Supercharger Discussion For all you misguided souls.
Sponsored by:
Sponsored by:

Fault code P2187 on Cosworth supercharged NC

Old 08-04-2016, 07:59 PM
Thread Starter
Join Date: Oct 2010
Posts: 9
Total Cats: 0
Default Fault code P2187 on Cosworth supercharged NC

I've got a 2006 NC with Cosworth supercharger. and I'm getting fault code P2187 System Too Lean at Idle (Bank 1).

I've had this fault code occasionally ever since I bought the car a year a go. No other fault codes.

However, it's now started to occur most days so is getting a bit annoying

Car runs great, just get a 'miss' every minute or so when idling; the idle suddenly drops but then catches itself.

The front O2 sensor was changed by the previous owner 18 months ago (in an attempt to fix this fault I would suspect). I've just changed the purge valve and solenoid as apparently these can cause this code.

Has anyone else had this fault code on their NC?
trashy is offline  
Old 08-07-2016, 11:23 PM
Join Date: Jul 2015
Location: South Central TN
Posts: 15
Total Cats: 0

Do you have a wideband to see what is going on? Or any sort of datalongging system? If you are getting CEL codes, you must still have a stock ECU.
PSS is offline  
Old 08-08-2016, 06:54 PM
Thread Starter
Join Date: Oct 2010
Posts: 9
Total Cats: 0


At the weekend I used the Torque Android App and a bluetooth OBD2 reader to get some freeze frame info when idling. It looks like I have Short Term Fuel Trim (STFT) of nearly 18% and Long Term Fuel Trim (LTFT) or over 20%. This seems high to me and possibly the cause of the fault code if the trims max out (25% each) before they can get the fueling rich enough,

Freeze frame information:
Fuel Status = 0 byte
Engine Load = 11.765 %
Engine Coolant Temperature = 83 C
Fuel Trim Bank 1 Short Term = 17.969 %
Fuel Trim Bank 1 Long Term = 20.312 %

Intake Manifold Pressure = 4.206 psi
Engine RPM = 747 rpm
Speed (OBD) = 0 km/h
Timing Advance = 3.5
Intake Air Temperature = 45 C
Mass Air Flow Rate = 1.59 g/s
Throttle Position(Manifold) = 10.588 %
Run time since engine start = 30 s
EGR Commanded = 0 %
Distance travelled since codes cleared = 9 km
Barometric pressure (from vehicle) = 14.794 psi
Catalyst Temperature (Bank 1,Sensor 1) = 404.6 C
Voltage (Control Module) = 13.407 V
Engine Load(Absolute) = 12.157 %
Commanded Equivalence Ratio(lambda) = 0.998
Relative Throttle Position = 1.569 %
Absolute Throttle Position B = 10.588 %
Accelerator PedalPosition D = 31.373 %
Accelerator PedalPosition E = 20.784 %
trashy is offline  
Old 08-08-2016, 07:58 PM
iTrader: (76)
18psi's Avatar
Join Date: Apr 2008
Posts: 35,186
Total Cats: 3,166

find the vacuum/boost leak
18psi is offline  
Related Topics
Thread Starter
Last Post
Meet and Greet
02-07-2017 06:02 AM
General Miata Chat
06-29-2016 12:14 PM
Fab9 Tuning - Miata Performance Parts
05-20-2016 01:03 PM
General Miata Chat
02-15-2009 05:16 AM

Thread Tools
Search this Thread
Quick Reply: Fault code P2187 on Cosworth supercharged NC

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 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 and affiliated sites.