Notices
PCM Diagnostics & Tuning HP Tuners | Diablo | Pantera EFI

L20/6L80 swap -e38/t43- idle surge in gear SOLVED

 
Old 08-14-2018, 11:42 AM
  #1  
TECH Veteran
Thread Starter
iTrader: (21)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,743
Default L20/6L80 swap -e38/t43- idle surge in gear SOLVED

I think I posted about this before but I'm still at it and not making progress.

I think a big portion of the issue is my lack of understanding about how the e38 works in MAF mode, so I will start at the beginning and hope one of you kind souls takes pity on me.

This motor and trans are 100% stock internally. External bolt ons: a CAI of sorts and the MAF switched to an LS7 card style and the IAT placed in the EGR port. Rear o2's and cats deleted.

I have tried reducing the idle over/under spark advance to steady the idle without much luck.

I have searched for vacuum leaks but it seems to only surge in gear, which is difficult to check for leaks by myself

Any ideas on where to look next?

Last edited by truckdoug; 08-15-2018 at 08:03 PM.
truckdoug is offline  
Old 08-14-2018, 10:08 PM
  #2  
TECH Senior Member
iTrader: (17)
 
smokeshow's Avatar
 
Join Date: Feb 2009
Location: Detroit
Posts: 6,544
Default

As always, post data. Does it still surge a bit but correct itself when you rev in PN? It's likely that you just need to re-calibrate for the new MAF...
smokeshow is offline  
Old 08-15-2018, 11:12 AM
  #3  
TECH Veteran
Thread Starter
iTrader: (21)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,743
Default

right, I should have posted a log and the tune. derp.

yes, it does correct in P/N

I have the maf cells I can get to in park pretty dialed lol but it dies in gear immediately.

it did this surge before we swapped to a ls7 maf. it does it worse now of course since the maf scale is way off.

I'll get a clean log and the tune and a video clip in a few.
truckdoug is offline  
Old 08-15-2018, 11:49 AM
  #4  
LS1Tech Sponsor
iTrader: (4)
 
LSX Power Tuning's Avatar
 
Join Date: Mar 2013
Location: Brenham TX
Posts: 2,191
Default

You should just be able to fix the maf scaling if in maf mode and it will run fine if theirs no mechanical issue.
__________________

Full Service LSX Shop
HP Tuners, EFI Live, SCT, Holley, BS3, FAST XFI
Holley Certified Installer & Tuner
MSD, Brian Tooley, HP Tuners, EFI Live, Holley, Edge, Superchips +100's more

Email, Remote, Mail Order, Dyno, Street & Track Tuning
*WEBPAGE* *FACEBOOK* *ONLINE STORE*

LSX Power Tuning is online now  
Old 08-15-2018, 11:56 AM
  #5  
Teching In
 
mbrown9's Avatar
 
Join Date: Sep 2017
Location: PDX
Posts: 15
Default

i'm posting from my buddies ls1tech log-in and laptop (his laptop and mvpi cable)

here's the tune and a log of several attempts to get it into gear. i'll post a youtube link in a sec when it uploads.

please note the title off the tune is just version 5.3 (not 5.3 liters)
Attached Files
File Type: hpl
mbrown9 is offline  
Old 08-15-2018, 12:10 PM
  #6  
TECH Veteran
Thread Starter
iTrader: (21)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,743
Default

and here's a video of what it's doing.

​​​​​​
truckdoug is offline  
Old 08-15-2018, 08:08 PM
  #7  
TECH Veteran
Thread Starter
iTrader: (21)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 4,743
Default

Originally Posted by LSX Power Tuning View Post
You should just be able to fix the maf scaling if in maf mode and it will run fine if theirs no mechanical issue.

this was it. it wasn't in maf only mode.
truckdoug is offline  

Thread Tools
Search this Thread

About Us - 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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: