ITB mspnp2 way too lean - Miata Turbo Forum - Boost cars, acquire cats.

MSPNP MSPNP specific Megasquirt related discussion.
Sponsored by:
Sponsored by:

ITB mspnp2 way too lean

Old 04-27-2016, 07:23 PM
  #1  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default 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
Attached Files
File Type: msq
ITBwhitemiata90.msq (108.5 KB, 125 views)
AdoboMiata is offline  
Old 04-27-2016, 07:27 PM
  #2  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default

We also calibrated the o2 sensor, tps -- also changed the accel settings to 100% TPS, and IAT
AdoboMiata is offline  
Old 04-27-2016, 09:25 PM
  #3  
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,445
Total Cats: 1,618
Default

22.4 is the max setting for the MTX-L. Usually means an error. Or a giant exhaust leak.

Is the sensor in the header?

And plugged in?

Is it all wired correctly?
aidandj is offline  
Old 04-28-2016, 05:24 PM
  #4  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default

Originally Posted by aidandj View Post
22.4 is the max setting for the MTX-L. Usually means an error. Or a giant exhaust leak.

Is the sensor in the header?

And plugged in?

Is it all wired correctly?
From the ecu, it's the red/blue wire yes?

I recalibrated the o2 sensor and still doing the samething. hm...
AdoboMiata is offline  
Old 04-28-2016, 05:35 PM
  #5  
VladiTuned
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 35,078
Total Cats: 3,113
Default

are all the injectors actually firing?
18psi is offline  
Old 04-28-2016, 05:35 PM
  #6  
Senior Member
iTrader: (1)
 
Join Date: Dec 2010
Location: Farmington Hills, MI
Posts: 1,118
Total Cats: 146
Default

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.
acedeuce802 is offline  
Old 04-28-2016, 05:55 PM
  #7  
Senior Member
 
mmmjesse's Avatar
 
Join Date: Aug 2007
Posts: 568
Total Cats: 43
Default

in my brief experience, you would have a poorly running car if you were that lean. Your sensor or gauge are most definately off. i am assuming MS is showing about the same reading? Is this a brand new wideband unit?
mmmjesse is offline  
Old 04-28-2016, 06:51 PM
  #8  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default

Originally Posted by acedeuce802 View Post
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.
Originally Posted by 18psi View Post
are all the injectors actually firing?
Yes, definitely not a misfire and the plugs are wet.
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...

Originally Posted by mmmjesse View Post
in my brief experience, you would have a poorly running car if you were that lean. Your sensor or gauge are most definately off. i am assuming MS is showing about the same reading? Is this a brand new wideband unit?
I'm starting to think this wideband is defected

AdoboMiata is offline  
Old 04-29-2016, 12:22 AM
  #9  
Senior Member
iTrader: (1)
 
Join Date: Dec 2010
Location: Farmington Hills, MI
Posts: 1,118
Total Cats: 146
Default

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.
acedeuce802 is offline  
Old 04-29-2016, 01:01 AM
  #10  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default

Originally Posted by acedeuce802 View Post
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.
My mistake, I did not repost my update on time. I actually used the yellow wire and left the brown wrapped away. Isn't white just the dimmer? Anyways, I tried to calibrate the o2 sensor again hoping that would be the problem but failed. Still reads 22.4 (so is megasquirt). hmph. It really seems like it's a faulty sensor.

edit -- grounded the white wire still 22.4

Last edited by AdoboMiata; 04-29-2016 at 01:52 AM.
AdoboMiata is offline  
Old 04-29-2016, 09:11 AM
  #11  
Senior Member
iTrader: (1)
 
Join Date: Dec 2010
Location: Farmington Hills, MI
Posts: 1,118
Total Cats: 146
Default

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.
acedeuce802 is offline  
Old 04-29-2016, 01:40 PM
  #12  
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Dec 2011
Posts: 380
Total Cats: -17
Default

Originally Posted by acedeuce802 View Post
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.
Yes, my friend bought it new. We have a spare wideband. I'm going to try and test that out.
AdoboMiata is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
FocusTI
Miata parts for sale/trade
16
05-13-2016 11:15 PM
ESamett
EcuFlash
3
04-29-2016 10:54 AM
Rshannon81
MEGAsquirt
13
04-25-2016 09:43 PM
vincentrx7
MEGAsquirt
4
04-22-2016 02:49 PM


Thread Tools
Search this Thread
Quick Reply: ITB mspnp2 way too lean


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.