Lean idle, when hot start. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 05-27-2013, 10:07 PM   #1
Junior Member
Thread Starter
 
Join Date: Jul 2011
Posts: 84
Total Cats: 2
Default Lean idle, when hot start.

Hi, iv'ed been messing aroung with reverant ms3x a bit, tunning is going well, Idle VE is setup. PID seems to be decently tuned, And EGO Correction is set at 15% starting at 20kpa.

Cold or mid start, everything is fine, runs fine even after a good run. Stop it and after a short amount of time(5-15min), idles goes crazy lean, Then after a few minutes, everything is back to normal. Then i still get lite lean peaks at red lights and stops(15-15.5A/F).

Anyway suggestion on where or what to look at?

Log attached. Lean idle to normal.
IAC seems to be alot higher, so i guest i get to much air in, wich is weird because engine speed is kind of stable!
Attached Files
File Type: msl 2013-05-27_18.19.02.msl (247.2 KB, 72 views)
sr20det_28 is offline   Reply With Quote
Old 05-28-2013, 01:16 AM   #2
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

Where is your temp sensor located? This seems like the normal case of heat soaked air temp sensor.
triple88a is offline   Reply With Quote
Old 05-28-2013, 07:21 PM   #3
Junior Member
iTrader: (1)
 
Join Date: Apr 2011
Posts: 119
Total Cats: 1
Default

Quote:
Originally Posted by triple88a View Post
Where is your temp sensor located? This seems like the normal case of heat soaked air temp sensor.
My car has similar issues. In hot weather it idles lean and a little rough. It's located between the alternator and radiator in aluminum pipe. What's the best place for it?
event is offline   Reply With Quote
Old 05-28-2013, 07:48 PM   #4
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

Right after the intercooler. Your problem is different. Your problem is the air temp correction. Its set to lean out too much with temp increase. You gotta change the values. His problem is when he shuts off the car the sensor temp increases because he no longer has air flowing through the piping and it heats up so when he starts the car back up the sensor is too hot and doesnt give enough fuel.
triple88a is offline   Reply With Quote
Old 05-28-2013, 11:21 PM   #5
Junior Member
Thread Starter
 
Join Date: Jul 2011
Posts: 84
Total Cats: 2
Default

Quote:
Originally Posted by triple88a View Post
Where is your temp sensor located? This seems like the normal case of heat soaked air temp sensor.
At the exact same place as event, you suggest changing MAT sensor location would fix this? or just live with it?
sr20det_28 is offline   Reply With Quote
Old 05-28-2013, 11:49 PM   #6
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

It would definitely help and at the very least make it so the sensor cools down faster while u start moving so u'll be back to normal and idling at good temp faster.
triple88a is offline   Reply With Quote
Old 05-29-2013, 08:02 AM   #7
Junior Member
Thread Starter
 
Join Date: Jul 2011
Posts: 84
Total Cats: 2
Default

I'm going to try that! as soon as i find myself a welder -_-, Thanks man!!!!
sr20det_28 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:59 AM.