Hi Everyone,

Having a spark issue after installing Megasquirt and was suggested to post in this section..

UPDATE: Megasquirt, wideband, and everything else re-installed (suggested by other members). Car just cranks, but won't turn over.
I posted the current tune in a reply down below, but i will re-post it up here when i get home tonight


Long version - scroll down for "straight to the point" version lol
I drive a 1991 Miata SE with 90,xxx original miles. It was running good until I tried to install an Innovative wideband (DB Series Wideband Kit - Blue
Part #: 3795) and MegaSquirtPNP G2 ECU at the same time. Followed the instructions for everything the way they read, but after installing the required maps/settings after all was done, the car would turn over, but it would have trouble staying on and just die down. It would also drain my battery for some reason and i eventually had to keep using jumpers to another car every time. After trying to adjust the timing and what not in the Megasquirt program, timing belts, new fuel components, i gave up and completely removed ALL wiring and components (like O2 that came with the wideband kit, replaced oem ecu, etc..) and put everything back stock.
At first i had to jump the car but eventually the battery charged up a bit. It would just crank and not fire for a while and eventually after replacing the parts below (most parts suggested by others and some searching but problems is still here obviously) the car now turns on and will idle about 900 but not steady. It feels like its a cammed rotary motor. Like the video below, if i remove spark plug wires # 1 or #3 the car still stays on and runs the same but if i take out #2 or #4 the car shuts off. Checked the spark by simply pulling the wire out slightly and realized 1 and 3 have very little to no spark and 2 and 4 have strong spark. Also after leaving it running for a bit (more that 5-10 min) the car will begin to leak coolant looks like out the cap and the middle parts of radiator. Like i said i'm not sure what it could be just need some advise. I've been researching for months. All parts listed below are NEW.


SHORT VERSION
My Miata is running as if only 2 cylinders are firing. If i remove spark plug wire #1 or #3 the car will continue to run the same, but if i remove #2 or #4 the car immediately dies down. like this guy Currently has OEM ECU and the below parts are BRAND NEW and just installed.

Parts Replaced
ECU Fuse
Fuel Pump
Fuel Filter
Fuel Pressure Regulator
Fuel Injectors
Fuel Pump Relay
Spark Plugs
Spark Plug Wires
Coil Pack
Ignition Switch
Coolant Temperature Sensor (back of motor)
CAS (Cam Angle Sensor in back of motor)
PCV Valve
Throttle Dampening Valve
MAF Box

ANY advise or suggestions welcome!

Thanks,
Mike

 

Just like in the other thread, show your spark plug wires. Coils are paired 1&4, 2&3. Sounds like you've got them 1&3 2&4.

 

damn, i do have it wrong then. If you're standing in front of the car, i have it 3-2-1-4. is there a specific order i need to put or is ok if i just swap 2 and go 3-1-2-4 ?

 

Follow Miata Ignition - and if that doesn't work, swap the pairs, either 1&4 and 2&3 or 2&3 and 1&4 across the coil packs.

 

i must be having the worst luck. tried swapping the spark wire order a few different ways and no luck. Also took a look at the ignition forum you included above, but already did just about all of the suggestions. i guess i'll try and have my friend help me do a compression test because i've never done it before. i'll post the results after.

 

did you buy the MS new?

looks like it's not firing spark B. use the output test mode and try firing Spark A and Spark B.

 

Yea. Bought everything new from goodwin racing and diyautotune

MegaSquirtPNP G2
http://www.good-win-racing.com/Mazda-Performance-Part/61-0342.html

Innovative A/F gauge with O2
http://www.diyautotune.com/catalog/innovate-standalone-gauge-kit-lc2-blue-db-gauge-3795-p-153.html

GM Open Element IAT Sensor
http://www.diyautotune.com/catalog/gm-open-element-iat-sensor-with-pigtail-p-62.html

When you say try firing spark A and B do you mean within the Megasquirt program? I'd have to put the MS back in (currently on stock ecu). Sorry im new to the tuning element.

 

Yes - those settings are under the CAN Bus / Test Mode menu in TunerStudio. If Spark B won't fire, contact us directly at support@diyautotune.com for warranty repair.

 

Ok, so i just re-installed everything (wideband, megasquirt, and IAT. i'm not sure what i am doing wrong, but when i try loading the 91 Miata V3 3.1 base map from MegaSquirtPNP by DIYAutoTune.com i get errors and it says file signatures don't match. (tried the V3 2.5 map also). Here's what i did.

Opened the Tuner Studio and hit "Create new Project"


Then i turned the accessories on and hit "detect" and this popped up.



"Accept"



"Next"



"Next"



"Finish"



"File" - "Open Tune" - Selected the 91 Miata 1.6 "V3 3.1" Tune from MegaSquirtPNP by DIYAutoTune.com


Tried to load it anyway.


Error essage popped up


Error list from map V3 3.1



When i tried the same process with the V3 2.5 map This is the error list popped up.






Here what it looked like when i was cranking the engine (didnt change the IAT settings to the gm yet)


Sorry for the novel just trying to be detailed.

 

cool, now do output test mode and test for spark a and then spark b.

 

ok, Just did the output test mode and all coils had spark.
Coil A - Spark on coils 1 and 4
Coil B - Spark on coils 2 and 3

Have the wires ordered like below (1.6)



Does it matter that when i uploaded the tune i got the error saying the signatures don't match?

 

no.

 

do you have any ideas as to what else i need to do to get this car running???

 

This will sound weird but try pulling the windshield wiper fuse.
I have not figured out why but it corrected a similar situation in my car.

Might not work but it's easy to try

 

Would have been an awesome fix, but no luck

 

Could i possibly be loading the wrong type of file or megasquirt need to be updated?

 

post the msq that's running on the car currently. (i hope youre using that v3.1 basemap)

post a datalog of the car idling on that msq.

 

Here is the file currently on the Megasquirt. (yes i used the V3.1 basemap) but i can't datalog it idling just yet because it just cranks and wont turn over.

 

so what changed? Your first post says running on 2 cylinders but now it says just spins over and doesnt run?

 

sorry just updated the original post. the car now has all the megasquirt stuff back in the car, but it will not fire. it just cranks and i'm not sure what steps to take now.