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

Oscillating AFR at Idle with AC

 
Old 10-22-2018, 09:18 PM
  #1  
Junior Member
Thread Starter
 
Join Date: May 2011
Location: Miami
Posts: 183
Total Cats: 14
Default Oscillating AFR at Idle with AC

Hello everybody.
Cutting straight to the point, I have my afr's at idle pretty rock stable at 14.7 when warmed up. When I turn the ac on things seem to get wonky. I am attaching a short length datalog at idle as well as my latest tunerstudio tune. Would anyone have any idea as to why my afr's seem to be erratic when my ac is on?
For reference, my car is a 92 on a ms3pnppro and I have it converted to sequential fuel and I am running Nigel's 380cc flowforce injectors. I honestly don't remember if I had this issue before I switched to Nigels injectors and using ac. Since upgrading to his ev14 injectors my entire fuel map has had to be redone.

For all times relevant to the data log, the throttle pedal was not touched.

Last edited by andym; 10-22-2018 at 09:43 PM.
andym is offline  
Old 10-22-2018, 09:20 PM
  #2  
Junior Member
Thread Starter
 
Join Date: May 2011
Location: Miami
Posts: 183
Total Cats: 14
Default

Here are the files.
Attached Files
File Type: msq
Andy 2.871 (114whp).msq (256.1 KB, 7 views)
File Type: msl
idle with ac wonky afr.msl (274.5 KB, 7 views)
andym is offline  
Old 10-22-2018, 11:42 PM
  #3  
Junior Member
Thread Starter
 
Join Date: May 2011
Location: Miami
Posts: 183
Total Cats: 14
Default

I think I fixed the issue. I removed the intermediate harness I made for my TPS and went back to the stock chassis harness and re calibrated in tuner studio my vtps. Problem went away. I think I might have flipped my +5 and ref wires. Will investigate that in the future.
andym is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
elior77
MEGAsquirt
11
11-05-2014 03:15 PM
Impuls
MEGAsquirt
2
10-12-2013 08:22 PM
mc85
Engine Performance
8
06-23-2013 12:45 AM
Enginerd
MSPNP
25
06-24-2011 07:36 AM
pdexta
MEGAsquirt
6
07-22-2010 06:12 PM


Thread Tools
Search this Thread
Quick Reply: Oscillating AFR at Idle with AC


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.