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

MS3Pro tuning help... AIC dead?

 
Old 03-17-2019, 09:38 PM
  #1  
Newb
Thread Starter
 
Join Date: Sep 2018
Posts: 19
Total Cats: -1
Default MS3Pro tuning help... AIC dead?

Hi Yall,

1996 miata 1.8 bored over .5 with forged piston and rods, +1mm valves, intake exhaust cam mod, kraken manifold and turbo managed by a brain built ms3pro pnp

Im back. Thanks for all the previous help getting my basemap and fan working. I was finally able to get the car started and driving. I was able to get a bit of autotune and logs.

My current issue:
My AIC valve seems to not function properly, when performing the idle valve test from 0 it will idle at around 700rpm then at 27 steps it will stop raising the idle then will stop raising the idle again at about 47 steps and after that it will keep raising the revs up until around 4k all the way to 100 steps. This presets a problem for me that makes it difficult to start the car when its warm, I have to modulate the throttle a bit and hold the rpms up for about 15 seconds for the car to get into idle. Other wise the car idles well, with fluctiating idle between 14.3-15.0 ish AFR.
Another issue that I ran into was on the highway going about 60 in 5th gear and then suddenly the car started to surge and the AFR went way lean. Then the car died at the pull off ramp and would not start again. It would catch and stall out right away. I was finally able to give it gas and limped back to the shop. At every stop light I had to keep the rpm above 1000 to keep it from stalling. Most of these issues are in the log.

Attached are the log and current tune.

All help and suggestions are greatly appreciated.

Thanks
Attached Files
File Type: msl
2019-03-16_10.18.32.msl (4.68 MB, 5 views)
File Type: msq
2019-03-15_16.25.33.msq (285.1 KB, 6 views)
miatatam8 is offline  
Old 03-18-2019, 09:22 AM
  #2  
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,769
Total Cats: 676
Default

So you have a dead spot from 27-47 you’re saying? That’s most likely a bad idle air valve, but if you’re testing with a steady 700rpm idle and then suddenly it won’t stay running under 1000, it might be a different problem. IAC shouldn’t do anything cruising down the freeway, it’s usually shut, so that’s a different problem. Even if it randomly opened, MS would simply register a change in MAP and follow your fuel map, and the car would accelerate. Not go full lean and try to die.
curly is offline  
Old 03-18-2019, 11:21 AM
  #3  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,399
Total Cats: 2,297
Default

so use 47-100 and close the idle air bypass screw that's ******* up your idle...
Braineack is offline  
Old 03-19-2019, 12:55 PM
  #4  
Newb
Thread Starter
 
Join Date: Sep 2018
Posts: 19
Total Cats: -1
Default

Originally Posted by Braineack View Post
so use 47-100 and close the idle air bypass screw that's ******* up your idle...
I will try that today after work. Thanks
miatatam8 is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
miatatam8
MEGAsquirt
12
02-22-2019 08:31 AM
Zaphod
MEGAsquirt
18
10-09-2014 08:15 AM
RotorNutFD3S
Miata parts for sale/trade
11
02-05-2013 01:32 PM
Uneek719
Miata parts for sale/trade
0
07-20-2011 12:55 PM
Faeflora
General Miata Chat
67
07-26-2010 04:14 PM


Thread Tools
Search this Thread
Quick Reply: MS3Pro tuning help... AIC dead?


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.