ITB mspnp2 way too lean
#1
ITB mspnp2 way too lean
Hey MiataTurbo Members, this is my first time tuning an ITB engine and it is running a unusual. We were trying to set the base timing (by following the instructions on Megasquirt manual) but TunerStudio and our wideband is showing 22.4. Car starts up fine but idles at a high rpm (1k-3k). We tried adjusting the timing to see if it would run rich but there was no difference in AFR's. We also tried to add more fuel in the VE tables but the car would only rev higher and still run lean.. I will attach the MSQ.
I'm used to base mapping turbo cars (like my own) or nearly stock miata's but never dealt with ITBs.
1.8 engine in a 1.6 Chassis (1990)
CAS
Maruha ITB
Racing Beat headers, test pipe, and muffler
Toyota Coil on plugs
Innovate MTX-L
IAT sensor
Deatschewerks 200 Fuel pump
NB Red top Injectors
I'm used to base mapping turbo cars (like my own) or nearly stock miata's but never dealt with ITBs.
1.8 engine in a 1.6 Chassis (1990)
CAS
Maruha ITB
Racing Beat headers, test pipe, and muffler
Toyota Coil on plugs
Innovate MTX-L
IAT sensor
Deatschewerks 200 Fuel pump
NB Red top Injectors
#6
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Yes red/blue for signal, as long as your MSPNP2 is configured for reading wideband off the factory pin at 2N. But, that doesn't matter for your situation. All the MTX-L needs is power and ground for the gauge to work properly. Obviously you're getting power, otherwise it would not read anything. It could be a faulty unit. Where are you getting power and ground from?
If it's running at least fairly healthy, I'm sure it's below 22.4, and that would be a sensor error.
If it's running at least fairly healthy, I'm sure it's below 22.4, and that would be a sensor error.
#8
Yes red/blue for signal, as long as your MSPNP2 is configured for reading wideband off the factory pin at 2N. But, that doesn't matter for your situation. All the MTX-L needs is power and ground for the gauge to work properly. Obviously you're getting power, otherwise it would not read anything. It could be a faulty unit. Where are you getting power and ground from?
If it's running at least fairly healthy, I'm sure it's below 22.4, and that would be a sensor error.
If it's running at least fairly healthy, I'm sure it's below 22.4, and that would be a sensor error.
I rewired everything and will be calibrating again.
This is what I have so far: Wideband -> Harness
Power -> Cigarette wire (red/blue)
Ground -> back of head
Yellow -> red/blue from ecu
Brown -> red/blue from ecu
white - wrrapped away
MS is now reading o2 but the gauge still showing 22.4 (weiiiird...) It is idling at 2k rpm and everytime I add fuel in the VE the rpms increase. hm...
#9
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Join Date: Dec 2010
Location: Farmington Hills, MI
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Why do you have both outputs going to red/blue? Yellow is analog output 1, use that. Brown is unused unless you're sending it to another logger/stock ECU or something. White should be grounded if you're not using it.
#10
edit -- grounded the white wire still 22.4
Last edited by AdoboMiata; 04-29-2016 at 12:52 AM.
#11
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iTrader: (1)
Join Date: Dec 2010
Location: Farmington Hills, MI
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Ah, yeah I believe the white wire is just for the dimmer. I just remembered grounding it on mine. Yeah, I'd put in a call to Innovate. Hopefully you bought it new so you can get support.
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