts or not.

I was about to suggest that too but he gutted the wiring and re-wired 01 cops onto it

I mean the stock ecu only needs so much to get the car started, would throw CEL's and shit, but assuming injectors/spark and cam/crank, and coolant are wired in. I would think it would start.

maf too

Ohh, yeah forgot about that thing. That could definitely cause some issues.

I tried stock BP4W ecu, no dice there either. I think my next step is to re-trace every wire in the engine harness to make sure they are still getting a good connection.

Also had the MAF hooked up when trying the stock ECU. Per the instructions for the MSPNPPro, the MAF is un-needed.

Continuity tested all the pins for the following to the ECU plugs, all were continuous and pinned correctly (I haven't taken anything out of the engine harness, only wiring change has been cutting the wires for the 99 coil packs and splicing in those from the NB2):
cam sensor
crank sensor
fuel injectors
coil packs
IAT sensor
coolant sensor
knock sensor

Took it all off the car to do from the comfort of my living room, so haven't re-installed yet (not that I expect anything to change when I do since I haven't done anything).

Reinstalled harness today. Ground powdercoat off 2 sides of a tube and drilled a hole through for a bolt for the dipstick ground, which I replaced with a big ground cable (4 or 2ga, can't remember). I also linked this ground to the 2 junction grounds with 10ga wires and ring terminals, and linked the other 2 grounds with another section of 10ga. I also ran a 10ga from the pass side ground junction to the intake manifold. Verified the 2 grounds near throttle body are properly secured. Put in the key, turn it, and still only turning over with no spark or fuel. Nothing registering for RPMs on Tuner Studio nor showing up on a composite or trigger or tooth log. Coolant and TPS do register in TS.

Hang in there man, it's always some stupid little insignificant thing causing the problem. I've cut down several wiring harnesses and always had issues afterwards that I eventually figured out.

It's probably not your issue, but I had one miata I deleted a lot of wiring from that would run fine in neutral, but died immediately when I shifted into gear. Are you cranking the car in gear? If so, maybe throw it in neutral and see what happens? That issue ended up being a ground wire I'd cut out, it took me forever to find it.

I'm sure it's one in a million that you have the same issue. Wish I could offer more constructive advise, but I felt like I had to throw it out there. Best of luck to you.

After talking w/ Peter Florance (not sure if he is on here?), he said to crank for 20sec to get a composite log. So I tried that, but actually failed to click start on the log as I was watching the clock. So I tried again, and after about 5s of cranking it fired up! Not sure what the deal was, fuel pump had fully primed multiple times prior to yesterday, but it then fired again after a couple rotations, so I will take it. Decided to stop there last night, now have a laundry list of other things to finish on the car, hoping to have it driveable this weekend so I can do a little street tuning and maybe get dome dyno time scheduled.

Thanks everyone for the help, and to anyone who may read this in the future, try letting it crank longer. 20s seems like a *long* time.

Checked your fuses? Seems stupid but you never know right? good luck :)