Car starts, runs for about 5 seconds then dies - 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 04-07-2014, 04:50 PM   #1
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default Car starts, runs for about 5 seconds then dies

Hey guys. I have a 1992 miata 1.6. 550cc injectors, and a MTX-l wideband with a MS3 built by Rev. I got everything wired up recently and im trying to get the car to idle so I can set the timing. The car fires with a pop usually and idles fine for a second then the AFR starts climbing and the car starts to die. Any ideas? Heres a datalog
Attached Files
File Type: msl 2014-04-07_16.19.03.msl (100.3 KB, 38 views)

Last edited by Fatvod; 04-07-2014 at 05:20 PM.
Fatvod is offline   Reply With Quote
Old 04-07-2014, 05:05 PM   #2
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

Some tables
Fuel:

Spark:

AFR:
Attached Thumbnails
Car starts, runs for about 5 seconds then dies-9d6mtzt.png   Car starts, runs for about 5 seconds then dies-xpcmj64.png   Car starts, runs for about 5 seconds then dies-lymtipb.png  
Fatvod is offline   Reply With Quote
Old 04-07-2014, 05:14 PM   #3
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

And a picture of attempted idle
Attached Thumbnails
Car starts, runs for about 5 seconds then dies-l0chwvg.jpg  
Fatvod is offline   Reply With Quote
Old 04-07-2014, 05:31 PM   #4
Senior Member
iTrader: (3)
 
Join Date: Apr 2011
Location: Volo, IL
Posts: 1,247
Total Cats: 140
Default

From the manual:


Afterstart Enrichment: If the engine tries to start, but dies right away, you need to adjust the after start enrichment. Generally this should be between 25-45% for 100 to 250 cycles,
Warmup Enrichment: If the engine starts but dies after a several seconds or minutes, then you need to adjust your warm-up enrichment. Use up to 15% greater than the defaults if that seems to help.
VE Table: Adjust the values at the idle kPa and rpm to get it to idle. You want to change the VE table entries while watching the engine MAP (in kPa) to try and lower the MAP as much as possible. Do this after the engine has warmed up. As you do this, the engine rpm will rise, and you may have to adjust the throttle stop on the throttle body to lower the rpm back to the desired idle speed. Once the idle VE are tuned, you will have to retune the afterstart and warmup enrichments.
dieselmiata is offline   Reply With Quote
Old 04-07-2014, 06:16 PM   #5
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

Aha! I can get the car to idle now, but it jumps around and wont sit still.

Last edited by Fatvod; 04-07-2014 at 08:26 PM.
Fatvod is offline   Reply With Quote
Old 04-07-2014, 06:32 PM   #6
Senior Member
iTrader: (3)
 
Join Date: Apr 2011
Location: Volo, IL
Posts: 1,247
Total Cats: 140
Default

Are you using autotune to tune your idle?
dieselmiata is offline   Reply With Quote
Old 04-07-2014, 06:50 PM   #7
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

I was trying to yes, should I not?
Fatvod is offline   Reply With Quote
Old 04-07-2014, 06:55 PM   #8
Senior Member
iTrader: (3)
 
Join Date: Apr 2011
Location: Volo, IL
Posts: 1,247
Total Cats: 140
Default

No, you shouldn't. Never use auto tune for idle.
dieselmiata is offline   Reply With Quote
Old 04-07-2014, 06:58 PM   #9
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

Ah okay, didnt know. Ill try tuning the idle myself.
Fatvod is offline   Reply With Quote
Old 04-07-2014, 08:13 PM   #10
Junior Member
Thread Starter
 
Join Date: Dec 2013
Posts: 54
Total Cats: -3
Default

Got it figured out, thanks.

Last edited by Fatvod; 04-18-2014 at 11:54 AM.
Fatvod is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
91 1.6l turbo complete part out. Tony the Tiger Miata parts for sale/trade 63 12-29-2016 03:23 AM
DIYPNP Won't Stay Running huesmann MEGAsquirt 19 09-16-2015 08:11 PM
Ms2e 99-00 ac control Dobzeh MEGAsquirt 23 09-15-2015 05:49 PM
VE values too low? compuw22c MEGAsquirt 4 09-12-2015 08:42 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 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 01:03 AM.