EMS4 Idle hunts nonstop - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 06-22-2015, 10:32 PM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default EMS4 Idle hunts nonstop

For about 100 miles I had no issues with idle. I swapped my battery as old one was not holding a charge. I have now gone back to idling at 1100 to 1400 for 10 seconds or so then it surges up to 2000-2300 for a few seconds then back down. It seems to go lean when it goes up to higher rpm. I reloaded a couple of older calibrations with worse results and went back to the last known good calibration. I had it smoked tested with no vac leaks when first having idle issues 3 months back and had the base idle set. Any suggestions would be greatly appreciated.
gthill13 is offline   Reply With Quote
Old 08-18-2015, 10:04 PM   #2
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Still no real resolution. I am definitely getting some noise from the TPS. Was going to try and replace the straight wires with shielded to see if that makes a difference with TPS. Does anyone know of any other fixes that are worth trying to try and improve the TPS signal. I thought I remember someone mentioning some kind of homemade filter.
gthill13 is offline   Reply With Quote
Old 08-19-2015, 12:56 AM   #3
Junior Member
iTrader: (6)
 
Join Date: Feb 2011
Posts: 421
Total Cats: 9
Default

does your tps go to 0%? if so it shouldn't and i would start there.
Twibs415 is offline   Reply With Quote
Old 08-19-2015, 06:22 PM   #4
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
does your tps go to 0%? if so it shouldn't and i would start there.
Not sure, but I will check this weekend once I have some time to screw with it. Thanks
gthill13 is offline   Reply With Quote
Old 08-20-2015, 07:20 PM   #5
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
does your tps go to 0%? if so it shouldn't and i would start there.
I had a chance to check it today and it did go to 0%. At idle it fluctuated between 0 and maybe 2.5%. I also opened the wizard and watched the volts, which registered between 0.49 and 0.55 at idle. Is there setting I can adjust to prevent it from going to 0?
gthill13 is offline   Reply With Quote
Old 08-21-2015, 12:25 AM   #6
Junior Member
iTrader: (6)
 
Join Date: Feb 2011
Posts: 421
Total Cats: 9
Default

its in there somewhere where you can change the min and max voltage. also that is a lot of noise. check your grounds and maybe even add an extra and see if it gets better
Twibs415 is offline   Reply With Quote
Old 08-21-2015, 12:55 AM   #7
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

does your o2 correction swing back and forth wildly? I had a problem with this when the fueling was right in the normal idle cells but off to the sides and it would swing into a shitty loop from the o2 control.
Leafy is offline   Reply With Quote
Old 08-21-2015, 08:14 AM   #8
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
its in there somewhere where you can change the min and max voltage. also that is a lot of noise. check your grounds and maybe even add an extra and see if it gets better
sounds good. Will try another ground.
gthill13 is offline   Reply With Quote
Old 08-21-2015, 08:16 AM   #9
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Leafy View Post
does your o2 correction swing back and forth wildly? I had a problem with this when the fueling was right in the normal idle cells but off to the sides and it would swing into a shitty loop from the o2 control.
I am not using the o2 control function, but the afrs are definitely all over. When the idle shoots up the AFR typically goes to the max on the lean side.
gthill13 is offline   Reply With Quote
Old 08-23-2015, 01:18 AM   #10
Junior Member
iTrader: (6)
 
Join Date: Feb 2011
Posts: 421
Total Cats: 9
Default

have you built a "floor" into the ign and fuel maps?
Twibs415 is offline   Reply With Quote
Old 08-24-2015, 07:41 AM   #11
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
have you built a "floor" into the ign and fuel maps?
Not sure. If I get you my map could you review it?
gthill13 is offline   Reply With Quote
Old 08-25-2015, 11:10 PM   #12
Junior Member
iTrader: (6)
 
Join Date: Feb 2011
Posts: 421
Total Cats: 9
Default

sure
Twibs415 is offline   Reply With Quote
Old 08-26-2015, 02:01 PM   #13
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
sure
Thanks Twibs. The "Mr. Steel" file has a little of fine tuning on the fuel map and the decel was added in. one other potentially related issue I am dealing with is a serious battery drain. Wondering if maybe a short could be causing all the TPS noise. This weekend I hope to find what is causing the power draw
gthill13 is offline   Reply With Quote
Old 08-27-2015, 12:53 AM   #14
Junior Member
iTrader: (6)
 
Join Date: Feb 2011
Posts: 421
Total Cats: 9
Default

first fix your known issues. the drawl cant be good. and then see if you can fix the noise. id expect no more than 1.5% swing in tps. even that much is high.

then set the voltages so tps is always above 0 and below 100 sensors->options tps> set min voltage lower than it is and max voltage higher than it is at wot.

in the actual tune


id back the timing back into idle cells theres no real good reason to be running that much timing at idle. i would also even out your ign vs rpm offset table its skewed to one side. i would also go back into the ignition map and smooth it out. you have a big sudden drop of timing id spread it out over another 1000 rpm so you drop into idle cells gradually. Then retune your fuel to the new ign numbers.

Cheers!
Twibs415 is offline   Reply With Quote
Old 08-27-2015, 08:44 AM   #15
Junior Member
Thread Starter
 
Join Date: Oct 2011
Posts: 97
Total Cats: 0
Default

Quote:
Originally Posted by Twibs415 View Post
first fix your known issues. the drawl cant be good. and then see if you can fix the noise. id expect no more than 1.5% swing in tps. even that much is high.

then set the voltages so tps is always above 0 and below 100 sensors->options tps> set min voltage lower than it is and max voltage higher than it is at wot.

in the actual tune


id back the timing back into idle cells theres no real good reason to be running that much timing at idle. i would also even out your ign vs rpm offset table its skewed to one side. i would also go back into the ignition map and smooth it out. you have a big sudden drop of timing id spread it out over another 1000 rpm so you drop into idle cells gradually. Then retune your fuel to the new ign numbers.

Cheers!
Awesome. Thanks sir. I will let you know how it works out.
gthill13 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
In need of AEM guidance W/pics E=MC^2 AEM 1 09-17-2015 01:34 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 01:35 AM.