Go Back  Miata Turbo Forum - Boost cars, acquire cats. > Performance & Tuning > ECUs and Tuning > MEGAsquirt
Reload this Page >

Troubleshooting MSPNP2 and possible Idle Air Control Valve problem

MEGAsquirt A place to collectively sort out this megasquirt gizmo
Sponsored by:
Sponsored by:

Troubleshooting MSPNP2 and possible Idle Air Control Valve problem

 
Old 08-09-2018, 06:01 PM
  #1  
Newb
Thread Starter
 
Join Date: May 2018
Posts: 6
Total Cats: 1
Default Troubleshooting MSPNP2 and possible Idle Air Control Valve problem

We have been trying to troubleshoot for quite some time a 99 Miata with a FM2 turbo kit that generally runs well but has crazy RPM racing up to 4500 RPMs when it starts. It is tuned to e85. We have taken it to a shop in Chicago area and he is suspecting the Idle Air Control Valve does not work right or there is something faulty about the MegaSquirt. Does this make sense or has anyone else had this experience?
kschaef65 is offline  
Old 08-09-2018, 06:49 PM
  #2  
Elite Member
iTrader: (5)
 
Join Date: Oct 2007
Location: Canton, Ga
Posts: 2,007
Total Cats: 53
Default

Yes. Check the cranking idle DC. Post your MSQ and a log of it happening
Stealth97 is offline  
Old 08-13-2018, 09:04 PM
  #3  
Newb
Thread Starter
 
Join Date: May 2018
Posts: 6
Total Cats: 1
Default

The tuner has solved the surging RPM startup. Dyno-tuned it for 93 octane. A new problem have surfaced in that the idle surges up and down between 1000 RPM and 1200 RPM. Believes there to be a vacuum leak or possibly a boost leak. Anyone had a similar experience with surging idle?

By the way, when I get the car back I will post the tune before and after problem solved so the community can benefit from it. Thanks for your suggestion Stealth97.
kschaef65 is offline  
Old 08-13-2018, 10:28 PM
  #4  
Elite Member
iTrader: (5)
 
Join Date: Oct 2007
Location: Canton, Ga
Posts: 2,007
Total Cats: 53
Default

Originally Posted by kschaef65 View Post
The tuner has solved the surging RPM startup. Dyno-tuned it for 93 octane. A new problem have surfaced in that the idle surges up and down between 1000 RPM and 1200 RPM. Believes there to be a vacuum leak or possibly a boost leak. Anyone had a similar experience with surging idle?

By the way, when I get the car back I will post the tune before and after problem solved so the community can benefit from it. Thanks for your suggestion Stealth97.
before you go hunting leaks, make sure the cells in the idle portion of your spark table are all the same- Differences here can make idle jump around.
Stealth97 is offline  
Old 08-17-2018, 12:31 PM
  #5  
Moderator
iTrader: (12)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 18,913
Total Cats: 2,364
Default

Originally Posted by Stealth97 View Post
before you go hunting leaks, make sure the cells in the idle portion of your spark table are all the same- Differences here can make idle jump around.
This
sixshooter is online now  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Patriarca
General Miata Chat
0
10-14-2015 12:37 PM
Rafa
WTB
8
12-06-2012 12:31 PM
GrahamC
DIY Turbo Discussion
4
04-25-2011 11:33 AM
falcon
MEGAsquirt
20
12-27-2010 02:40 PM
Thucydides
MEGAsquirt
7
11-08-2010 08:05 PM


Thread Tools
Search this Thread
Quick Reply: Troubleshooting MSPNP2 and possible Idle Air Control Valve problem


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 Amazon.com and affiliated sites.