No start after plug change
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Like it says in the title. I put new plugs in my turbo 01, like I've done a hundred times. To start my never removed ngk blue wires shed it's rubber grommet, on the plug end. I had an extra wire.
When I put it together, it wouldn't start. Tuner Studio is reading rpms but they stay at 0 on the dash.
How do I check voltage at the coil plug? Isn't there supposed to be 5v at the terminal, with the key turned on. Its Christmas so I can't get anyone to help me. To see spark etc. Any ideas what to look at. I even put the old plugs back in.
When I put it together, it wouldn't start. Tuner Studio is reading rpms but they stay at 0 on the dash.
How do I check voltage at the coil plug? Isn't there supposed to be 5v at the terminal, with the key turned on. Its Christmas so I can't get anyone to help me. To see spark etc. Any ideas what to look at. I even put the old plugs back in.
#2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I get 12v at the terminal end, by the coil, with the ignition switch on. Should I be getting another signal, or is that only when it fires?
I put a cam sensor in, because I had an extra. Plugs are black and sooty.
Checked room and engine fuse. Cracked main trying to pull it to check, but I think it's ok for now
I put a cam sensor in, because I had an extra. Plugs are black and sooty.
Checked room and engine fuse. Cracked main trying to pull it to check, but I think it's ok for now
Last edited by joe morreale; 12-25-2022 at 11:43 AM.
#3
Cpt. Slow
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,360
Total Cats: 1,184
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
If the ecu is on, you’ll hear the fuel pump prime, and/or be able to connect via laptop. Once connected, you can test coils and injectors in test mode. That’ll verify all wiring, so it’s easier and quicker than checking with a multi meter.
I’d double check everything you did. more than likely you unplugged or bumped something. TS will read RPM while cranking. If it reads 0 while cranking, you have a crank sensor issue or similar.
I’d double check everything you did. more than likely you unplugged or bumped something. TS will read RPM while cranking. If it reads 0 while cranking, you have a crank sensor issue or similar.
#4
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got cold feet playing with this **** box outside. I tested the coils. Everything is sparking.
When I did an injector test injector h did not click, which surprised me because the car seemed to be running well. Does that sound like I need to go into the fuel rail and check the electrical connection, or see if it's clogged? I should get the car running on three cylinders first.
The fuel pump turns on but the plugs stay dry. I'm getting an rpm signal in tuner Studio. When I take a composite log, I get nothing. I've had the car twenty years without issue, so this is annoying.
Any other ideas are appreciated. I can replace broken stuff, but I'm terrible at diagnosing. All sensor plugs are right. No fraying on crank sensor wires. Gap is tight.
When I did an injector test injector h did not click, which surprised me because the car seemed to be running well. Does that sound like I need to go into the fuel rail and check the electrical connection, or see if it's clogged? I should get the car running on three cylinders first.
The fuel pump turns on but the plugs stay dry. I'm getting an rpm signal in tuner Studio. When I take a composite log, I get nothing. I've had the car twenty years without issue, so this is annoying.
Any other ideas are appreciated. I can replace broken stuff, but I'm terrible at diagnosing. All sensor plugs are right. No fraying on crank sensor wires. Gap is tight.
#7
Cpt. Slow
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,360
Total Cats: 1,184
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got cold feet playing with this **** box outside. I tested the coils. Everything is sparking.
When I did an injector test injector h did not click, which surprised me because the car seemed to be running well. Does that sound like I need to go into the fuel rail and check the electrical connection, or see if it's clogged? I should get the car running on three cylinders first.
The fuel pump turns on but the plugs stay dry. I'm getting an rpm signal in tuner Studio. When I take a composite log, I get nothing. I've had the car twenty years without issue, so this is annoying.
Any other ideas are appreciated. I can replace broken stuff, but I'm terrible at diagnosing. All sensor plugs are right. No fraying on crank sensor wires. Gap is tight.
When I did an injector test injector h did not click, which surprised me because the car seemed to be running well. Does that sound like I need to go into the fuel rail and check the electrical connection, or see if it's clogged? I should get the car running on three cylinders first.
The fuel pump turns on but the plugs stay dry. I'm getting an rpm signal in tuner Studio. When I take a composite log, I get nothing. I've had the car twenty years without issue, so this is annoying.
Any other ideas are appreciated. I can replace broken stuff, but I'm terrible at diagnosing. All sensor plugs are right. No fraying on crank sensor wires. Gap is tight.
I should also ask the basic questions, what car is this, what ecu is it?
#8
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I should have started with this. The car is a stock block 01, with a mk turbo kit. MS3 basic by Reverant. I googled how to do a composite test. I'm still getting nothing. I tried a trigger tooth test and a single line showed up. The injectors fired on e,f,g,h in tuner studio, in test mode. In general settings the car is set up to run on a,b,c,d. A,b,c,d get no response when doing test mode. I checked fuel pressure, just for ***** and giggles, and it was 60 something at the rail. I double checked all wiring and grounds to see if I knocked something loose. Everything is tight. Do I start throwing parts at it? Like a crank sensor? The cam sensor is new. Lastly is there a possibility that my MS has taken a ****?
#10
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I looked everywhere I could think of, and I couldn't find where to reassign the injectors. I think there's some data on the composite logs that I can't read. It shows that it has something in the file, anyway. I had two that were empty files. I attached the two logs that seemed to have data. Maybe you could make sense of them. I also attached my tune. I'm not ready to burn this bitch yet, but I'm looking for a gas can!
#11
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Metalogger wouldn't read my composite logs. I put a new crank sensor in just for the hell of it. Tried pulling the main relay, with the key on and injectors click. I can only assume at this point the megasquirt **** the bed. I'm going away for two months, so sending out to get checked and hopefully repaired is not time sensitive. It's a reverent unit. There's a guy here in Florida, Merritt Island that supposed to repair them. I hope to get it sent out before I leave Tuesday.
#13
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Just heard back from Linfert Performance, who has my ecu. It's fried. He said if it's the daughter board, he can fix it. If it's the motherboard, I have an expensive paperweight. Waiting to hear results. I wonder if there was anything I could have done while changing plugs to cook it. The keys were out of the ignition. I'm going to owe a bunch of money for taxes this year. I hope I don't have to buy a new unit. I can barely solder 2 wires together, so making my own is not an option.
#16
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,987
Total Cats: 359
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I don't know who Linfert is but your 2016 ECU is definitely not a paperweight. Get it back, email me and I will help you fix it for free (ie remotely with advice), email us pictures of the green board (email address is on our web site) and I will advise further.
#18
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I'm back again. After confirming that my ecu was unrepairable I bought a new MS3 PNP. When I first installed it the fuel pump relay was bad, so I replaced it. I also put a new cam sensor on it.
My issue now is no spark. If I stick a plug into a wire and ground it, I see spark. When I tried to hook a timing light on it I couldn't get anything. If I use tuner studio to activate a spark in can bus mode, I don't get any spark. I do here clicking, which I believe is from the coil. I've tried all wires with the timing light and with the same result. I've come to the end of my very limited knowledge. I'm asking anybody out there to look at my tune, log cranking and composite log cranking, to see if they can come up with any reason to explain why I'm having this issue. Car has been down for over two months and I need to get it running before I go nuts.
My issue now is no spark. If I stick a plug into a wire and ground it, I see spark. When I tried to hook a timing light on it I couldn't get anything. If I use tuner studio to activate a spark in can bus mode, I don't get any spark. I do here clicking, which I believe is from the coil. I've tried all wires with the timing light and with the same result. I've come to the end of my very limited knowledge. I'm asking anybody out there to look at my tune, log cranking and composite log cranking, to see if they can come up with any reason to explain why I'm having this issue. Car has been down for over two months and I need to get it running before I go nuts.