Forum Register TCG Mobile Casino Live Posting Feed Garage Arcade Members List Calendar Search Today's Posts Mark Forums Read
Go Back   The Chicago Garage > The Garage > Automotive Discussions > 3800 Discussion

User Tag List

Like Tree9Likes
  • 2 Post By b4black
  • 2 Post By Turbocharged400sbc
  • 1 Post By Turbocharged400sbc
  • 4 Post By boostedguy05

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 06-05-2018, 08:46 PM   #1
 
TurboTPI's Avatar
 
Join Date: Jan 2018
Location: Bensenville, Il
Posts: 92
Casino cash: $1315000
0.17 per day
Default Weird fuel trim problem

So my car (2001 Regal GS) has this really strange issue. It runs extremely rich during light load driving for the first 5 mins of driving. It will be between 10:1 - 12:1 unless i accelerate at like 25% throttle or more. It is in closed loop when it does this. Long term fuel trims will be 10% or more, short term trims will be in positive also and o2 voltage will be around 900mV. So the ecm knows its unning rich but it keeps adding fuel. Then after about 5min, its straightens out and fuel trims go to + - 5% like normal and a/f ratio is normal up and down between 14:1 - 15.5:1. Its not in open loop during this issue, its in cosed loop. And if i turn the car off and start it back up right away, it will do it again for another 5min about. Anyone ever seen anything like that before?
__________________
01 Buick Regal GS-Daily Driver, "bolt ons"
92 Firebird Formula 350- slow turbo TPI street car
TurboTPI is offline   Reply With Quote
Old 06-05-2018, 09:18 PM   #2
 
GTPpower's Avatar
 
Join Date: Jun 2012
Location: Nebraska
Posts: 2,054
Casino cash: $24433500
0.79 per day
Default

Did you remove the cat? Sounds like it's doing the cat test to me.
__________________
05 F350 6.0 - studded, deleted, updated, tuned
01 GTP - Slicks/Skinnies/Nitrous/Stock Trans - [email protected] Sold
66 442 Vert - Needs work
01 GTP Race Car
GTPpower is offline   Reply With Quote
Old 06-05-2018, 11:26 PM   #3
 
TurboTPI's Avatar
 
Join Date: Jan 2018
Location: Bensenville, Il
Posts: 92
Casino cash: $1315000
0.17 per day
Default

i have a high flow cat, but i have all the rear o2 codes turned off and dont even have the rear o2 plugged in. Can that cause my issue?
TurboTPI is offline   Reply With Quote
Old 06-06-2018, 06:09 AM   #4
 
b4black's Avatar
 
Join Date: Jun 2008
Location: Oswego
Posts: 1,042
Casino cash: $18250000
0.26 per day
Default

I'd second the cat test. Try plugging the rear sensor in. The quicker the test pass or fails, the sooner it is done. I had a dead sensor (set to not report a MIL) and the test just kept running and running. Drove me nuts until I installed a new sensor.
GTPpower and TurboTPI like this.
__________________
2013 Lincoln MKS 3.5 Ecoboost
2002 Buick Regal GS (Sold-3800 Alumnus)
1996 Dodge Ram - Cummins 12 Valve - 4x4
1982 Buick Grand National x2
1965 Hemi Barracuda - Richard Petty's 43 JR drag car
b4black is offline   Reply With Quote
Old 06-06-2018, 07:03 AM   #5
 
GTPpower's Avatar
 
Join Date: Jun 2012
Location: Nebraska
Posts: 2,054
Casino cash: $24433500
0.79 per day
Default

Yeah, put the sensor back in and see if you notice a difference.
GTPpower is offline   Reply With Quote
Old 06-06-2018, 08:40 AM   #6
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.00 per day
Default

its 6 passes or 6 fails before the cat test state is put into the OBD2 readiness monitors as pass/fail

in tiny youll find the cat test can run up to 16 times per drive....without setting it to 0 all datalog data is questionable although larger datalogs mitigate the effects somewhat.

setting to not enabled is a workaround but needs to be enabled/not reported to do what needs done....if ya know what i mean....every year/2 years
boostedguy05 and TurboTPI like this.
__________________
Double D Racing: Over-engineered and under-funded
Schlimbuilt: 32 orders of magnitude above "good enough"
https://drive.google.com/file/d/15tJ...ew?usp=sharing
04 GTP clone, a nice heap
84 Cressida waGN 3800jz-gte swapped scrap pile
68 F250 camper special 390fe/np435/d60...EFI 460/5spd ZF someday
94 Olds 442 (462ci-4wd-2 engines) new chassis underway... L67/4t80e^[email protected]
Quote:
Originally Posted by Wolfman View Post
3800>all other technology ever
Turbocharged400sbc is offline   Reply With Quote
Old 06-06-2018, 08:46 AM   #7
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.00 per day
Default

also keep in mind the evap/purge system functions play havoc with trims
boostedguy05 likes this.
Turbocharged400sbc is offline   Reply With Quote
Old 06-06-2018, 08:55 AM   #8
. .
 
boostedguy05's Avatar
 
Join Date: Dec 2010
Posts: 20,596
Casino cash: $23723000
6.57 per day
Default

And like our own 3800 batman, when needed, James comes out of the shadows to help those in need.
__________________
Quote:
Originally Posted by Mike K View Post
You're either a barely functioning idiot or you're a brilliant genius. I must study you.
boostedguy05 is online now   Reply With Quote
Old 06-06-2018, 09:02 AM   #9
 
TurboTPI's Avatar
 
Join Date: Jan 2018
Location: Bensenville, Il
Posts: 92
Casino cash: $1315000
0.17 per day
Default

Thanks guys. Ill put the sensor back in and see what happens. All my EVAP stuff is still on and functioning, so that shouldnt be part of the problem.
TurboTPI is offline   Reply With Quote
Old 06-07-2018, 08:48 AM   #10
Welllllllllll ya knowwwwwww.....
 
Turbocharged400sbc's Avatar
 
Join Date: Jun 2007
Location: hangover park IL
Posts: 26,499
Casino cash: $46588000
6.00 per day
Default

if functional it will be contributing to odd trims
Turbocharged400sbc is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

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



All times are GMT -5. The time now is 09:16 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging v3.0.6 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
no new posts