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Old 10-29-2010, 11:25 PM   #1
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Default Do I have a bad MS?

Long story short, I've bolted on the turbo kit last year and the car has been down since.

Tied up with a purchase of the property, bikes and other projects the Miata has been more of less forgotten about after it failed to start with everything bolted on. However I can't stand to look at it anymore in the corner.

To get to the basics, here is the kit

Greddy 15G turbo from 1.6L Kit
ETD Racing 1.8L Greddy Conversion Manifold
Racing Mazda DP
2.5" "Test Pipe"
CX Racing Intercooler/Piping
Greddy Type S Knock-off
Flying Heatshield
RX7 460cc Injectors

Fuel management - Megasquirt built by Braineak
Wired for IAT, not MAF, with the basemap for the injectors.

I've had nothing but issues ever since, the car has not ran fine. This is what it sounds like now.



Sounds like a goddam cammed V8.

However here is the kicker. Even on bigger injectors if I put the MAF onto the turbine housing, put the stock ECU back on it sounds like this.



Which is more of less fine, especially considering stock map and bigger injectors.

Now the only things I can possibly think of is either the IAT is wired wrong, Megasquirt is made improper or one of the sensors isn't giving the MS proper reading - such as the IAT sensor.

Some detailed pictures of IAT plugs - I got a 1.8 motor, from what I've read I need to connect to the 3rd and 4th prongs in the MAF pigtail. Don't mind the ghetto connections, least of my concerns at the moment.

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Megasquirt harness.

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Any clues from the guru's?

Edit : I know about the blowby, at the moment I got bigger issues however.
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Old 10-30-2010, 01:16 AM   #2
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where are you located? Have you checked spark and fuel?
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Old 10-30-2010, 01:25 AM   #3
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Yes, verify spark and fuel on all four cylinders with the ms hooked up. IF the AIT is hooked up incorrectly, it won't run well. Your problem I THINK is that it's running on 2 or 3 cylinders. Is it a California car?
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Old 10-30-2010, 01:31 AM   #4
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Quote:
Originally Posted by Vovchandr View Post
Don't mind the ghetto connections, least of my concerns at the moment.
Go ahead and do it right. 2 minutes of work.

Check all Vac lines and make sure that the spark plug wires are in the correct order.

Edit: And verify injector wiring/firing order.



Firing order is 41 23. Switch the wires, try 23 41.

Last edited by turotufas; 10-30-2010 at 01:49 AM.
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Old 10-30-2010, 01:51 AM   #5
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NY car.

Firing order is proper.

The ONLY differences between second video where it runs relatively fine (it's been so long since it ran proper I dont remember what "fine" is anymore) and the first are change from stock ECU to MS and from MAF to IAT.

I'll look into the IAT sensor again and make sure all the connections are proper.

1.8 car, you connect to 3rd and 4th terminal on the MAF pigtail just as the picture shows, correct?

I'm getting spark and fuel if it runs with MS, but it does sound like it's only running on only 2 or 3 cylinders which leads me to believe that either something is going on with MS (which I'm pretty clueless about which is why I paid Braineak to build a PnP one) or MS is working proper but not getting proper reading from necessary sensors (which in this case only leaves the IAT.
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Old 10-30-2010, 05:15 AM   #6
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If you actually cared and provided us with a datalog of the problem, *maybe* it would be easier for us to help you.
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Old 10-30-2010, 06:11 AM   #7
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And check for spark and fuel, we need to know if all four have it. If not, we need to know which ones. For example, 1&3 not running is a fuel issue, where as 1&4 is a spark issue.
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Old 10-30-2010, 12:52 PM   #8
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Quote:
Originally Posted by Reverant View Post
If you actually cared and provided us with a datalog of the problem, *maybe* it would be easier for us to help you.
I have actually never connected MS to the computer.

I can clean the plugs, put them in again, crank it and see which ones get wet to check for fuel.
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Old 10-30-2010, 07:21 PM   #9
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Quote:
Originally Posted by Vovchandr View Post
I have actually never connected MS to the computer.
Then there is no way you could have properly sync'ed your MS to the actual ignition timing like you're supposed to do when you install it. Go read the SUPER Important Megasquit Threads, whip out your timing light, follow the instructions, report back.
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Old 10-30-2010, 08:01 PM   #10
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Quote:
Originally Posted by Vovchandr View Post
I have actually never connected MS to the computer.

I can clean the plugs, put them in again, crank it and see which ones get wet to check for fuel.
Sounds great. However, before putting them back in, clip them into the spark plug wires and lay them all on the valve cover. Crank the car and looking under the hood to see which ones are sparking. Then put them in and check for fuel.
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Old 10-30-2010, 10:44 PM   #11
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Quote:
Originally Posted by ScottFW View Post
Then there is no way you could have properly sync'ed your MS to the actual ignition timing like you're supposed to do when you install it. Go read the SUPER Important Megasquit Threads, whip out your timing light, follow the instructions, report back.
I guess I must have misunderstood the concept of PnP.

Thank you gentlemen. I'll report back.
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Old 10-31-2010, 12:05 AM   #12
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PnP is misleading, it is in no way Pnp. In fact no aftermarket ECU is.

It is PnT. Plug and tune.
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Old 10-31-2010, 08:35 AM   #13
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Your exhaust manifold is not sealed and you have checked the timing yet?
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Old 10-31-2010, 08:51 AM   #14
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Quote:
Originally Posted by Vovchandr View Post

Some detailed pictures of IAT plugs - I got a 1.8 motor, from what I've read I need to connect to the 3rd and 4th prongs in the MAF pigtail. Don't mind the ghetto connections, least of my concerns at the moment.

It's not the reason your car isn't running properly, but that still isn't right.

1.6 or 1.8 the IAT is still only a resistor, so there will only ever be two connections, NOT 3.

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