if your megasquirt only ran on 2 cylinders, what would you check? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-10-2011, 07:37 PM   #1
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Default if your megasquirt only ran on 2 cylinders, what would you check?

for real.


cause mine only fires on one and four. there's fuel on two and three, but no spark (verified via timing light). all four fire on the stock ecu.
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Old 05-10-2011, 07:52 PM   #2
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Is this a new ECU or a new problem on an old ECU? The first thing I would check is the coils. It'd be pretty easy to swap them and see if the problem swapped cylinders or not.
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Old 05-10-2011, 07:54 PM   #3
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Quote:
Originally Posted by pdexta View Post
Is this a new ECU or a new problem on an old ECU? The first thing I would check is the coils. It'd be pretty easy to swap them and see if the problem swapped cylinders or not.
its a new ECU. since the car runs fine on the stock ECU, i dont think its the coils.
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Old 05-10-2011, 08:25 PM   #4
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details on the ecu, did you build it? did you buy it used?

could be alot of things even software, post up your MSQ and the details on where it came from what options it has ect.
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Old 05-10-2011, 08:38 PM   #5
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Quote:
Originally Posted by MD323 View Post
details on the ecu, did you build it? did you buy it used?

could be alot of things even software, post up your MSQ and the details on where it came from what options it has ect.


brain built MSII w/launch control, bought it new from Scott. MSQ attached
Attached Files
File Type: msq 2011-04-07_18.36.37.msq (79.1 KB, 110 views)
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Old 05-11-2011, 12:09 AM   #6
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Switch the coil outputs, so the 1&4 signal fires the 2&3 coils. If it does actually do this, than it is indeed the MS, and not anything between the MS and the coil. Don't always blame the MS.
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Old 05-11-2011, 02:15 AM   #7
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One of the transistors that controlled 2 injectors had the legs bridged on my MS. Yeah, it took quite some time to find this.
DSC_0054.jpg?t=1305090889

Also, what Curly said. I swear every time I have my engine out for a significant period of time I route the plug wires incorrectly and spend hours trying to figure out why its only running on 2 cylinders with soaking wet plugs.

Last edited by Bryce; 05-11-2011 at 02:35 AM.
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Old 05-11-2011, 07:49 AM   #8
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Quote:
Originally Posted by curly View Post
Switch the coil outputs, so the 1&4 signal fires the 2&3 coils. If it does actually do this, than it is indeed the MS, and not anything between the MS and the coil. Don't always blame the MS.
I dont understand how this is going to help. I know that the coil will send a spark and fire cylinders 2 and 3 on the stock ECU, and not the MS. How could it NOT be a problem with the megasquirt?
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Old 05-11-2011, 07:53 AM   #9
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Ah, I must of skipped over that part. Sorry, next time I won't contribute. So all you're doing is unplugging the stock ecu, and plugging in your adapter harness and MS?
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Old 05-11-2011, 09:26 AM   #10
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pop the cover and look at the 4 holes next to the word BOOT



follow the wires on IGN1 and IGN2 and tell me where each goes.
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Old 05-11-2011, 10:29 PM   #11
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Quote:
Originally Posted by Braineack View Post
pop the cover and look at the 4 holes next to the word BOOT



follow the wires on IGN1 and IGN2 and tell me where each goes.
i have an MS2, and board looks nothing like that. i dont see anything labeled ign
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Old 05-11-2011, 11:09 PM   #12
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Take pictures of the top and bottom of your board, especially the prototype area, and post them up.

Have you tried just reflashing firmware and .msq? I've had that clear up strange issues multiple times.
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Old 05-11-2011, 11:17 PM   #13
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Quote:
Originally Posted by wayne_curr View Post
Take pictures of the top and bottom of your board, especially the prototype area, and post them up.

Have you tried just reflashing firmware and .msq? I've had that clear up strange issues multiple times.
yea i upgraded to the newest firmware, and reflashed the msq


how do i get the bottom cover off?
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Old 05-11-2011, 11:18 PM   #14
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Quote:
Originally Posted by curly View Post
Sorry, next time I won't contribute.

i wasnt trying to be a dick. sorry if i came off that way
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Old 05-12-2011, 12:53 AM   #15
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I'm glad you posted this as I'm having the same problem.

I'm running COPS though, with a harness that worked on the old MS1. Even ran temporary dedicated wires to my triggers and no dice...
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Old 05-12-2011, 09:47 PM   #16
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Quote:
Originally Posted by DrewLGT View Post
yea i upgraded to the newest firmware, and reflashed the msq


how do i get the bottom cover off?
Take the little nuts off that are on the serial connectors, remove the bottom screws and slide the board out.
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Old 05-12-2011, 10:18 PM   #17
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Quote:
Originally Posted by wayne_curr View Post
Take the little nuts off that are on the serial connectors, remove the bottom screws and slide the board out.
thanks
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Old 05-12-2011, 10:29 PM   #18
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I would check that my double dong wasnt in the runners.


Sorry I am drunkish.
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Old 05-12-2011, 10:29 PM   #19
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Name:  DSC00718.jpg
Views: 37
Size:  193.5 KB

Name:  DSC00716.jpg
Views: 36
Size:  236.5 KB
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Old 05-12-2011, 10:31 PM   #20
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Quote:
Originally Posted by Faeflora View Post
I would check that my double dong wasnt in the runners.


Sorry I am drunkish.
my double dong is in my ******* where it belongs.

Last edited by DrewLGT; 05-13-2011 at 07:49 AM.
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