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Old 12-16-2011, 09:44 PM   #41
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Not the ignitor. I took my ignitor over to my friend's and threw it on his 1.6 and it ran just fine.
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Old 12-16-2011, 11:02 PM   #42
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One very easy thing to cross off would be reloading the firmware. Mine has been corrupted before without me touching anything, don't ask me how it was a mystery to me.
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Old 12-16-2011, 11:11 PM   #43
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OK, I just went out and did this:

Quote:
Originally Posted by rharris19 View Post
pull the cas, but keep it plugged in, and unplug the fuel pump relay under the dash. Then manually spin the cas and see if all of the injectors are clicking or if it is just 1&4. If it is just 1&4, then the problem is either the CAS or wiring going to the injectors.
Using a long screwdriver as my "stethescope", I am 90% certain that injectors 2 & 4 are NOT clicking when I manually spin the CAS by hand. It is hard to tell, because the clicking of a nearby injector transfers through the fuel rail to the others, but like I said, I'm 90% certain - there was a difference in the volume from 1&3 (louder click) than when I listened to 2&4 (probably just the noise from 1&3 which are working.

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Originally Posted by Savington View Post
I've seen a bad CAS drop cylinders 2 and 4 before.
Sounds like this could be the culprit?

My buddy with a miata is at a holiday party right now, but will try to swap in his CAS and find out. If the CAS is not it, what else could it be?

Last edited by ThePass; 12-16-2011 at 11:53 PM.
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Old 12-16-2011, 11:32 PM   #44
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Yup. Bad CAS or firmware issue. My guess is CAS
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Old 12-17-2011, 06:43 PM   #45
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The CAS is an optocoupler. So it could "slowly" die on you. You run a Megasquirt, right? Are you able to view the inputs of the CAS in the Tunerstudio diagnostics menu? That way you can check what's comming in.
You can also check the CAS by checking if ot goes to 0 Volts on the triggerwires. It should switch between 12 or 5 volts and 0 volts. You can turn it slowly by hand. Is the CAS clean inside? You can open it. It should be dry and there should not be any oil in there.
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Old 12-17-2011, 07:44 PM   #46
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Swapped the CAS with a working one. No change.

So, I had my buddy listen to the injectors with a stethoscope while I manually spun the CAS to verify that I wasn't hearing things - he confirmed that 2 & 4 weren't clicking.

We decided to swap in my OEM ECU instead of the Megasquirt. Guess what? HALLELUJAH! Even running without an o2 sensor and on NB injectors and a Walbro 255, it runs smoothly on the OEM ECU - the AFRs are a little off, but it is just fine.

So... firmware? What are the possible culprits within the Megasquirt? I could try to reload the firmware and if that doesn't do it maybe I need to send it in to DIYPNP...

-Ryan
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Old 12-17-2011, 07:53 PM   #47
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I'm guessing it's just going to need firmware reloaded. Congrats on at least narrowing down the problem, it's been a lot of guess work I bet you're stoked to actually know where the problem is.
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Old 12-17-2011, 08:11 PM   #48
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Quote:
Originally Posted by ThePass View Post
Swapped the CAS with a working one. No change.

So, I had my buddy listen to the injectors with a stethoscope while I manually spun the CAS to verify that I wasn't hearing things - he confirmed that 2 & 4 weren't clicking.

We decided to swap in my OEM ECU instead of the Megasquirt. Guess what? HALLELUJAH! Even running without an o2 sensor and on NB injectors and a Walbro 255, it runs smoothly on the OEM ECU - the AFRs are a little off, but it is just fine.

So... firmware? What are the possible culprits within the Megasquirt? I could try to reload the firmware and if that doesn't do it maybe I need to send it in to DIYPNP...

-Ryan
Mechanics stethoscope for the f'in win man. I am glad we finally narrowed it down.

Quote:
Originally Posted by wittyworks View Post
I'm guessing it's just going to need firmware reloaded. Congrats on at least narrowing down the problem, it's been a lot of guess work I bet you're stoked to actually know where the problem is.
That is what I feel it will need, interestingly you could see how the car was running mega rich and causing the sensor to read "lean" even though the opposite was occurring.
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Old 12-17-2011, 08:17 PM   #49
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Yeah I am incredibly relieved to have narrowed it down to one component. Even though it's the MS, which could suck if reloading the firmware doesn't fix it, I'm glad to have figured out what it is. I don't mind stuff breaking. I can repair/replace whatever it is. It's the whole replacing nearly everything in the fuel and ignition systems and still not knowing what it is part that was seriously eating at me
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Old 12-18-2011, 12:10 AM   #50
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Quote:
Originally Posted by ThePass View Post
Yeah I am incredibly relieved to have narrowed it down to one component. Even though it's the MS, which could suck if reloading the firmware doesn't fix it, I'm glad to have figured out what it is. I don't mind stuff breaking. I can repair/replace whatever it is. It's the whole replacing nearly everything in the fuel and ignition systems and still not knowing what it is part that was seriously eating at me
look at the bright side, now you know that stuff won't be breaking on you for a long time. And if it does, you have some half-used replacements sitting around which you can box up and bring along as replacements to get you home if anything was to happen.
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Old 12-18-2011, 08:14 AM   #51
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Your injectordriver in the MS may have failed.
Quite easy to test, harder to solve. You may wan't to have your MS looked at by somebody that knows what he is doing.
You might wan't to consider the 4 chanel sequential upgrade now you are at it.
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Old 12-18-2011, 08:48 PM   #52
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Quote:
Originally Posted by IHI View Post
Your injectordriver in the MS may have failed.
Quite easy to test, harder to solve. You may wan't to have your MS looked at by somebody that knows what he is doing.
You might wan't to consider the 4 chanel sequential upgrade now you are at it.
We reloaded the firmware this morning and this MS still didn't want to cooperate. Sounds like ThePass is going to send it to DIYAutotune.
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Old 12-18-2011, 09:27 PM   #53
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.
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Old 12-20-2011, 09:08 PM   #54
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^ most useful post so far
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Old 02-22-2014, 04:49 PM   #55
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Quote:
Originally Posted by IHI View Post
Your injectordriver in the MS may have failed.
Quite easy to test, harder to solve. You may wan't to have your MS looked at by somebody that knows what he is doing.
You might wan't to consider the 4 chanel sequential upgrade now you are at it.
I have a very similar issue going on with my car currently. I ordered a new fuel pump as Ryan did to eliminate the variable but I am concerned I am chasing the same type of issue. Luckily I stumbled on this thread.

How can I accurately test if the injectordriver is working correctly on my DIYPNP?
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Old 02-25-2014, 08:47 PM   #56
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Test mode On (output), and try them individually if sequential or in batch.
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Old 03-04-2014, 06:16 PM   #57
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Quote:
Originally Posted by joyrider View Post
Test mode On (output), and try them individually if sequential or in batch.
Thanks! Followed the instructions here:

MS2/Extra - Output Test

Tested each injector which seemed to work. Each one tested similarly with the settings recommended on the msextra link above.

I also installed my new fuel pump, but it didn't change a thing.

Next step is firmware upgrade from 3.1.1 to 3.3.1
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