91_miata

ok I have a ms2 that was built and modded by diyautotune. I have finally been able to get the car to start but it doesn't sound right at all, I had to go to wot to get it to start and stay running and it wouldn't go over 700 rpms. I was able to get it started a few times now it acts like its not getting fuel. I used a noid light on the injector harness its firing the injector and base fuel psi is 43psi when cranking

here is a video of what it sounds like


I have attached my msq, only thing that it isn't showing currently is I had to invert the spark to get it to start, it did get the cop pretty warm so I tried switching it back after It wouldn't start and I get spark at the plugs and I switched the plugs, but I really think there is something going on with my fuel settings that I cant seem to figure out im running Honda obd1 rc440 cc high imp injectors

91_miata

the car is open downpipe currently

curly

iTrader: (25)

Who timed the engine?

blaen99

iTrader: (6)

That engine is completely untimed.

91_miata

I put a new timing belt on it. It's perfect. I had to pull the cas to put a new o ring on it. I fried my stock ignitor so I had to put my cop setup on it. I can't use a timing light on it to set base timing. But even when playing with the cas it still doesn't seem to want to try and start anymore like it did in the video

tpwalsh

If you know your valve timing is good, then the next step is fuel and ignition. Get a timing light on it. (though how you do that with a COP setup, I don't know) That way you know your ignition events are happening in a timely manner on ALL cylinders. The video sounds like you're only running on 1 or 2.

Then play with your fueling to get it to idle.

91_miata

Ya it def doesn't sound like it giving full fuel to all cyclinders

Braineack

iTrader: (62)

youre running on 1 or 2 clyinders.

91_miata

Hmm. So it's mechanical and not in megasquirt? I was just trying to verify I had my ms setting all proper before I start running in circles. I have another set of injectors I want to try see if that helps any.

curly

iTrader: (25)

You can put a timing light on it. Just clamp it on over the wiring for the #1 COP.

Edit: not that'll solve your problem, but for future reference.

91_miata

Thanks! I will give it a try

hornetball

iTrader: (4)

It's still a wasted spark system, right? If so, and you're running on 2 cylinders . . . check COP wiring. Something might be swapped.

91_miata

All 4 cop are firing. Tested with Noid light. Seems like its a mechanical timing issue. I need to recheck it

bmxfuel007

iTrader: (21)

If you want to use your timing light (inductive) with your cop setup, I always used one of my old spark plugs wires to go from the #1 cop to the spark plug. It won't fire if you put he timing light sensor on the COP wiring before it's gone through the coil. If you're having problems having the wire stay in the coil, just get some tape. It's just temporary until you time it anyway

hornetball

iTrader: (4)

That's not what I meant. Of course all 4 cops are firing. The question is "WHEN" are they firing, near TDC or near BDC?

With a 4-cylinder wasted spark system, you basically have 2 firing events per revolution. On the Miata engine, one firing event should happen when 1 and 4 are near TDC and a second should happen when 2 and 3 are near TDC. Note that on each firing event, one of the pistons is near TDC of the compression stroke while the other is near TDC of the exhaust stroke, hence the term "wasted spark."

Anyway, make sure that the COPS for 1 and 4 fire TOGETHER and the COPS for 2 and 3 fire TOGETHER. If this isn't happening, you will run on 2 cylinders even though everything else is perfect.

91_miata

I will pull the cops out ad test them. Is there a fox of they are not? I followed the write up when I installed them

hornetball

iTrader: (4)

Just trace out the primary wiring. Make sure that the primary wiring firing COPS 1 and 4 are connected, and the primary wiring firing COPS 2 and 3 are connected. If they are, then the problem is elsewhere. If not and you have enough slack, you can just switch around the COPS to get them on the correct plugs. If you don't have enough slack, you'll have to do a bit of rewiring.

Link: https://www.miataturbo.net/attachmen...ine=1327066127

91_miata

So I found out that 1 and 4 are firing at the same time. 2 and 3 are not. While I was tested my number 3 I could here it has a internal issue. It was firing inside the cop So I'm off to the yard Saturday to get another one